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Verify kill flags conservatively.

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Allow a live range to end with a kill flag, but don't allow a kill flag that
doesn't end the live range.

This makes the machine code verifier more useful during register allocation when
kill flag computation is deferred.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124838 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-02-04 00:39:18 +00:00
parent 0ed92f2de3
commit a7b586ba74
1 changed files with 5 additions and 18 deletions
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23
lib/CodeGen/MachineVerifier.cpp
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@ -647,24 +647,11 @@ MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
report("No live range at use", MO, MONum);
*OS << UseIdx << " is not live in " << LI << '\n';
}
// Verify isKill == LI.killedAt.
// Two-address instrs don't have kill flags on the tied operands, and
// we even allow
// %r1 = add %r1, %r1
// without a kill flag on the untied operand.
// MI->findRegisterUseOperandIdx finds the first operand using reg.
if (!MI->isRegTiedToDefOperand(MI->findRegisterUseOperandIdx(Reg))) {
// MI could kill register without a kill flag on MO.
bool miKill = MI->killsRegister(Reg);
bool liKill = LI.killedAt(UseIdx.getDefIndex());
if (miKill && !liKill) {
report("Live range continues after kill flag", MO, MONum);
*OS << "Live range: " << LI << '\n';
}
if (!miKill && liKill) {
report("Live range ends without kill flag", MO, MONum);
*OS << "Live range: " << LI << '\n';
}
// Check for extra kill flags.
// Note that we allow missing kill flags for now.
if (MO->isKill() && !LI.killedAt(UseIdx.getDefIndex())) {
report("Live range continues after kill flag", MO, MONum);
*OS << "Live range: " << LI << '\n';
}
} else {
report("Virtual register has no Live interval", MO, MONum);