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MachineVerifier: On dead-def live segments, check that corresponding machine operand has a dead flag

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2016-03-29 19:07:43 +00:00
parent f27ef7a795
commit 1df673217b
1 changed files with 18 additions and 3 deletions
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21
lib/CodeGen/MachineVerifier.cpp
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@ -1743,18 +1743,33 @@ void MachineVerifier::verifyLiveRangeSegment(const LiveRange &LR,
// use, or a dead flag on a def.
bool hasRead = false;
bool hasSubRegDef = false;
bool hasDeadDef = false;
for (ConstMIBundleOperands MOI(*MI); MOI.isValid(); ++MOI) {
if (!MOI->isReg() || MOI->getReg() != Reg)
continue;
if (LaneMask != 0 &&
(LaneMask & TRI->getSubRegIndexLaneMask(MOI->getSubReg())) == 0)
continue;
if (MOI->isDef() && MOI->getSubReg() != 0)
hasSubRegDef = true;
if (MOI->isDef()) {
if (MOI->getSubReg() != 0)
hasSubRegDef = true;
if (MOI->isDead())
hasDeadDef = true;
}
if (MOI->readsReg())
hasRead = true;
}
if (!S.end.isDead()) {
if (S.end.isDead()) {
// Make sure that the corresponding machine operand for a "dead" live
// range has the dead flag. We cannot perform this check for subregister
// liveranges as partially dead values are allowed.
if (LaneMask == 0 && !hasDeadDef) {
report("Instruction ending live segment on dead slot has no dead flag",
MI);
report_context(LR, Reg, LaneMask);
report_context(S);
}
} else {
if (!hasRead) {
// When tracking subregister liveness, the main range must start new
// values on partial register writes, even if there is no read.