X86FloatingPoint.cpp revision 88835735f49c3fce20698a72898df83bd84bd1cd
191b5ca838ac74ba7756a49b569684f1889cae8afMisha Brukman//===-- X86FloatingPoint.cpp - Floating point Reg -> Stack converter ------===// 20e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 5b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// This file was developed by the LLVM research group and is distributed under 6b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 70e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 9a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// 10a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// This file defines the pass which converts floating point instructions from 11847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// virtual registers into register stack instructions. This pass uses live 12847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// variable information to indicate where the FPn registers are used and their 13847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// lifetimes. 14847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// 15847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// This pass is hampered by the lack of decent CFG manipulation routines for 16847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// machine code. In particular, this wants to be able to split critical edges 17847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// as necessary, traverse the machine basic block CFG in depth-first order, and 18847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// allow there to be multiple machine basic blocks for each LLVM basicblock 19847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// (needed for critical edge splitting). 20847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// 21847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// In particular, this pass currently barfs on critical edges. Because of this, 22847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// it requires the instruction selector to insert FP_REG_KILL instructions on 23847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// the exits of any basic block that has critical edges going from it, or which 24847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// branch to a critical basic block. 25847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// 26847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// FIXME: this is not implemented yet. The stackifier pass only works on local 27847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner// basic blocks. 28a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// 29a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 30a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 3195b2c7da5e83670881270c1cd231a240be0556d9Chris Lattner#define DEBUG_TYPE "x86-codegen" 32a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "X86.h" 33a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "X86InstrInfo.h" 34a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "llvm/CodeGen/MachineFunctionPass.h" 35a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "llvm/CodeGen/MachineInstrBuilder.h" 36a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "llvm/CodeGen/LiveVariables.h" 37359b65f782cc323daba4f8c5c21c70a98c9d40eaAlkis Evlogimenos#include "llvm/CodeGen/Passes.h" 383501feab811c86c9659248a4875fc31a3165f84dChris Lattner#include "llvm/Target/TargetInstrInfo.h" 39a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include "llvm/Target/TargetMachine.h" 40551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/Debug.h" 41a4f0b3a084d120cfc5b5bb06f64b222f5cb72740Chris Lattner#include "llvm/Support/Compiler.h" 42551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/DepthFirstIterator.h" 43ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng#include "llvm/ADT/SmallVector.h" 44551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/Statistic.h" 45551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/STLExtras.h" 46a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#include <algorithm> 47847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner#include <set> 48f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattnerusing namespace llvm; 49d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 5095b2c7da5e83670881270c1cd231a240be0556d9Chris LattnerSTATISTIC(NumFXCH, "Number of fxch instructions inserted"); 5195b2c7da5e83670881270c1cd231a240be0556d9Chris LattnerSTATISTIC(NumFP , "Number of floating point instructions"); 52a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 5395b2c7da5e83670881270c1cd231a240be0556d9Chris Lattnernamespace { 542c79de8018bb8c77a245d4ccb740affbf1f52319Chris Lattner struct VISIBILITY_HIDDEN FPS : public MachineFunctionPass { 551997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patel static char ID; 56794fd75c67a2cdc128d67342c6d88a504d186896Devang Patel FPS() : MachineFunctionPass((intptr_t)&ID) {} 57794fd75c67a2cdc128d67342c6d88a504d186896Devang Patel 58a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner virtual bool runOnMachineFunction(MachineFunction &MF); 59a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 60a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner virtual const char *getPassName() const { return "X86 FP Stackifier"; } 61a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 62a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner virtual void getAnalysisUsage(AnalysisUsage &AU) const { 63a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner AU.addRequired<LiveVariables>(); 64a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner MachineFunctionPass::getAnalysisUsage(AU); 65a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 66a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner private: 6732644ac67ce25a06c8c6658746911479d56a894fEvan Cheng const TargetInstrInfo *TII; // Machine instruction info. 6832644ac67ce25a06c8c6658746911479d56a894fEvan Cheng LiveVariables *LV; // Live variable info for current function... 6932644ac67ce25a06c8c6658746911479d56a894fEvan Cheng MachineBasicBlock *MBB; // Current basic block 7032644ac67ce25a06c8c6658746911479d56a894fEvan Cheng unsigned Stack[8]; // FP<n> Registers in each stack slot... 7132644ac67ce25a06c8c6658746911479d56a894fEvan Cheng unsigned RegMap[8]; // Track which stack slot contains each register 7232644ac67ce25a06c8c6658746911479d56a894fEvan Cheng unsigned StackTop; // The current top of the FP stack. 73a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 74a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void dumpStack() const { 75f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling cerr << "Stack contents:"; 76a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner for (unsigned i = 0; i != StackTop; ++i) { 77f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling cerr << " FP" << Stack[i]; 780e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman assert(RegMap[Stack[i]] == i && "Stack[] doesn't match RegMap[]!"); 79a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 80f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling cerr << "\n"; 81a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 82a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner private: 83a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // getSlot - Return the stack slot number a particular register number is 84a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // in... 85a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned getSlot(unsigned RegNo) const { 86a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(RegNo < 8 && "Regno out of range!"); 87a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return RegMap[RegNo]; 88a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 89a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 90a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // getStackEntry - Return the X86::FP<n> register in register ST(i) 91a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned getStackEntry(unsigned STi) const { 92a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(STi < StackTop && "Access past stack top!"); 93a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return Stack[StackTop-1-STi]; 94a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 95a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 96a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // getSTReg - Return the X86::ST(i) register which contains the specified 97a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // FP<RegNo> register 98a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned getSTReg(unsigned RegNo) const { 99d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke return StackTop - 1 - getSlot(RegNo) + llvm::X86::ST0; 100a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 101a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1024a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // pushReg - Push the specified FP<n> register onto the stack 103a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void pushReg(unsigned Reg) { 104a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(Reg < 8 && "Register number out of range!"); 105a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop < 8 && "Stack overflow!"); 106a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner Stack[StackTop] = Reg; 107a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner RegMap[Reg] = StackTop++; 108a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 109a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 110a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner bool isAtTop(unsigned RegNo) const { return getSlot(RegNo) == StackTop-1; } 111a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void moveToTop(unsigned RegNo, MachineBasicBlock::iterator &I) { 112a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (!isAtTop(RegNo)) { 1130e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman unsigned STReg = getSTReg(RegNo); 1140e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman unsigned RegOnTop = getStackEntry(0); 115a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1160e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman // Swap the slots the regs are in 1170e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman std::swap(RegMap[RegNo], RegMap[RegOnTop]); 