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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 | 4930e7266b7643410cfbbed5ef6e4d3b19178918 (patch) | |
| tree | d0d4e7fad3299d24eed948ebeacd5bcd0c080fb8 /lib/CodeGen | |
| parent | 8d49134eeaa36953410c2fba65f7237fb3f079e7 (diff) | |
| download | external_llvm-4930e7266b7643410cfbbed5ef6e4d3b19178918.zip external_llvm-4930e7266b7643410cfbbed5ef6e4d3b19178918.tar.gz external_llvm-4930e7266b7643410cfbbed5ef6e4d3b19178918.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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174945 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index f046ac9..abad5c1 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/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; } |