lkml.org 
[lkml]   [2013]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v0 21/71] perf tools: Add feature test for __sync_val_compare_and_swap
On 11/12/13 22:07, Andi Kleen wrote:
>> Can you provide more info about these gcc builtins and what is the
>> minimum system where this test will succeed?
>
> CMPXCHG for x86 is available since the 486 or so, so practically
> everywhere.
>
> I think that's mainly for other architectures.
>
> it would be reasonable to just use #if defined(__x86_64__) || defined(__i386__)
> instead.

__sync_val_compare_and_swap() is being used in the itrace abstraction which
is architecture neutral, so I can't use x86 defines.



\
 
 \ /
  Last update: 2013-12-12 15:21    [W:0.121 / U:0.700 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site