[llvm] r232889 - MemoryDependenceAnalysis: Don't miscompile atomics
tobias at grosser.es
Sat Mar 21 10:25:20 PDT 2015
On 03/21/2015 07:19 AM, David Majnemer wrote:
> Author: majnemer
> Date: Sat Mar 21 01:19:17 2015
> New Revision: 232889
> URL: http://llvm.org/viewvc/llvm-project?rev=232889&view=rev
> MemoryDependenceAnalysis: Don't miscompile atomics
> r216771 introduced a change to MemoryDependenceAnalysis that allowed it
> to reason about acquire/release operations. However, this change does
> not ensure that the acquire/release operations pair. Unfortunately,
> this leads to miscompiles as we won't see an acquire load as properly
> memory effecting. This largely reverts r216771.
> This fixes PR22708.
CCing Robin who might be interested in this issue.
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