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PR9446: RecursivelyDeleteTriviallyDeadInstructions can delete the instruction

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after the given instruction; make sure to handle that case correctly.
(It's difficult to trigger; the included testcase involves a dead 
block, but I don't think that's a requirement.) 

While I'm here, get rid of the unnecessary warning about
SimplifyInstructionsInBlock, since it should work correctly as far as I know.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128782 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-04-02 22:45:17 +00:00
parent 6bdd261df9
commit 71ad2c9eda
3 changed files with 36 additions and 5 deletions
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5
lib/Transforms/Utils/Local.cpp
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@ -332,8 +332,11 @@ bool llvm::SimplifyInstructionsInBlock(BasicBlock *BB, const TargetData *TD) {
BI = BB->begin();
continue;
}
WeakVH BIHandle(BI);
MadeChange |= RecursivelyDeleteTriviallyDeadInstructions(Inst);
if (BIHandle != BI)
BI = BB->begin();
}
return MadeChange;
}