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Be more precise about verifying missing kill flags. 

It is legal for an instruction to have two operands using the same register,
only one a kill. This is interpreted as a kill.

llvm-svn: 117981
This commit is contained in:
Jakob Stoklund Olesen 2010-11-01 23:59:53 +00:00
parent 1e32688e4c
commit 2551f13c83
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/CodeGen/MachineVerifier.cpp
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@ -624,12 +624,14 @@ MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
}
// Verify isKill == LI.killedAt.
if (!MI->isRegTiedToDefOperand(MONum)) {
// MI could kill register without a kill flag on MO.
bool miKill = MI->killsRegister(Reg);
bool liKill = LI.killedAt(UseIdx.getDefIndex());
if (isKill && !liKill) {
if (miKill && !liKill) {
report("Live range continues after kill flag", MO, MONum);
*OS << "Live range: " << LI << '\n';
}
if (!isKill && liKill) {
if (!miKill && liKill) {
report("Live range ends without kill flag", MO, MONum);
*OS << "Live range: " << LI << '\n';
}