1//===-- AlphaBranchSelector.cpp - Convert Pseudo branchs ----------*- C++ -*-=// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Replace Pseudo COND_BRANCH_* with their appropriate real branch 11// Simplified version of the PPC Branch Selector 12// 13//===----------------------------------------------------------------------===// 14 15#include "Alpha.h" 16#include "AlphaInstrInfo.h" 17#include "llvm/CodeGen/MachineFunctionPass.h" 18#include "llvm/Target/TargetMachine.h" 19#include "llvm/MC/MCAsmInfo.h" 20using namespace llvm; 21 22namespace { 23 struct AlphaBSel : public MachineFunctionPass { 24 static char ID; 25 AlphaBSel() : MachineFunctionPass(ID) {} 26 27 virtual bool runOnMachineFunction(MachineFunction &Fn); 28 29 virtual const char *getPassName() const { 30 return "Alpha Branch Selection"; 31 } 32 }; 33 char AlphaBSel::ID = 0; 34} 35 36/// createAlphaBranchSelectionPass - returns an instance of the Branch Selection 37/// Pass 38/// 39FunctionPass *llvm::createAlphaBranchSelectionPass() { 40 return new AlphaBSel(); 41} 42 43bool AlphaBSel::runOnMachineFunction(MachineFunction &Fn) { 44 45 for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E; 46 ++MFI) { 47 MachineBasicBlock *MBB = MFI; 48 49 for (MachineBasicBlock::iterator MBBI = MBB->begin(), EE = MBB->end(); 50 MBBI != EE; ++MBBI) { 51 if (MBBI->getOpcode() == Alpha::COND_BRANCH_I || 52 MBBI->getOpcode() == Alpha::COND_BRANCH_F) { 53 54 // condbranch operands: 55 // 0. bc opcode 56 // 1. reg 57 // 2. target MBB 58 const TargetInstrInfo *TII = Fn.getTarget().getInstrInfo(); 59 MBBI->setDesc(TII->get(MBBI->getOperand(0).getImm())); 60 } 61 } 62 } 63 64 return true; 65} 66 67