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Hi Rafael, As you mentioned in the bug, we should only apply this change when hard-float is set, which it is by default on armv7a, I presume. >From that part of the code, I can infer that by the time "MaxAtomicPromoteWidth = 64;", the variable SoftFloat is not properly set, so a simple "if (!SoftFloat)" won't cut in there. It seems SoftFloat is being set on

Identified a while before the release, there is an issue with 64-bit atomics on ARM that was making Clang mis-compile a lot of code, including Clang itself. http://llvm.org/bugs/show_bug.cgi?id=15429 Attached is a patch proposed by Benjamin with the corrections to the test. I'm not an expert on how Clang lowers C11 atomics, but the resulting IR seems correct, and after self-hosting Clang

...the attached patch (with tests and comments added). Cheers, Rafael -------------- next part -------------- A non-text attachment was scrubbed... Name: t.patch Type: application/octet-stream Size: 1135 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130513/d36a4baf/attachment.obj>