[PATCH] D51817: Do not use optimized atomic libcalls for misaligned atomics.

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith created this revision.
rsmith added reviewers: jyknight, t.p.northover.
Herald added a subscriber: jfb.

The optimized (__atomic_foo_<n>) libcalls assume that the atomic object
is properly aligned, so should never be called on an underaligned
object.

This addresses one of several problems identified in PR38846.


Repository:
  rC Clang

https://reviews.llvm.org/D51817

Files:
  lib/CodeGen/CGAtomic.cpp
  test/CodeGen/atomic-ops.c

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