118a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1190e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman // Swap stack slot contents 1200e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman assert(RegMap[RegOnTop] < StackTop); 1210e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman std::swap(Stack[RegMap[RegOnTop]], Stack[StackTop-1]); 122a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1230e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman // Emit an fxch to update the runtime processors version of the state 124e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen BuildMI(*MBB, I, TII->get(X86::XCH_F)).addReg(STReg); 1250e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman NumFXCH++; 126a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 127a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 128a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1290526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner void duplicateToTop(unsigned RegNo, unsigned AsReg, MachineInstr *I) { 130a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned STReg = getSTReg(RegNo); 131a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner pushReg(AsReg); // New register on top of stack 132a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 133e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen BuildMI(*MBB, I, TII->get(X86::LD_Frr)).addReg(STReg); 134a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 135a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 136a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // popStackAfter - Pop the current value off of the top of the FP stack 137a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // after the specified instruction. 138a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void popStackAfter(MachineBasicBlock::iterator &I); 139a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 1400526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // freeStackSlotAfter - Free the specified register from the register stack, 1410526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // so that it is no longer in a register. If the register is currently at 1420526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // the top of the stack, we just pop the current instruction, otherwise we 1430526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // store the current top-of-stack into the specified slot, then pop the top 1440526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // of stack. 1450526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner void freeStackSlotAfter(MachineBasicBlock::iterator &I, unsigned Reg); 1460526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner 147a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner bool processBasicBlock(MachineFunction &MF, MachineBasicBlock &MBB); 148a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 149a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void handleZeroArgFP(MachineBasicBlock::iterator &I); 150a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void handleOneArgFP(MachineBasicBlock::iterator &I); 1514a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner void handleOneArgFPRW(MachineBasicBlock::iterator &I); 152a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void handleTwoArgFP(MachineBasicBlock::iterator &I); 153d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner void handleCompareFP(MachineBasicBlock::iterator &I); 154c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner void handleCondMovFP(MachineBasicBlock::iterator &I); 155a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner void handleSpecialFP(MachineBasicBlock::iterator &I); 156a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner }; 1571997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patel char FPS::ID = 0; 158a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 159a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 160f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris LattnerFunctionPass *llvm::createX86FloatingPointStackifierPass() { return new FPS(); } 161a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 162a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// runOnMachineFunction - Loop over all of the basic blocks, transforming FP 163a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// register references into FP stack references. 164a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// 165a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerbool FPS::runOnMachineFunction(MachineFunction &MF) { 16642e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner // We only need to run this pass if there are any FP registers used in this 16742e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner // function. If it is all integer, there is nothing for us to do! 16842e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner bool FPIsUsed = false; 16942e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner 17042e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner assert(X86::FP6 == X86::FP0+6 && "Register enums aren't sorted right!"); 17142e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner for (unsigned i = 0; i <= 6; ++i) 1726c087e5585b227f3c1d8278304c7cfbc7cd4f6e8Evan Cheng if (MF.isPhysRegUsed(X86::FP0+i)) { 17342e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner FPIsUsed = true; 17442e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner break; 17542e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner } 17642e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner 17742e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner // Early exit. 17842e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner if (!FPIsUsed) return false; 17942e25b387f9bbae463ddd739c16e4fdc81abb371Chris Lattner 18032644ac67ce25a06c8c6658746911479d56a894fEvan Cheng TII = MF.getTarget().getInstrInfo(); 181a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner LV = &getAnalysis<LiveVariables>(); 182a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner StackTop = 0; 183a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 184847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner // Process the function in depth first order so that we process at least one 185847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner // of the predecessors for every reachable block in the function. 1862268684f6fef2ef7e5b523d21dbd376f09ec1174Chris Lattner std::set<MachineBasicBlock*> Processed; 1872268684f6fef2ef7e5b523d21dbd376f09ec1174Chris Lattner MachineBasicBlock *Entry = MF.begin(); 188847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner 189847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner bool Changed = false; 1902268684f6fef2ef7e5b523d21dbd376f09ec1174Chris Lattner for (df_ext_iterator<MachineBasicBlock*, std::set<MachineBasicBlock*> > 191847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner I = df_ext_begin(Entry, Processed), E = df_ext_end(Entry, Processed); 192847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner I != E; ++I) 1932268684f6fef2ef7e5b523d21dbd376f09ec1174Chris Lattner Changed |= processBasicBlock(MF, **I); 194847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner 195a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return Changed; 196a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 197a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 198a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// processBasicBlock - Loop over all of the instructions in the basic block, 199a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// transforming FP instructions into their stack form. 200a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// 201a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerbool FPS::processBasicBlock(MachineFunction &MF, MachineBasicBlock &BB) { 202a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner bool Changed = false; 203a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner MBB = &BB; 2040e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman 205a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner for (MachineBasicBlock::iterator I = BB.begin(); I != BB.end(); ++I) { 206c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 20712a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng unsigned Flags = MI->getInstrDescriptor()->TSFlags; 208847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner if ((Flags & X86II::FPTypeMask) == X86II::NotFP) 209847df25e7d8876c8a93ff4e4cc72c8f73ed50dbbChris Lattner continue; // Efficiently ignore non-fp insts! 210a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 211c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *PrevMI = 0; 212f81af21caf9c0f62c60b72762d9a927e8c24f679Alkis Evlogimenos if (I != BB.begin()) 213f81af21caf9c0f62c60b72762d9a927e8c24f679Alkis Evlogimenos PrevMI = prior(I); 214a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 215a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner ++NumFP; // Keep track of # of pseudo instrs 216c5f8e4f13406c86785069839c1edfb86ae767e63Chris Lattner DOUT << "\nFPInst:\t" << *MI; 217a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 218a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Get dead variables list now because the MI pointer may be deleted as part 219a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // of processing! 220ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng SmallVector<unsigned, 8> DeadRegs; 221ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 222ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng const MachineOperand &MO = MI->getOperand(i); 223ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng if (MO.isReg() && MO.isDead()) 224ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng DeadRegs.push_back(MO.getReg()); 225ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng } 226a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 227a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner switch (Flags & X86II::FPTypeMask) { 2284a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner case X86II::ZeroArgFP: handleZeroArgFP(I); break; 229c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner case X86II::OneArgFP: handleOneArgFP(I); break; // fstp ST(0) 2304a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner case X86II::OneArgFPRW: handleOneArgFPRW(I); break; // ST(0) = fsqrt(ST(0)) 2315cd3e9f4b7caa5a79c6c05633b11144d0ae41771Evan Cheng case X86II::TwoArgFP: handleTwoArgFP(I); break; 232ab8deccb82460527562d1c36a787537e4edaa9ddChris Lattner case X86II::CompareFP: handleCompareFP(I); break; 233c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner case X86II::CondMovFP: handleCondMovFP(I); break; 2344a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner case X86II::SpecialFP: handleSpecialFP(I); break; 235a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner default: assert(0 && "Unknown FP Type!"); 236a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 237a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 238a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Check to see if any of the values defined by this instruction are dead 239a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // after definition. If so, pop them. 240ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng for (unsigned i = 0, e = DeadRegs.size(); i != e; ++i) { 241ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng unsigned Reg = DeadRegs[i]; 242a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (Reg >= X86::FP0 && Reg <= X86::FP6) { 243f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling DOUT << "Register FP#" << Reg-X86::FP0 << " is dead!\n"; 244d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner freeStackSlotAfter(I, Reg-X86::FP0); 245a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 246a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 2470e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman 248a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Print out all of the instructions expanded to if -debug 249b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos DEBUG( 250b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos MachineBasicBlock::iterator PrevI(PrevMI); 251b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos if (I == PrevI) { 252f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling cerr << "Just deleted pseudo instruction\n"; 253b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos } else { 254b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos MachineBasicBlock::iterator Start = I; 255b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos // Rewind to first instruction newly inserted. 256b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos while (Start != BB.begin() && prior(Start) != PrevI) --Start; 257f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling cerr << "Inserted instructions:\n\t"; 258f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8Bill Wendling Start->print(*cerr.stream(), &MF.getTarget()); 259b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos while (++Start != next(I)); 260b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos } 261b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos dumpStack(); 262b929bca0279869b2b9649463318a68988302c0ceAlkis Evlogimenos ); 263a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 264a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner Changed = true; 265a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 266a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 267a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop == 0 && "Stack not empty at end of basic block?"); 268a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return Changed; 269a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 270a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 271a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 272a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// Efficient Lookup Table Support 273a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 274a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 275f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattnernamespace { 276f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner struct TableEntry { 277f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner unsigned from; 278f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner unsigned to; 279f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner bool operator<(const TableEntry &TE) const { return from < TE.from; } 2809471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen friend bool operator<(const TableEntry &TE, unsigned V) { 2819471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen return TE.from < V; 2829471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen } 2839471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen friend bool operator<(unsigned V, const TableEntry &TE) { 2849471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen return V < TE.from; 2859471c8a93b117d8ac01c4ef1cb9faa583e03dec0Jeff Cohen } 286f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner }; 287f2e49d4c1a8839f30e8ca9617139d63db173fa80Chris Lattner} 288a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 289a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic bool TableIsSorted(const TableEntry *Table, unsigned NumEntries) { 290a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner for (unsigned i = 0; i != NumEntries-1; ++i) 291a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (!(Table[i] < Table[i+1])) return false; 292a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return true; 293a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 294a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 295a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic int Lookup(const TableEntry *Table, unsigned N, unsigned Opcode) { 296a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner const TableEntry *I = std::lower_bound(Table, Table+N, Opcode); 297a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (I != Table+N && I->from == Opcode) 298a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return I->to; 299a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return -1; 300a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 301a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 302a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#define ARRAY_SIZE(TABLE) \ 303a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner (sizeof(TABLE)/sizeof(TABLE[0])) 304a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 305a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#ifdef NDEBUG 306a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#define ASSERT_SORTED(TABLE) 307a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#else 308a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#define ASSERT_SORTED(TABLE) \ 309a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner { static bool TABLE##Checked = false; \ 310c06fe8a5ac41ff407af25395f58d15c650f5b266Jim Laskey if (!TABLE##Checked) { \ 311a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(TableIsSorted(TABLE, ARRAY_SIZE(TABLE)) && \ 312a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner "All lookup tables must be sorted for efficient access!"); \ 313c06fe8a5ac41ff407af25395f58d15c650f5b266Jim Laskey TABLE##Checked = true; \ 314c06fe8a5ac41ff407af25395f58d15c650f5b266Jim Laskey } \ 315a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 316a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner#endif 317a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 31858fe459e36605342410e8c11d12ee1901428b14bChris Lattner//===----------------------------------------------------------------------===// 31958fe459e36605342410e8c11d12ee1901428b14bChris Lattner// Register File -> Register Stack Mapping Methods 32058fe459e36605342410e8c11d12ee1901428b14bChris Lattner//===----------------------------------------------------------------------===// 32158fe459e36605342410e8c11d12ee1901428b14bChris Lattner 32258fe459e36605342410e8c11d12ee1901428b14bChris Lattner// OpcodeTable - Sorted map of register instructions to their stack version. 32358fe459e36605342410e8c11d12ee1901428b14bChris Lattner// The first element is an register file pseudo instruction, the second is the 32458fe459e36605342410e8c11d12ee1901428b14bChris Lattner// concrete X86 instruction which uses the register stack. 32558fe459e36605342410e8c11d12ee1901428b14bChris Lattner// 32658fe459e36605342410e8c11d12ee1901428b14bChris Lattnerstatic const TableEntry OpcodeTable[] = { 327e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ABS_Fp32 , X86::ABS_F }, 328e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ABS_Fp64 , X86::ABS_F }, 32959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ABS_Fp80 , X86::ABS_F }, 330afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::ADD_Fp32m , X86::ADD_F32m }, 331afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::ADD_Fp64m , X86::ADD_F64m }, 332afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::ADD_Fp64m32 , X86::ADD_F32m }, 33359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ADD_Fp80m32 , X86::ADD_F32m }, 33459a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ADD_Fp80m64 , X86::ADD_F64m }, 335e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_FpI16m32 , X86::ADD_FI16m }, 336e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_FpI16m64 , X86::ADD_FI16m }, 33759a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ADD_FpI16m80 , X86::ADD_FI16m }, 338e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_FpI32m32 , X86::ADD_FI32m }, 339e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_FpI32m64 , X86::ADD_FI32m }, 34059a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ADD_FpI32m80 , X86::ADD_FI32m }, 341e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CHS_Fp32 , X86::CHS_F }, 342e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CHS_Fp64 , X86::CHS_F }, 34359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CHS_Fp80 , X86::CHS_F }, 344e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVBE_Fp32 , X86::CMOVBE_F }, 345e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVBE_Fp64 , X86::CMOVBE_F }, 34659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVBE_Fp80 , X86::CMOVBE_F }, 347e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVB_Fp32 , X86::CMOVB_F }, 348e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVB_Fp64 , X86::CMOVB_F }, 34959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVB_Fp80 , X86::CMOVB_F }, 350e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVE_Fp32 , X86::CMOVE_F }, 351e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVE_Fp64 , X86::CMOVE_F }, 35259a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVE_Fp80 , X86::CMOVE_F }, 353e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNBE_Fp32 , X86::CMOVNBE_F }, 354e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNBE_Fp64 , X86::CMOVNBE_F }, 35559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVNBE_Fp80 , X86::CMOVNBE_F }, 356e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNB_Fp32 , X86::CMOVNB_F }, 357e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNB_Fp64 , X86::CMOVNB_F }, 35859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVNB_Fp80 , X86::CMOVNB_F }, 359e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNE_Fp32 , X86::CMOVNE_F }, 360e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNE_Fp64 , X86::CMOVNE_F }, 36159a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVNE_Fp80 , X86::CMOVNE_F }, 362e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNP_Fp32 , X86::CMOVNP_F }, 363e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVNP_Fp64 , X86::CMOVNP_F }, 36459a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVNP_Fp80 , X86::CMOVNP_F }, 365e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVP_Fp32 , X86::CMOVP_F }, 366e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::CMOVP_Fp64 , X86::CMOVP_F }, 36759a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::CMOVP_Fp80 , X86::CMOVP_F }, 368e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::COS_Fp32 , X86::COS_F }, 369e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::COS_Fp64 , X86::COS_F }, 37059a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::COS_Fp80 , X86::COS_F }, 371e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_Fp32m , X86::DIVR_F32m }, 372e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_Fp64m , X86::DIVR_F64m }, 373afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::DIVR_Fp64m32 , X86::DIVR_F32m }, 37459a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIVR_Fp80m32 , X86::DIVR_F32m }, 37559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIVR_Fp80m64 , X86::DIVR_F64m }, 376e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_FpI16m32, X86::DIVR_FI16m}, 377e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_FpI16m64, X86::DIVR_FI16m}, 37859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIVR_FpI16m80, X86::DIVR_FI16m}, 379e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_FpI32m32, X86::DIVR_FI32m}, 380e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_FpI32m64, X86::DIVR_FI32m}, 38159a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIVR_FpI32m80, X86::DIVR_FI32m}, 382e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp32m , X86::DIV_F32m }, 383e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp64m , X86::DIV_F64m }, 384afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::DIV_Fp64m32 , X86::DIV_F32m }, 38559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIV_Fp80m32 , X86::DIV_F32m }, 38659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIV_Fp80m64 , X86::DIV_F64m }, 387e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_FpI16m32 , X86::DIV_FI16m }, 388e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_FpI16m64 , X86::DIV_FI16m }, 38959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIV_FpI16m80 , X86::DIV_FI16m }, 390e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_FpI32m32 , X86::DIV_FI32m }, 391e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_FpI32m64 , X86::DIV_FI32m }, 39259a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::DIV_FpI32m80 , X86::DIV_FI32m }, 393e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp16m32 , X86::ILD_F16m }, 394e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp16m64 , X86::ILD_F16m }, 39559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ILD_Fp16m80 , X86::ILD_F16m }, 396e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp32m32 , X86::ILD_F32m }, 397e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp32m64 , X86::ILD_F32m }, 39859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ILD_Fp32m80 , X86::ILD_F32m }, 399e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp64m32 , X86::ILD_F64m }, 400e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ILD_Fp64m64 , X86::ILD_F64m }, 40159a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ILD_Fp64m80 , X86::ILD_F64m }, 402e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp16m32 , X86::ISTT_FP16m}, 403e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp16m64 , X86::ISTT_FP16m}, 404e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp32m32 , X86::ISTT_FP32m}, 405e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp32m64 , X86::ISTT_FP32m}, 406e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp64m32 , X86::ISTT_FP64m}, 407e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ISTT_Fp64m64 , X86::ISTT_FP64m}, 408e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp16m32 , X86::IST_F16m }, 409e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp16m64 , X86::IST_F16m }, 41059a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::IST_Fp16m80 , X86::IST_F16m }, 411e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp32m32 , X86::IST_F32m }, 412e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp32m64 , X86::IST_F32m }, 41359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::IST_Fp32m80 , X86::IST_F32m }, 414e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp64m32 , X86::IST_FP64m }, 415e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_Fp64m64 , X86::IST_FP64m }, 41659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::IST_Fp64m80 , X86::IST_FP64m }, 417e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp032 , X86::LD_F0 }, 418e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp064 , X86::LD_F0 }, 41959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::LD_Fp080 , X86::LD_F0 }, 420e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp132 , X86::LD_F1 }, 421e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp164 , X86::LD_F1 }, 42259a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::LD_Fp180 , X86::LD_F1 }, 423e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp32m , X86::LD_F32m }, 424e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::LD_Fp64m , X86::LD_F64m }, 42559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::LD_Fp80m , X86::LD_F80m }, 426e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp32m , X86::MUL_F32m }, 427e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp64m , X86::MUL_F64m }, 428afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::MUL_Fp64m32 , X86::MUL_F32m }, 42959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::MUL_Fp80m32 , X86::MUL_F32m }, 43059a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::MUL_Fp80m64 , X86::MUL_F64m }, 431e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_FpI16m32 , X86::MUL_FI16m }, 432e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_FpI16m64 , X86::MUL_FI16m }, 43359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::MUL_FpI16m80 , X86::MUL_FI16m }, 434e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_FpI32m32 , X86::MUL_FI32m }, 435e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_FpI32m64 , X86::MUL_FI32m }, 43659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::MUL_FpI32m80 , X86::MUL_FI32m }, 437e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SIN_Fp32 , X86::SIN_F }, 438e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SIN_Fp64 , X86::SIN_F }, 43959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SIN_Fp80 , X86::SIN_F }, 440e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SQRT_Fp32 , X86::SQRT_F }, 441e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SQRT_Fp64 , X86::SQRT_F }, 44259a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SQRT_Fp80 , X86::SQRT_F }, 443e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_Fp32m , X86::ST_F32m }, 444e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_Fp64m , X86::ST_F64m }, 445e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_Fp64m32 , X86::ST_F32m }, 44659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ST_Fp80m32 , X86::ST_F32m }, 44759a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ST_Fp80m64 , X86::ST_F64m }, 44859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::ST_FpP80m , X86::ST_FP80m }, 449e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_Fp32m , X86::SUBR_F32m }, 450e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_Fp64m , X86::SUBR_F64m }, 451afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::SUBR_Fp64m32 , X86::SUBR_F32m }, 45259a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUBR_Fp80m32 , X86::SUBR_F32m }, 45359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUBR_Fp80m64 , X86::SUBR_F64m }, 454e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_FpI16m32, X86::SUBR_FI16m}, 455e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_FpI16m64, X86::SUBR_FI16m}, 45659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUBR_FpI16m80, X86::SUBR_FI16m}, 457e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_FpI32m32, X86::SUBR_FI32m}, 458e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_FpI32m64, X86::SUBR_FI32m}, 45959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUBR_FpI32m80, X86::SUBR_FI32m}, 460e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp32m , X86::SUB_F32m }, 461e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp64m , X86::SUB_F64m }, 462afdc7fda65953c0444671dd3e3ce98f5097c1a20Dale Johannesen { X86::SUB_Fp64m32 , X86::SUB_F32m }, 46359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUB_Fp80m32 , X86::SUB_F32m }, 46459a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUB_Fp80m64 , X86::SUB_F64m }, 465e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_FpI16m32 , X86::SUB_FI16m }, 466e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_FpI16m64 , X86::SUB_FI16m }, 46759a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUB_FpI16m80 , X86::SUB_FI16m }, 468e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_FpI32m32 , X86::SUB_FI32m }, 469e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_FpI32m64 , X86::SUB_FI32m }, 47059a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::SUB_FpI32m80 , X86::SUB_FI32m }, 471e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::TST_Fp32 , X86::TST_F }, 472e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::TST_Fp64 , X86::TST_F }, 47359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::TST_Fp80 , X86::TST_F }, 474e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_FpIr32 , X86::UCOM_FIr }, 475e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_FpIr64 , X86::UCOM_FIr }, 47659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::UCOM_FpIr80 , X86::UCOM_FIr }, 477e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_Fpr32 , X86::UCOM_Fr }, 478e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_Fpr64 , X86::UCOM_Fr }, 47959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen { X86::UCOM_Fpr80 , X86::UCOM_Fr }, 48058fe459e36605342410e8c11d12ee1901428b14bChris Lattner}; 48158fe459e36605342410e8c11d12ee1901428b14bChris Lattner 48258fe459e36605342410e8c11d12ee1901428b14bChris Lattnerstatic unsigned getConcreteOpcode(unsigned Opcode) { 48358fe459e36605342410e8c11d12ee1901428b14bChris Lattner ASSERT_SORTED(OpcodeTable); 48458fe459e36605342410e8c11d12ee1901428b14bChris Lattner int Opc = Lookup(OpcodeTable, ARRAY_SIZE(OpcodeTable), Opcode); 48558fe459e36605342410e8c11d12ee1901428b14bChris Lattner assert(Opc != -1 && "FP Stack instruction not in OpcodeTable!"); 48658fe459e36605342410e8c11d12ee1901428b14bChris Lattner return Opc; 48758fe459e36605342410e8c11d12ee1901428b14bChris Lattner} 488a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 489a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 490a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// Helper Methods 491a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 492a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 493a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// PopTable - Sorted map of instructions to their popping version. The first 494a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// element is an instruction, the second is the version which pops. 495a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// 496a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic const TableEntry PopTable[] = { 497e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_FrST0 , X86::ADD_FPrST0 }, 498113455be9d69f881165abafb6b6b0dd5b4b54aa8Chris Lattner 499e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIVR_FrST0, X86::DIVR_FPrST0 }, 500e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_FrST0 , X86::DIV_FPrST0 }, 501113455be9d69f881165abafb6b6b0dd5b4b54aa8Chris Lattner 502e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_F16m , X86::IST_FP16m }, 503e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::IST_F32m , X86::IST_FP32m }, 504113455be9d69f881165abafb6b6b0dd5b4b54aa8Chris Lattner 505e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_FrST0 , X86::MUL_FPrST0 }, 506113455be9d69f881165abafb6b6b0dd5b4b54aa8Chris Lattner 507e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_F32m , X86::ST_FP32m }, 508e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_F64m , X86::ST_FP64m }, 509e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ST_Frr , X86::ST_FPrr }, 510a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 511e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUBR_FrST0, X86::SUBR_FPrST0 }, 512e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_FrST0 , X86::SUB_FPrST0 }, 513a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 514e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_FIr , X86::UCOM_FIPr }, 515c040bca4b9dfaa58cbc0c00f1cc435e3251332ecChris Lattner 516e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_FPr , X86::UCOM_FPPr }, 517e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::UCOM_Fr , X86::UCOM_FPr }, 518a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner}; 519a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 520a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// popStackAfter - Pop the current value off of the top of the FP stack after 521a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// the specified instruction. This attempts to be sneaky and combine the pop 522a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// into the instruction itself if possible. The iterator is left pointing to 523a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// the last instruction, be it a new pop instruction inserted, or the old 524a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// instruction if it was modified in place. 525a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// 526a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnervoid FPS::popStackAfter(MachineBasicBlock::iterator &I) { 527a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner ASSERT_SORTED(PopTable); 528a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop > 0 && "Cannot pop empty stack!"); 529a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner RegMap[Stack[--StackTop]] = ~0; // Update state 530a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 531a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Check to see if there is a popping version of this instruction... 532c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos int Opcode = Lookup(PopTable, ARRAY_SIZE(PopTable), I->getOpcode()); 533a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (Opcode != -1) { 53412a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng I->setInstrDescriptor(TII->get(Opcode)); 535e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen if (Opcode == X86::UCOM_FPPr) 536c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos I->RemoveOperand(0); 537a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else { // Insert an explicit pop 538e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen I = BuildMI(*MBB, ++I, TII->get(X86::ST_FPrr)).addReg(X86::ST0); 539a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 540a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 541a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 5420526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner/// freeStackSlotAfter - Free the specified register from the register stack, so 5430526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner/// that it is no longer in a register. If the register is currently at the top 5440526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner/// of the stack, we just pop the current instruction, otherwise we store the 5450526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner/// current top-of-stack into the specified slot, then pop the top of stack. 5460526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattnervoid FPS::freeStackSlotAfter(MachineBasicBlock::iterator &I, unsigned FPRegNo) { 5470526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner if (getStackEntry(0) == FPRegNo) { // already at the top of stack? easy. 5480526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner popStackAfter(I); 5490526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner return; 5500526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner } 5510526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner 5520526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // Otherwise, store the top of stack into the dead slot, killing the operand 5530526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // without having to add in an explicit xchg then pop. 5540526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner // 5550526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner unsigned STReg = getSTReg(FPRegNo); 5560526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner unsigned OldSlot = getSlot(FPRegNo); 5570526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner unsigned TopReg = Stack[StackTop-1]; 5580526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner Stack[OldSlot] = TopReg; 5590526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner RegMap[TopReg] = OldSlot; 5600526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner RegMap[FPRegNo] = ~0; 5610526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner Stack[--StackTop] = ~0; 562e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen I = BuildMI(*MBB, ++I, TII->get(X86::ST_FPrr)).addReg(STReg); 5630526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner} 5640526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner 5650526f01fec0945eca49ccd91f22a93af6bb71c17Chris Lattner 566a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic unsigned getFPReg(const MachineOperand &MO) { 5676d2151871889a4d4c22a0883a8ee667333f1cb0bChris Lattner assert(MO.isRegister() && "Expected an FP register!"); 568a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned Reg = MO.getReg(); 569a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!"); 570a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner return Reg - X86::FP0; 571a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 572a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 573a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 574a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 575a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// Instruction transformation implementation 576a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 577a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 578a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// handleZeroArgFP - ST(0) = fld0 ST(0) = flds <mem> 5794a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner/// 580a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnervoid FPS::handleZeroArgFP(MachineBasicBlock::iterator &I) { 581c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 582a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned DestReg = getFPReg(MI->getOperand(0)); 583a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 58458fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Change from the pseudo instruction to the concrete instruction. 58558fe459e36605342410e8c11d12ee1901428b14bChris Lattner MI->RemoveOperand(0); // Remove the explicit ST(0) operand 58612a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng MI->setInstrDescriptor(TII->get(getConcreteOpcode(MI->getOpcode()))); 58758fe459e36605342410e8c11d12ee1901428b14bChris Lattner 58858fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Result gets pushed on the stack. 