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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208371 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet 2014-05-08 23:12:27 +00:00
parent 8ec421c255
commit 8d53407abb
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() &&