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Bugfix in InlineSpiller::traceSiblingValue(). 

Properly determine whether or not a phi was added by splitting.
Check against the current VNInfo of OrigLI instead of against the
OrigVNI argument.

Patch provided by Jonas Paulsson. Reviewed by Quentin Colombet.

llvm-svn: 224009
This commit is contained in:
Patrik Hagglund 2014-12-11 10:40:17 +00:00
parent fc081457f1
commit cb06a36c9a
1 changed files with 6 additions and 3 deletions
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9
llvm/lib/CodeGen/InlineSpiller.cpp
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@ -508,6 +508,7 @@ MachineInstr *InlineSpiller::traceSiblingValue(unsigned UseReg, VNInfo *UseVNI,
SmallVector<std::pair<unsigned, VNInfo*>, 8> WorkList;
WorkList.push_back(std::make_pair(UseReg, UseVNI));
LiveInterval &OrigLI = LIS.getInterval(Original);
do {
unsigned Reg;
VNInfo *VNI;
@ -521,8 +522,11 @@ MachineInstr *InlineSpiller::traceSiblingValue(unsigned UseReg, VNInfo *UseVNI,
// Trace through PHI-defs created by live range splitting.
if (VNI->isPHIDef()) {
// Stop at original PHIs. We don't know the value at the predecessors.
if (VNI->def == OrigVNI->def) {
// Stop at original PHIs. We don't know the value at the
// predecessors. Look up the VNInfo for the current definition
// in OrigLI, to properly determine whether or not this phi was
// added by splitting.
if (VNI->def == OrigLI.getVNInfoAt(VNI->def)->def) {
DEBUG(dbgs() << "orig phi value\n");
SVI->second.DefByOrigPHI = true;
SVI->second.AllDefsAreReloads = false;
@ -542,7 +546,6 @@ MachineInstr *InlineSpiller::traceSiblingValue(unsigned UseReg, VNInfo *UseVNI,
// Separate all values dominated by OrigVNI into PHIs and non-PHIs.
SmallVector<VNInfo*, 8> PHIs, NonPHIs;
LiveInterval &LI = LIS.getInterval(Reg);
LiveInterval &OrigLI = LIS.getInterval(Original);
for (LiveInterval::vni_iterator VI = LI.vni_begin(), VE = LI.vni_end();
VI != VE; ++VI) {