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749c6f6b5e
Make MachineInstr::getDesc return a reference instead of a pointer, since it can never be null. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45695 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Constant.h"
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#include "llvm/DerivedTypes.h"
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using namespace llvm;
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/// findTiedToSrcOperand - Returns the operand that is tied to the specified
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/// dest operand. Returns -1 if there isn't one.
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int TargetInstrDesc::findTiedToSrcOperand(unsigned OpNum) const {
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
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if (i == OpNum)
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continue;
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if (getOperandConstraint(i, TOI::TIED_TO) == (int)OpNum)
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return i;
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}
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return -1;
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}
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TargetInstrInfo::TargetInstrInfo(const TargetInstrDesc* Desc,
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unsigned numOpcodes)
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: Descriptors(Desc), NumOpcodes(numOpcodes) {
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}
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TargetInstrInfo::~TargetInstrInfo() {
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}
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bool TargetInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
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const TargetInstrDesc &TID = MI->getDesc();
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if (!TID.isTerminator()) return false;
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// Conditional branch is a special case.
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if (TID.isBranch() && !TID.isBarrier())
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return true;
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if (!TID.isPredicable())
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return true;
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return !isPredicated(MI);
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}
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