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