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[TargetInstrInfo] Fix the implementation of commuteInstruction to match the

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comment of the API.

Relaxes the behavior of TargetInstrInfo::commuteInstruction when
TargetInstrInfo::findCommutedOpIndices returns false.

Previously TargetInstrInfo triggered a fatal error in such situation whereas based
on the comment in the API it should just return nullptr. Indeed the only
precondition that should be ensured is that the instruction must be commutable.

llvm-svn: 208371
This commit is contained in:
Quentin Colombet 2014-05-08 23:12:27 +00:00
parent 4fd21ddfc8
commit 112f8aafc2
1 changed files with 2 additions and 4 deletions
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6
lib/CodeGen/TargetInstrInfo.cpp
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@ -127,10 +127,8 @@ MachineInstr *TargetInstrInfo::commuteInstruction(MachineInstr *MI,
return nullptr;
unsigned Idx1, Idx2;
if (!findCommutedOpIndices(MI, Idx1, Idx2)) {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Don't know how to commute: " << *MI;
report_fatal_error(Msg.str());
assert(MI->isCommutable() && "Precondition violation: MI must be commutable.");
return nullptr;
}
assert(MI->getOperand(Idx1).isReg() && MI->getOperand(Idx2).isReg() &&