tree 9d57019d7e87648a5884ec6b5d58b7e55c25830a
parent be92019b237e5428f170aeba09b4bcaa1178a80f
author Tom Stellard <tstellar@redhat.com> 1506642099 +0000
committer Tom Stellard <tstellar@redhat.com> 1506642099 +0000

Merging r312447:

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r312447 | hfinkel | 2017-09-03 10:18:25 -0700 (Sun, 03 Sep 2017) | 12 lines

[CodeGen] Treat all vector fields as mayalias

Because it is common to treat vector types as an array of their elements, or
even some other type that's not the element type, and thus index into them, we
can't use struct-path TBAA for these accesses. Even though we already treat all
vector types as equivalent to 'char', we were using field-offset information
for them with TBAA, and this renders undefined the intra-value indexing we
intend to allow. Note that, although 'char' is universally aliasing, with path
TBAA, we can still differentiate between access to s.a and s.b in
  struct { char a, b; } s;. We can't use this capability as-is for vector types.

Fixes PR33967.
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@314476 91177308-0d34-0410-b5e6-96231b3b80d8