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Re: cmpxchg and x86 flags output

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  Re: cmpxchg and x86 flags output "H. Peter Anvin" <hpa@zytor.com> - 2016-08-19 19:30 +0200
    Re: cmpxchg and x86 flags output David Howells <dhowells@redhat.com> - 2016-08-22 17:20 +0200

#1466576 — Re: cmpxchg and x86 flags output

On 06/22/16 09:14, David Howells wrote:
> H. Peter Anvin <hpa@zytor.com> wrote:
> 
>> So how do we make this move forward?
> 
> Getting my API additions in is relatively straightforward, I think.  The
> whether-or-notness of the cmpxchg operation succeeding can be calculated by
> comparing the original value read from memory with the value-to-be-replaced
> inside the API function.
> 
> This can later be replaced with the boolean output from the CMPXCHG
> instruction, the branch target from the LL/SC skipping or the result of the
> intrinsics.
> 

Hi David,

Any news on this?  Can we perhaps help making this go forward at some point?

	-hpa

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#1467698

H. Peter Anvin <hpa@zytor.com> wrote:

> Any news on this?  Can we perhaps help making this go forward at some point?

I'm just bringing my patches up to date with an eye on extracting and pushing
the more general (ie. less contentious) bits.

David

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