[LLVMdev] Bug in InstructionCombining.cpp

[Chris Lattner]

> ISSUE: This code:
> Crashes when run through opt -instcombine.  InstCombiner visits

Fixed:
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20020916/000286.html
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20020916/000287.html

Thanks for finding this!  Dead bugs are the best kind.  :)

-Chris



> instructions in reverse declaration order, but
> InstCombiner::visitGetElementPtr() , when trying to combine %pbobel with
> %pbob2, assumes that aliases like %pbob2 have already been eliminated.
>  The result is a dereference of an invalid iterator, and an attempt to
> replace %pbobel with "getelementptr %bob* %pbob1, ubyte 0".
>
> ACTION: When  combining constant index expressions in InstCombiner,
> treat the source index as 0 if not present.
>
> --
> Casey Carter
> Casey at Carter.net
> ccarter at uiuc.edu
> AIM: cartec69
>
>

-Chris

http://llvm.cs.uiuc.edu/
http://www.nondot.org/~sabre/Projects/