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| author | Bob Wilson <bob.wilson@apple.com> | 2010-05-10 17:14:26 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2010-05-10 17:14:26 +0000 |
| commit | fde18e5eff86b5055d7ed541fa87cde5aa1ab31c (patch) | |
| tree | ed6755002d31b46b3b6d0f52067bcb8c9b7db377 | |
| parent | 26c4cf4c6fedb3439d4a9f8f7375ff1c61e0acd5 (diff) | |
Fix PR7096. When a block containing multiple defs is tail duplicated, the
SSAUpdater for the value from the first def may see uses of undefined values,
because the later defs will not have been updated yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103407 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/MachineSSAUpdater.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/CodeGen/MachineSSAUpdater.cpp b/lib/CodeGen/MachineSSAUpdater.cpp index 99fb99ac3c..84d6df2539 100644 --- a/lib/CodeGen/MachineSSAUpdater.cpp +++ b/lib/CodeGen/MachineSSAUpdater.cpp @@ -329,7 +329,7 @@ public: /// InstrIsPHI - Check if an instruction is a PHI. /// static MachineInstr *InstrIsPHI(MachineInstr *I) { - if (I->isPHI()) + if (I && I->isPHI()) return I; return 0; } |