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include/qemu/int128.h: introduce bswap128s

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Changes the current bswap128 implementation to use __builtin_bswap128
when available, adds a bswap128 implementation for !CONFIG_INT128
builds, and introduces bswap128s based on bswap128.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210826145656.2507213-2-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Matheus Ferst 2021-08-26 11:56:55 -03:00 committed by David Gibson
parent f297c4c605
commit 2484cd9c77
1 changed files with 16 additions and 1 deletions
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17
include/qemu/int128.h
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@ -1,9 +1,9 @@
#ifndef INT128_H #ifndef INT128_H
#define INT128_H #define INT128_H
#ifdef CONFIG_INT128
#include "qemu/bswap.h" #include "qemu/bswap.h"
#ifdef CONFIG_INT128
typedef __int128_t Int128; typedef __int128_t Int128;
static inline Int128 int128_make64(uint64_t a) static inline Int128 int128_make64(uint64_t a)
@ -155,7 +155,11 @@ static inline void int128_subfrom(Int128 *a, Int128 b)
static inline Int128 bswap128(Int128 a) static inline Int128 bswap128(Int128 a)
{ {
#if __has_builtin(__builtin_bswap128)
return __builtin_bswap128(a);
#else
return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a))); return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a)));
#endif
} }
#else /* !CONFIG_INT128 */ #else /* !CONFIG_INT128 */
@ -350,5 +354,16 @@ static inline void int128_subfrom(Int128 *a, Int128 b)
*a = int128_sub(*a, b); *a = int128_sub(*a, b);
} }
static inline Int128 bswap128(Int128 a)
{
return int128_make128(bswap64(a.hi), bswap64(a.lo));
}
#endif /* CONFIG_INT128 */ #endif /* CONFIG_INT128 */
static inline void bswap128s(Int128 *s)
{
*s = bswap128(*s);
}
#endif /* INT128_H */ #endif /* INT128_H */