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Minor bug fix. LowerSubregs should translate

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%S0<def> = EXTRACT_SUBREG %Q0<kill>, 1
to
%S0<def> = IMPLICIT_DEF %Q0<imp-use,kill>

Implicit_def does not *read* any register so the operand should be marked "implicit". The missing "implicit" marker on the operand is wrong, but it doesn't actually break anything.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82503 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-09-22 00:29:40 +00:00
parent 850c9178dc
commit 1c17c1bc54
1 changed files with 1 additions and 0 deletions
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lib/CodeGen/LowerSubregs.cpp
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@ -130,6 +130,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
// instruction with IMPLICIT_DEF. // instruction with IMPLICIT_DEF.
MI->setDesc(TII.get(TargetInstrInfo::IMPLICIT_DEF)); MI->setDesc(TII.get(TargetInstrInfo::IMPLICIT_DEF));
MI->RemoveOperand(2); // SubIdx MI->RemoveOperand(2); // SubIdx
MI->getOperand(1).setImplicit(true);
DEBUG(errs() << "subreg: replace by: " << *MI); DEBUG(errs() << "subreg: replace by: " << *MI);
return true; return true;
} }