Re: [PATCH v0 21/71] perf tools: Add feature test for __sync_val_compare_and_swap

[Adrian Hunter]

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.

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