589a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner pushReg(DestReg); 590a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 591a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 5924a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner/// handleOneArgFP - fst <mem>, ST(0) 5934a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner/// 594a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnervoid FPS::handleOneArgFP(MachineBasicBlock::iterator &I) { 595c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 59612a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng unsigned NumOps = MI->getInstrDescriptor()->numOperands; 597171d09ea537ac272091a1a2560302074b144fccaEvan Cheng assert((NumOps == 5 || NumOps == 1) && 598b97046ae4f5979df9fea20216fef0fe67211e0c6Chris Lattner "Can only handle fst* & ftst instructions!"); 599a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 6004a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // Is this the last use of the source register? 601171d09ea537ac272091a1a2560302074b144fccaEvan Cheng unsigned Reg = getFPReg(MI->getOperand(NumOps-1)); 60276eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg); 603a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 6042b1527157116ba6045667eb29568f2f460d7b670Evan Cheng // FISTP64m is strange because there isn't a non-popping versions. 605a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // If we have one _and_ we don't want to pop the operand, duplicate the value 606a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // on the stack instead of moving it. This ensure that popping the value is 607a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // always ok. 6082b1527157116ba6045667eb29568f2f460d7b670Evan Cheng // Ditto FISTTP16m, FISTTP32m, FISTTP64m. 609a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // 6102b1527157116ba6045667eb29568f2f460d7b670Evan Cheng if (!KillsSrc && 611e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen (MI->getOpcode() == X86::IST_Fp64m32 || 612e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_Fp16m32 || 613e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_Fp32m32 || 614e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_Fp64m32 || 615e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::IST_Fp64m64 || 616e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_Fp16m64 || 617e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_Fp32m64 || 61859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen MI->getOpcode() == X86::ISTT_Fp64m64 || 61959a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen MI->getOpcode() == X86::ST_FpP80m)) { 620a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner duplicateToTop(Reg, 7 /*temp register*/, I); 621a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else { 622a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner moveToTop(Reg, I); // Move to the top of the stack... 623a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 62458fe459e36605342410e8c11d12ee1901428b14bChris Lattner 62558fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Convert from the pseudo instruction to the concrete instruction. 626171d09ea537ac272091a1a2560302074b144fccaEvan Cheng MI->RemoveOperand(NumOps-1); // Remove explicit ST(0) operand 62712a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng MI->setInstrDescriptor(TII->get(getConcreteOpcode(MI->getOpcode()))); 6280e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman 629e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen if (MI->getOpcode() == X86::IST_FP64m || 630e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_FP16m || 631e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen MI->getOpcode() == X86::ISTT_FP32m || 63288835735f49c3fce20698a72898df83bd84bd1cdDale Johannesen MI->getOpcode() == X86::ISTT_FP64m || 63388835735f49c3fce20698a72898df83bd84bd1cdDale Johannesen MI->getOpcode() == X86::ST_FP80m) { 634a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop > 0 && "Stack empty??"); 635a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner --StackTop; 636a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else if (KillsSrc) { // Last use of operand? 637a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner popStackAfter(I); 638a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 639a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 640a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 6414a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 6424cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// handleOneArgFPRW: Handle instructions that read from the top of stack and 6434cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// replace the value with a newly computed value. These instructions may have 6444cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// non-fp operands after their FP operands. 6454cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// 6464cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// Examples: 6474cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// R1 = fchs R2 6484cf15e7a3bed2ff3a7fa87f18cdf65b7eecccee2Chris Lattner/// R1 = fadd R2, [mem] 6494a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner/// 6504a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattnervoid FPS::handleOneArgFPRW(MachineBasicBlock::iterator &I) { 651c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 65212a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng unsigned NumOps = MI->getInstrDescriptor()->numOperands; 653171d09ea537ac272091a1a2560302074b144fccaEvan Cheng assert(NumOps >= 2 && "FPRW instructions must have 2 ops!!"); 6544a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 6554a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // Is this the last use of the source register? 6564a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner unsigned Reg = getFPReg(MI->getOperand(1)); 65776eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg); 6584a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 6594a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner if (KillsSrc) { 6604a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // If this is the last use of the source register, just make sure it's on 6614a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // the top of the stack. 6624a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner moveToTop(Reg, I); 6634a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner assert(StackTop > 0 && "Stack cannot be empty!"); 6644a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner --StackTop; 6654a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner pushReg(getFPReg(MI->getOperand(0))); 6664a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner } else { 6674a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // If this is not the last use of the source register, _copy_ it to the top 6684a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner // of the stack. 6694a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner duplicateToTop(Reg, getFPReg(MI->getOperand(0)), I); 6704a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner } 6714a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 67258fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Change from the pseudo instruction to the concrete instruction. 6734a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner MI->RemoveOperand(1); // Drop the source operand. 6744a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner MI->RemoveOperand(0); // Drop the destination operand. 67512a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng MI->setInstrDescriptor(TII->get(getConcreteOpcode(MI->getOpcode()))); 6764a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner} 6774a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 6784a06f354843117df344d7b0aacc7114d50d38fe9Chris Lattner 679a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner//===----------------------------------------------------------------------===// 680a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// Define tables of various ways to map pseudo instructions 681a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// 682a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 683a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// ForwardST0Table - Map: A = B op C into: ST(0) = ST(0) op ST(i) 684a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic const TableEntry ForwardST0Table[] = { 685e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp32 , X86::ADD_FST0r }, 686e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp64 , X86::ADD_FST0r }, 687e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp32 , X86::DIV_FST0r }, 688e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp64 , X86::DIV_FST0r }, 689e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp32 , X86::MUL_FST0r }, 690e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp64 , X86::MUL_FST0r }, 691e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp32 , X86::SUB_FST0r }, 692e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp64 , X86::SUB_FST0r }, 693a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner}; 694a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 695a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// ReverseST0Table - Map: A = B op C into: ST(0) = ST(i) op ST(0) 696a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic const TableEntry ReverseST0Table[] = { 697e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp32 , X86::ADD_FST0r }, // commutative 698e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp64 , X86::ADD_FST0r }, // commutative 699e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp32 , X86::DIVR_FST0r }, 700e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp64 , X86::DIVR_FST0r }, 701e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp32 , X86::MUL_FST0r }, // commutative 702e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp64 , X86::MUL_FST0r }, // commutative 703e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp32 , X86::SUBR_FST0r }, 704e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp64 , X86::SUBR_FST0r }, 705a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner}; 706a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 707a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// ForwardSTiTable - Map: A = B op C into: ST(i) = ST(0) op ST(i) 708a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic const TableEntry ForwardSTiTable[] = { 709e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp32 , X86::ADD_FrST0 }, // commutative 710e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp64 , X86::ADD_FrST0 }, // commutative 711e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp32 , X86::DIVR_FrST0 }, 712e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp64 , X86::DIVR_FrST0 }, 713e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp32 , X86::MUL_FrST0 }, // commutative 714e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp64 , X86::MUL_FrST0 }, // commutative 715e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp32 , X86::SUBR_FrST0 }, 716e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp64 , X86::SUBR_FrST0 }, 717a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner}; 718a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 719a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner// ReverseSTiTable - Map: A = B op C into: ST(i) = ST(i) op ST(0) 720a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnerstatic const TableEntry ReverseSTiTable[] = { 721e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp32 , X86::ADD_FrST0 }, 722e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::ADD_Fp64 , X86::ADD_FrST0 }, 723e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp32 , X86::DIV_FrST0 }, 724e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::DIV_Fp64 , X86::DIV_FrST0 }, 725e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp32 , X86::MUL_FrST0 }, 726e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::MUL_Fp64 , X86::MUL_FrST0 }, 727e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp32 , X86::SUB_FrST0 }, 728e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen { X86::SUB_Fp64 , X86::SUB_FrST0 }, 729a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner}; 730a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 731a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 732a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// handleTwoArgFP - Handle instructions like FADD and friends which are virtual 733a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// instructions which need to be simplified and possibly transformed. 734a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// 735a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// Result: ST(0) = fsub ST(0), ST(i) 736a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// ST(i) = fsub ST(0), ST(i) 737a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// ST(0) = fsubr ST(0), ST(i) 738a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// ST(i) = fsubr ST(0), ST(i) 7390e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman/// 740a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnervoid FPS::handleTwoArgFP(MachineBasicBlock::iterator &I) { 741a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner ASSERT_SORTED(ForwardST0Table); ASSERT_SORTED(ReverseST0Table); 742a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner ASSERT_SORTED(ForwardSTiTable); ASSERT_SORTED(ReverseSTiTable); 743c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 744a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 74512a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng unsigned NumOperands = MI->getInstrDescriptor()->numOperands; 746d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner assert(NumOperands == 3 && "Illegal TwoArgFP instruction!"); 747a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned Dest = getFPReg(MI->getOperand(0)); 748a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2)); 749a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1)); 75076eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0); 75176eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1); 752a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 753a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned TOS = getStackEntry(0); 754a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 755a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // One of our operands must be on the top of the stack. If neither is yet, we 756a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // need to move one. 757a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (Op0 != TOS && Op1 != TOS) { // No operand at TOS? 758a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // We can choose to move either operand to the top of the stack. If one of 759a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // the operands is killed by this instruction, we want that one so that we 760a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // can update right on top of the old version. 761a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (KillsOp0) { 762a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner moveToTop(Op0, I); // Move dead operand to TOS. 763a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner TOS = Op0; 764a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else if (KillsOp1) { 765a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner moveToTop(Op1, I); 766a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner TOS = Op1; 767a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else { 768a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // All of the operands are live after this instruction executes, so we 769a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // cannot update on top of any operand. Because of this, we must 770a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // duplicate one of the stack elements to the top. It doesn't matter 771a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // which one we pick. 772a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // 773a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner duplicateToTop(Op0, Dest, I); 774a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner Op0 = TOS = Dest; 775a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner KillsOp0 = true; 776a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 777d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner } else if (!KillsOp0 && !KillsOp1) { 778a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // If we DO have one of our operands at the top of the stack, but we don't 779a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // have a dead operand, we must duplicate one of the operands to a new slot 780a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // on the stack. 781a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner duplicateToTop(Op0, Dest, I); 782a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner Op0 = TOS = Dest; 783a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner KillsOp0 = true; 784a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 785a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 786a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Now we know that one of our operands is on the top of the stack, and at 787a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // least one of our operands is killed by this instruction. 7880e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman assert((TOS == Op0 || TOS == Op1) && (KillsOp0 || KillsOp1) && 7890e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman "Stack conditions not set up right!"); 790a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 791a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // We decide which form to use based on what is on the top of the stack, and 792a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // which operand is killed by this instruction. 793a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner const TableEntry *InstTable; 794a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner bool isForward = TOS == Op0; 795a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner bool updateST0 = (TOS == Op0 && !KillsOp1) || (TOS == Op1 && !KillsOp0); 796a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (updateST0) { 797a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (isForward) 798a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner InstTable = ForwardST0Table; 799a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner else 800a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner InstTable = ReverseST0Table; 801a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else { 802a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (isForward) 803a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner InstTable = ForwardSTiTable; 804a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner else 805a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner InstTable = ReverseSTiTable; 806a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 8070e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman 808a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner int Opcode = Lookup(InstTable, ARRAY_SIZE(ForwardST0Table), MI->getOpcode()); 809a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(Opcode != -1 && "Unknown TwoArgFP pseudo instruction!"); 810a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 811a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // NotTOS - The register which is not on the top of stack... 812a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned NotTOS = (TOS == Op0) ? Op1 : Op0; 813a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 814a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Replace the old instruction with a new instruction 815c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner MBB->remove(I++); 81612a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng I = BuildMI(*MBB, I, TII->get(Opcode)).addReg(getSTReg(NotTOS)); 817a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 818a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // If both operands are killed, pop one off of the stack in addition to 819a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // overwriting the other one. 820a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner if (KillsOp0 && KillsOp1 && Op0 != Op1) { 821a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(!updateST0 && "Should have updated other operand!"); 822a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner popStackAfter(I); // Pop the top of stack 823a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 824a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 825a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // Update stack information so that we know the destination register is now on 826a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // the stack. 