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Use getVNInfoBefore() when it makes sense.

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llvm-svn: 144517
This commit is contained in:
Jakob Stoklund Olesen
2011-11-14 01:39:36 +00:00
parent 1071cfa4ae
commit d7bcf43dc2
4 changed files with 7 additions and 8 deletions
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5
llvm/lib/CodeGen/LiveInterval.cpp
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@@ -680,15 +680,14 @@ unsigned ConnectedVNInfoEqClasses::Classify(const LiveInterval *LI) {
// Connect to values live out of predecessors.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI)
if (const VNInfo *PVNI =
LI->getVNInfoAt(LIS.getMBBEndIdx(*PI).getPrevSlot()))
if (const VNInfo *PVNI = LI->getVNInfoBefore(LIS.getMBBEndIdx(*PI)))
EqClass.join(VNI->id, PVNI->id);
} else {
// Normal value defined by an instruction. Check for two-addr redef.
// FIXME: This could be coincidental. Should we really check for a tied
// operand constraint?
// Note that VNI->def may be a use slot for an early clobber def.
if (const VNInfo *UVNI = LI->getVNInfoAt(VNI->def.getPrevSlot()))
if (const VNInfo *UVNI = LI->getVNInfoBefore(VNI->def))
EqClass.join(VNI->id, UVNI->id);
}
}