%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
// instruction with IMPLICIT_DEF.
MI->setDesc(TII.get(TargetInstrInfo::IMPLICIT_DEF));
MI->RemoveOperand(2); // SubIdx
+ MI->getOperand(1).setImplicit(true);
DEBUG(errs() << "subreg: replace by: " << *MI);
return true;
}