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" 20 using namespace llvm; 21 22 namespace { 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 /// 39 FunctionPass *llvm::createAlphaBranchSelectionPass() { 40 return new AlphaBSel(); 41 } 42 43 bool 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
