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SubjectRe: [BK+PATCH] remove __constant_memcpy
J.A. Magallon wrote:
> On 04.17, Jeff Garzik wrote:
>
>>On Thu, Apr 17, 2003 at 09:07:45AM -0700, Linus Torvalds wrote:
>
> [...]
>
>> #define memcpy(t, f, n) \
>> (__builtin_constant_p(n) ? \
>> __constant_memcpy3d((t),(f),(n)) : \
>> __memcpy3d((t),(f),(n)))
>>
>
>
> Do you know if this is more efficient ? :
>
> __builtin_choose_expr(__builtin_constant_p(n), ... , ....)
>
> Perhaps ?: reaches runtime, and __builtin doesn't.


No. The existing code (quoted above) is properly evaluated at
compile-time...

Jeff



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