827d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner unsigned UpdatedSlot = getSlot(updateST0 ? TOS : NotTOS); 828d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner assert(UpdatedSlot < StackTop && Dest < 7); 829d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner Stack[UpdatedSlot] = Dest; 830d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner RegMap[Dest] = UpdatedSlot; 831d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner delete MI; // Remove the old instruction 832d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner} 833d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner 8340ca2c8e02c40c5fad9faeb725e8ab5df5e76ec06Chris Lattner/// handleCompareFP - Handle FUCOM and FUCOMI instructions, which have two FP 835d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner/// register arguments and no explicit destinations. 8360e0a7a45d3d0a8c865a078459d2e1c6d8967a100Misha Brukman/// 837d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattnervoid FPS::handleCompareFP(MachineBasicBlock::iterator &I) { 838d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner ASSERT_SORTED(ForwardST0Table); ASSERT_SORTED(ReverseST0Table); 839d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner ASSERT_SORTED(ForwardSTiTable); ASSERT_SORTED(ReverseSTiTable); 840d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner MachineInstr *MI = I; 841d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner 84212a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng unsigned NumOperands = MI->getInstrDescriptor()->numOperands; 8430ca2c8e02c40c5fad9faeb725e8ab5df5e76ec06Chris Lattner assert(NumOperands == 2 && "Illegal FUCOM* instruction!"); 844d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2)); 845d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1)); 84676eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0); 84776eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1); 848d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner 849d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner // Make sure the first operand is on the top of stack, the other one can be 850d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner // anywhere. 851d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner moveToTop(Op0, I); 852d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner 85358fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Change from the pseudo instruction to the concrete instruction. 85457790422ca6f4d2af23a4e29af3c48a19a5cfbd8Chris Lattner MI->getOperand(0).setReg(getSTReg(Op1)); 85557790422ca6f4d2af23a4e29af3c48a19a5cfbd8Chris Lattner MI->RemoveOperand(1); 85612a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng MI->setInstrDescriptor(TII->get(getConcreteOpcode(MI->getOpcode()))); 85757790422ca6f4d2af23a4e29af3c48a19a5cfbd8Chris Lattner 858d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner // If any of the operands are killed by this instruction, free them. 859d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner if (KillsOp0) freeStackSlotAfter(I, Op0); 860d62d5d7e5bb353785784fc40c088836c4cf160b4Chris Lattner if (KillsOp1 && Op0 != Op1) freeStackSlotAfter(I, Op1); 861a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 862a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 863c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner/// handleCondMovFP - Handle two address conditional move instructions. These 864c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner/// instructions move a st(i) register to st(0) iff a condition is true. These 865c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner/// instructions require that the first operand is at the top of the stack, but 866c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner/// otherwise don't modify the stack at all. 867c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattnervoid FPS::handleCondMovFP(MachineBasicBlock::iterator &I) { 868c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner MachineInstr *MI = I; 869c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner 870c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner unsigned Op0 = getFPReg(MI->getOperand(0)); 8716cdb1ea610c2d802696da55c55bf73c44202a2dbChris Lattner unsigned Op1 = getFPReg(MI->getOperand(2)); 872ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1); 873c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner 874c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner // The first operand *must* be on the top of the stack. 875c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner moveToTop(Op0, I); 876c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner 877c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner // Change the second operand to the stack register that the operand is in. 87858fe459e36605342410e8c11d12ee1901428b14bChris Lattner // Change from the pseudo instruction to the concrete instruction. 879c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner MI->RemoveOperand(0); 8806cdb1ea610c2d802696da55c55bf73c44202a2dbChris Lattner MI->RemoveOperand(1); 881c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner MI->getOperand(0).setReg(getSTReg(Op1)); 88212a447898a3c68c1a9489f71b82650b46244d00aEvan Cheng MI->setInstrDescriptor(TII->get(getConcreteOpcode(MI->getOpcode()))); 88358fe459e36605342410e8c11d12ee1901428b14bChris Lattner 884c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner // If we kill the second operand, make sure to pop it from the stack. 885ddd2a4556a0b4d0e364de7087ccf1475fa23f39fEvan Cheng if (Op0 != Op1 && KillsOp1) { 88676eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner // Get this value off of the register stack. 88776eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner freeStackSlotAfter(I, Op1); 88876eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner } 889c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner} 890c1bab32bc56e6d27d1223431716523bbe35e4d2eChris Lattner 891a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 892a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// handleSpecialFP - Handle special instructions which behave unlike other 893cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman/// floating point instructions. This is primarily intended for use by pseudo 894a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// instructions. 895a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner/// 896a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattnervoid FPS::handleSpecialFP(MachineBasicBlock::iterator &I) { 897c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos MachineInstr *MI = I; 898a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner switch (MI->getOpcode()) { 899a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner default: assert(0 && "Unknown SpecialFP instruction!"); 900849f214a4e3676e41168b0c5398165c4d4fb99f8Dale Johannesen case X86::FpGETRESULT32: // Appears immediately after a call returning FP type! 901849f214a4e3676e41168b0c5398165c4d4fb99f8Dale Johannesen case X86::FpGETRESULT64: // Appears immediately after a call returning FP type! 902a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop == 0 && "Stack should be empty after a call!"); 903a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner pushReg(getFPReg(MI->getOperand(0))); 904a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner break; 905849f214a4e3676e41168b0c5398165c4d4fb99f8Dale Johannesen case X86::FpSETRESULT32: 906849f214a4e3676e41168b0c5398165c4d4fb99f8Dale Johannesen case X86::FpSETRESULT64: 907a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(StackTop == 1 && "Stack should have one element on it to return!"); 908a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner --StackTop; // "Forget" we have something on the top of stack! 909a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner break; 910e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen case X86::MOV_Fp3232: 911e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen case X86::MOV_Fp3264: 912e377d4d142d7e2ec9266435087c99ffc43f394aaDale Johannesen case X86::MOV_Fp6432: 91359a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp6464: 91459a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp3280: 91559a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp6480: 91659a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp8032: 91759a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp8064: 91859a587337e1c3bde6c0c560ad34f9ee73bb78328Dale Johannesen case X86::MOV_Fp8080: { 919a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned SrcReg = getFPReg(MI->getOperand(1)); 920a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned DestReg = getFPReg(MI->getOperand(0)); 921a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 92276eb08bcda869413d4e730dce290874762d5bfd3Chris Lattner if (LV->KillsRegister(MI, X86::FP0+SrcReg)) { 923a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // If the input operand is killed, we can just change the owner of the 924a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // incoming stack slot into the result. 925a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner unsigned Slot = getSlot(SrcReg); 926a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner assert(Slot < 7 && DestReg < 7 && "FpMOV operands invalid!"); 927a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner Stack[Slot] = DestReg; 928a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner RegMap[DestReg] = Slot; 929a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 930a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } else { 931a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // For FMOV we just duplicate the specified value to a new stack slot. 932a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner // This could be made better, but would require substantial changes. 933a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner duplicateToTop(SrcReg, DestReg, I); 934a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 935a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner break; 936a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 937a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner } 938a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner 939c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos I = MBB->erase(I); // Remove the pseudo instruction 940c0b9dc5be79f009d260edb5cd5e1d8346587aaa2Alkis Evlogimenos --I; 941a960d95253be892d5f2e3017ba5df989c247a0c1Chris Lattner} 942