[cfe-commits] [llvm-commits] [PATCH] Teach atomicrmw nand to emit *a = ~(*a & b), not *a = ~*a & b

[Chandler Carruth]

On Fri, Apr 13, 2012 at 11:52 PM, Richard Smith <richard at metafoo.co.uk>wrote:

> On Fri, Apr 13, 2012 at 3:41 PM, Chandler Carruth <chandlerc at google.com>wrote:
>
>> Other than the hideously poor code in some of this it looks entirely
>> correct. LGTM, and *wow* thanks for fixing this.
>
>
> Thanks, r154705.
>
>
>> Can you ensure that the LangRef has the correct spec?
>>
>> Have you looked at ARM or other platforms? (not saying you have to, just
>> curious)
>>
>
> The LangRef has the correct spec. I've checked that MIPS generates the
> right code (there was a pre-existing test for this). We appear to implement
> atomicrmw nand as a libcall on ARM. I've not checked other platfiorms; I
> couldn't find any other atomicrmw nand implementations.
>

Thanks!
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