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Re: [rs6000] Streamline compare-and-swap success return value computation
On Mon, Nov 28, 2011 at 7:33 PM, Richard Henderson <rth@redhat.com> wrote:
> On 11/28/2011 04:26 PM, Richard Henderson wrote:
>> On 11/28/2011 03:05 PM, Richard Henderson wrote:
>>> On 11/28/2011 02:16 PM, Alan Modra wrote:
>>>> Hmm, I suppose you could argue that powerpc and others ought to not
>>>> generate those three extra instructions when using the return value.
>>>> I'll see about fixing powerpc.
>>>
>>> However, we can do better by considering the value to be stored in CR0...
>>
>> Try this and see if it generates the sort of code you want. ?Untested.
>
> ... actually, this one. ?There's no reason to differentiate between strong
> and weak compare-and-swap when computing boolval.
Has anyone bootstrapped and regression-tested the patch?
Thanks, David