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Revert r131781 again. Apparently there is more going on here.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2011-06-04 05:11:22 +00:00
parent 1023f5a42d
commit 9a9d218ed0
2 changed files with 2 additions and 12 deletions
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12
lib/Analysis/BasicAliasAnalysis.cpp
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@ -944,17 +944,7 @@ BasicAliasAnalysis::aliasGEP(const GEPOperator *GEP1, uint64_t V1Size,
return NoAlias; return NoAlias;
} }
// Statically, we can see that the base objects are the same, but the return MayAlias;
// pointers have dynamic offsets which we can't resolve. And none of our
// little tricks above worked.
//
// TODO: Returning PartialAlias instead of MayAlias is a mild hack; the
// practical effect of this is protecting TBAA in the case of dynamic
// indices into arrays of unions. An alternative way to solve this would
// be to have clang emit extra metadata for unions and/or union accesses.
// A union-specific solution wouldn't handle the problem for malloc'd
// memory however.
return PartialAlias;
} }
static AliasAnalysis::AliasResult static AliasAnalysis::AliasResult

2
test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll
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@ -1,4 +1,4 @@
; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output |& grep {1 partial alias} ; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output |& grep {1 may alias}
; PR7959 ; PR7959
target datalayout = "e-p:32:32:32" target datalayout = "e-p:32:32:32"