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Fix PR3298, a crash in Jump Threading. Apparently even

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jump threading can have bugs, who knew? ;-)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61983 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-01-09 06:08:12 +00:00
parent d62fc8817c
commit 2a99b482a6
2 changed files with 53 additions and 0 deletions
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4
lib/Transforms/Scalar/JumpThreading.cpp
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@ -504,6 +504,10 @@ bool JumpThreading::SimplifyPartiallyRedundantLoad(LoadInst *LI) {
// If the value if the load is locally available within the block, just use
// it. This frequently occurs for reg2mem'd allocas.
//cerr << "LOAD ELIMINATED:\n" << *BBIt << *LI << "\n";
// If the returned value is the load itself, replace with an undef. This can
// only happen in dead loops.
if (AvailableVal == LI) AvailableVal = UndefValue::get(LI->getType());
LI->replaceAllUsesWith(AvailableVal);
LI->eraseFromParent();
return true;