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Also recompute HasPHIKill flags in LiveInterval::RenumberValues.

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If a phi-def value were removed from the interval, the phi-kill flags are no
longer valid.

llvm-svn: 110949
This commit is contained in:
Jakob Stoklund Olesen
2010-08-12 20:38:03 +00:00
parent 44a320dafa
commit 0910689353
3 changed files with 25 additions and 3 deletions
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23
llvm/lib/CodeGen/LiveInterval.cpp
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@@ -182,8 +182,9 @@ void LiveInterval::markValNoForDeletion(VNInfo *ValNo) {
/// RenumberValues - Renumber all values in order of appearance and delete the
/// remaining unused values.
void LiveInterval::RenumberValues() {
void LiveInterval::RenumberValues(LiveIntervals &lis) {
SmallPtrSet<VNInfo*, 8> Seen;
bool seenPHIDef = false;
valnos.clear();
for (const_iterator I = begin(), E = end(); I != E; ++I) {
VNInfo *VNI = I->valno;
@@ -192,6 +193,26 @@ void LiveInterval::RenumberValues() {
assert(!VNI->isUnused() && "Unused valno used by live range");
VNI->id = (unsigned)valnos.size();
valnos.push_back(VNI);
VNI->setHasPHIKill(false);
if (VNI->isPHIDef())
seenPHIDef = true;
}
// Recompute phi kill flags.
if (!seenPHIDef)
return;
for (const_vni_iterator I = vni_begin(), E = vni_end(); I != E; ++I) {
VNInfo *VNI = *I;
if (!VNI->isPHIDef())
continue;
const MachineBasicBlock *PHIBB = lis.getMBBFromIndex(VNI->def);
assert(PHIBB && "No basic block for phi-def");
for (MachineBasicBlock::const_pred_iterator PI = PHIBB->pred_begin(),
PE = PHIBB->pred_end(); PI != PE; ++PI) {
VNInfo *KVNI = getVNInfoAt(lis.getMBBEndIdx(*PI).getPrevSlot());
if (KVNI)
KVNI->setHasPHIKill(true);
}
}
}