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| author | Cameron Zwarich <zwarich@apple.com> | 2013-02-12 05:48:58 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2013-02-12 05:48:58 +0000 |
| commit | 7c85c9433cffac9192529b55e4a7c1331ec206e6 (patch) | |
| tree | 10d6e1760370d77505d42659fc2bb3a1b88018d6 /llvm/lib/CodeGen/PHIElimination.cpp | |
| parent | 4ee9aef208a08590bca15c7ef87c42f663e95309 (diff) | |
| download | llvm-7c85c9433cffac9192529b55e4a7c1331ec206e6.zip llvm-7c85c9433cffac9192529b55e4a7c1331ec206e6.tar.gz llvm-7c85c9433cffac9192529b55e4a7c1331ec206e6.tar.bz2 | |
Don't consider definitions by other PHIs live-in when trimming a PHI source's
live range after inserting a copy at the end of a block.
llvm-svn: 174945
Diffstat (limited to 'llvm/lib/CodeGen/PHIElimination.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/PHIElimination.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/PHIElimination.cpp b/llvm/lib/CodeGen/PHIElimination.cpp index f046ac9..abad5c1 100644 --- a/llvm/lib/CodeGen/PHIElimination.cpp +++ b/llvm/lib/CodeGen/PHIElimination.cpp @@ -467,7 +467,11 @@ void PHIElimination::LowerPHINode(MachineBasicBlock &MBB, bool isLiveOut = false; for (MachineBasicBlock::succ_iterator SI = opBlock.succ_begin(), SE = opBlock.succ_end(); SI != SE; ++SI) { - if (SrcLI.liveAt(LIS->getMBBStartIdx(*SI))) { + SlotIndex startIdx = LIS->getMBBStartIdx(*SI); + VNInfo *VNI = SrcLI.getVNInfoAt(startIdx); + + // Definitions by other PHIs are not truly live-in for our purposes. + if (VNI && VNI->def != startIdx) { isLiveOut = true; break; } |