1//===-- PTXRegAlloc.cpp - PTX Register Allocator --------------------------===// 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// This file contains a register allocator for PTX code. 11// 12//===----------------------------------------------------------------------===// 13 14#define DEBUG_TYPE "ptx-reg-alloc" 15 16#include "PTX.h" 17#include "llvm/CodeGen/MachineFunctionPass.h" 18#include "llvm/CodeGen/RegAllocRegistry.h" 19 20using namespace llvm; 21 22namespace { 23 // Special register allocator for PTX. 24 class PTXRegAlloc : public MachineFunctionPass { 25 public: 26 static char ID; 27 PTXRegAlloc() : MachineFunctionPass(ID) { 28 initializePHIEliminationPass(*PassRegistry::getPassRegistry()); 29 initializeTwoAddressInstructionPassPass(*PassRegistry::getPassRegistry()); 30 } 31 32 virtual const char* getPassName() const { 33 return "PTX Register Allocator"; 34 } 35 36 virtual void getAnalysisUsage(AnalysisUsage &AU) const { 37 AU.setPreservesCFG(); 38 AU.addRequiredID(PHIEliminationID); 39 AU.addRequiredID(TwoAddressInstructionPassID); 40 MachineFunctionPass::getAnalysisUsage(AU); 41 } 42 43 virtual bool runOnMachineFunction(MachineFunction &MF) { 44 // We do not actually do anything (at least not yet). 45 return false; 46 } 47 }; 48 49 char PTXRegAlloc::ID = 0; 50 51 static RegisterRegAlloc 52 ptxRegAlloc("ptx", "PTX register allocator", createPTXRegisterAllocator); 53} 54 55FunctionPass *llvm::createPTXRegisterAllocator() { 56 return new PTXRegAlloc(); 57} 58 59