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MachineVerifier: Allow LiveInterval segments to end at a partial write. 

In the subregister liveness tracking case we do not create implicit
reads on partial register writes anymore, still we need to produce a new
SSA value for partial writes so the live segment has to end.

llvm-svn: 223895
This commit is contained in:
Matthias Braun 2014-12-10 01:13:11 +00:00
parent 279f83645c
commit 21554d9b30
1 changed files with 10 additions and 2 deletions
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12
llvm/lib/CodeGen/MachineVerifier.cpp
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@ -1548,19 +1548,27 @@ void MachineVerifier::verifyLiveRangeSegment(const LiveRange &LR,
// A live segment can end with either a redefinition, a kill flag on a
// use, or a dead flag on a def.
bool hasRead = false;
bool hasSubRegDef = 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->readsReg())
hasRead = true;
}
if (!S.end.isDead()) {
if (!hasRead) {
report("Instruction ending live segment doesn't read the register", MI);
*OS << S << " in " << LR << '\n';
// When tracking subregister liveness, the main range must start new
// values on partial register writes, even if there is no read.
if (!MRI->tracksSubRegLiveness() || LaneMask != 0 || !hasSubRegDef) {
report("Instruction ending live segment doesn't read the register",
MI);
*OS << S << " in " << LR << '\n';
}
}
}
}