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

I think that's mainly for other architectures.

it would be reasonable to just use #if defined(__x86_64__) || defined(__i386__)


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