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//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
using namespace llvm;
/// findTiedToSrcOperand - Returns the operand that is tied to the specified
/// dest operand. Returns -1 if there isn't one.
int TargetInstrDescriptor::findTiedToSrcOperand(unsigned OpNum) const {
for (unsigned i = 0, e = numOperands; i != e; ++i) {
if (i == OpNum)
continue;
if (getOperandConstraint(i, TOI::TIED_TO) == (int)OpNum)
return i;
}
return -1;
}
TargetInstrInfo::TargetInstrInfo(const TargetInstrDescriptor* Desc,
unsigned numOpcodes)
: desc(Desc), NumOpcodes(numOpcodes) {
}
TargetInstrInfo::~TargetInstrInfo() {
}
bool TargetInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
if (TID->Flags & M_TERMINATOR_FLAG) {
// Conditional branch is a special case.
if ((TID->Flags & M_BRANCH_FLAG) != 0 && (TID->Flags & M_BARRIER_FLAG) == 0)
return true;
if ((TID->Flags & M_PREDICABLE) == 0)
return true;
return !isPredicated(MI);
}
return false;
}
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