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Don't store COPY pointers in VNInfo.

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If a value is defined by a COPY, that instuction can easily and cheaply
be found by getInstructionFromIndex(VNI->def).

This reduces the size of VNInfo from 24 to 16 bytes, and improves
llc compile time by 3%.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149763 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-02-04 05:20:49 +00:00
parent edc8db87dc
commit 3b1088a2cc
9 changed files with 52 additions and 119 deletions
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1
lib/CodeGen/StrongPHIElimination.cpp
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@@ -779,7 +779,6 @@ void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
SlotIndex MBBStartIndex = LI->getMBBStartIdx(MBB);
SlotIndex DestCopyIndex = LI->getInstructionIndex(CopyInstr);
VNInfo *CopyVNI = CopyLI.getNextValue(MBBStartIndex,
CopyInstr,
LI->getVNInfoAllocator());
CopyVNI->setIsPHIDef(true);
CopyLI.addRange(LiveRange(MBBStartIndex,