forked from OSchip/llvm-project
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
//===-- AlphaBranchSelector.cpp - Convert Pseudo branchs ----------*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Andrew Lenharth and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Replace Pseudo COND_BRANCH_* with their appropriate real branch
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// Simplified version of the PPC Branch Selector
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//
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//===----------------------------------------------------------------------===//
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#include "Alpha.h"
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#include "AlphaInstrInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetAsmInfo.h"
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using namespace llvm;
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namespace {
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struct VISIBILITY_HIDDEN AlphaBSel : public MachineFunctionPass {
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virtual bool runOnMachineFunction(MachineFunction &Fn);
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virtual const char *getPassName() const {
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return "Alpha Branch Selection";
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}
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};
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}
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/// createAlphaBranchSelectionPass - returns an instance of the Branch Selection
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/// Pass
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///
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FunctionPass *llvm::createAlphaBranchSelectionPass() {
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return new AlphaBSel();
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}
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bool AlphaBSel::runOnMachineFunction(MachineFunction &Fn) {
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for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E;
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++MFI) {
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MachineBasicBlock *MBB = MFI;
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for (MachineBasicBlock::iterator MBBI = MBB->begin(), EE = MBB->end();
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MBBI != EE; ++MBBI) {
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if (MBBI->getOpcode() == Alpha::COND_BRANCH_I ||
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MBBI->getOpcode() == Alpha::COND_BRANCH_F) {
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// condbranch operands:
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// 0. bc opcode
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// 1. reg
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// 2. target MBB
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const TargetInstrInfo *TII = Fn.getTarget().getInstrInfo();
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MBBI->setInstrDescriptor(TII->get(MBBI->getOperand(0).getImm()));
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}
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}
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}
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return true;
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}
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