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Fix PR7096. When a block containing multiple defs is tail duplicated, the

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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
This commit is contained in:
Bob Wilson 2010-05-10 17:14:26 +00:00
parent 26c4cf4c6f
commit fde18e5eff
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/MachineSSAUpdater.cpp
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@ -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;
}