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On Tue, 17 Aug 2021 at 13:09, Matheus K. Ferst
<matheus.ferst@eldorado.org.br> wrote:
On 17/08/2021 06:27, Philippe Mathieu-Daudé wrote:
On 8/16/21 9:13 PM, matheus.ferst@eldorado.org.br wrote:
From: Matheus Ferst <matheus.ferst@eldorado.org.br>
-static inline Int128 bswap128(Int128 a)
-{
- return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a)));
-}
Personally I'd move this one to the other #ifdef side,
and implement here with __builtin_bswap128().
I saw this builtin, but I couldn't test it on my system. It seems that
Clang doesn't implement it, and it's only available on GCC 11:
https://godbolt.org/z/T6vhd5a38 . I think we can use it, but I'd need to
figure how to add a test for it in the configure script.
You should be able to get away without a configure script test --
#if __has_builtin(__builtin_bswap128)
/* version with the builtin here */
#else
/* fallback */
#endif
ought to work. (Any gcc new enough to have the builtin also has
__has_builtin; clang has had __has_builtin for ages; our compiler.h
defines a fallback "always 0" __has_builtin for older compilers.)
-- PMM