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| author | Cameron Zwarich <zwarich@apple.com> | 2011-05-20 03:54:04 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2011-05-20 03:54:04 +0000 |
| commit | 21a70bf4a57568d64b535771fd20d25fc0ed9112 (patch) | |
| tree | fad548bcfe18034f6420c8761d8a090786d2d91b /lib/CodeGen/SimpleRegisterCoalescing.cpp | |
| parent | 074397d75e0bf919995f9cf0005fa6fda1c0400c (diff) | |
Fix PR9960 by teaching SimpleRegisterCoalescing::AdjustCopiesBackFrom() to preserve
the phikill flag.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131717 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')
| -rw-r--r-- | lib/CodeGen/SimpleRegisterCoalescing.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp index 06ed66fee7..c33ce24c5e 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -252,7 +252,12 @@ bool SimpleRegisterCoalescing::AdjustCopiesBackFrom(const CoalescerPair &CP, // Okay, merge "B1" into the same value number as "B0". if (BValNo != ValLR->valno) { + // If B1 is killed by a PHI, then the merged live range must also be killed + // by the same PHI, as B0 and B1 can not overlap. + bool HasPHIKill = BValNo->hasPHIKill(); IntB.MergeValueNumberInto(BValNo, ValLR->valno); + if (HasPHIKill) + ValLR->valno->setHasPHIKill(true); } DEBUG({ dbgs() << " result = "; |