LiveRangeQuery simplifies shrinkToUses().
llvm-svn: 157145
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@ -654,9 +654,8 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
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if (UseMI->isDebugValue() || !UseMI->readsVirtualRegister(li->reg))
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continue;
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SlotIndex Idx = getInstructionIndex(UseMI).getRegSlot();
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// Note: This intentionally picks up the wrong VNI in case of an EC redef.
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// See below.
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VNInfo *VNI = li->getVNInfoBefore(Idx);
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LiveRangeQuery LRQ(*li, Idx);
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VNInfo *VNI = LRQ.valueIn();
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if (!VNI) {
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// This shouldn't happen: readsVirtualRegister returns true, but there is
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// no live value. It is likely caused by a target getting <undef> flags
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@ -667,13 +666,10 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
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continue;
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}
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// Special case: An early-clobber tied operand reads and writes the
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// register one slot early. The getVNInfoBefore call above would have
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// picked up the value defined by UseMI. Adjust the kill slot and value.
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if (SlotIndex::isSameInstr(VNI->def, Idx)) {
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Idx = VNI->def;
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VNI = li->getVNInfoBefore(Idx);
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assert(VNI && "Early-clobber tied value not available");
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}
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// register one slot early.
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if (VNInfo *DefVNI = LRQ.valueDefined())
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Idx = DefVNI->def;
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WorkList.push_back(std::make_pair(Idx, VNI));
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}
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