[PATCH] D54787: [PowerPC] Vector load/store builtins overstate alignment of pointers

[Nemanja Ivanovic via Phabricator via cfe-commits]

nemanjai created this revision.
nemanjai added reviewers: hfinkel, jsji, wuzish.
Herald added subscribers: kristina, kbarton.

A number of builtins in altivec.h load/store vectors from pointers to scalar types. Currently they just cast the pointer to a vector pointer, but expressions like that have the alignment of the target type. Of course, the input pointer did not have that alignment so this triggers UBSan (and rightly so).

This resolves https://bugs.llvm.org/show_bug.cgi?id=39704


Repository:
  rC Clang

https://reviews.llvm.org/D54787

Files:
  lib/Headers/altivec.h
  test/CodeGen/builtins-ppc-altivec.c
  test/CodeGen/builtins-ppc-vsx.c

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