[llvm-commits] [llvm] r131781 - in /llvm/trunk: lib/Analysis/BasicAliasAnalysis.cpp test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll test/Analysis/TypeBasedAliasAnalysis/dynamic-indices.ll

[Duncan Sands]

>> Author: djg
>> Date: Fri May 20 20:05:08 2011
>> New Revision: 131781
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=131781&view=rev
>> Log:
>> When BasicAA can determine that two pointers have the same base but
>> differ by a dynamic offset, return PartialAlias instead of MayAlias.
>> See the comment in the code for details. This fixes PR9971.
>
> I speculatively reverted this commit to see if doing so fixes this breakage:
> http://google1.osuosl.org:8011/builders/dragonegg-x86_64-linux/builds/1494

It did fix the buildbot.  At the point of failure, gcc and dragonegg (but not
yet LLVM) had been built by dragonegg.  Assuming that dragonegg miscompiled
itself (which seems likely given that the failure was an APInt assertion) it
may be feasible to reduce a testcase.  Would you like me to try?

Ciao, Duncan.