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Check for extra kill flags on live-out virtual registers.

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This would previously get reported as the misleading "Virtual register
def doesn't dominate all uses."

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159460 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-06-29 21:00:00 +00:00
parent 6c50551e9a
commit bb0721680c
1 changed files with 14 additions and 0 deletions
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14
lib/CodeGen/MachineVerifier.cpp
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@ -1049,6 +1049,20 @@ void MachineVerifier::visitMachineFunctionAfter() {
// Now check liveness info if available // Now check liveness info if available
calcRegsRequired(); calcRegsRequired();
// Check for killed virtual registers that should be live out.
for (MachineFunction::const_iterator MFI = MF->begin(), MFE = MF->end();
MFI != MFE; ++MFI) {
BBInfo &MInfo = MBBInfoMap[MFI];
for (RegSet::iterator
I = MInfo.vregsRequired.begin(), E = MInfo.vregsRequired.end(); I != E;
++I)
if (MInfo.regsKilled.count(*I)) {
report("Virtual register killed in block, but needed live out.", MFI);
*OS << "Virtual register " << PrintReg(*I)
<< " is used after the block.\n";
}
}
if (!MF->empty()) { if (!MF->empty()) {
BBInfo &MInfo = MBBInfoMap[&MF->front()]; BBInfo &MInfo = MBBInfoMap[&MF->front()];
for (RegSet::iterator for (RegSet::iterator