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meson: Split test for __int128_t type from __int128_t arithmetic

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Older versions of clang have missing runtime functions for arithmetic
with -fsanitize=undefined (see 464e3671f9), so we cannot use
__int128_t for implementing Int128.  But __int128_t is present,
data movement works, and it can be used for atomic128.

Probe for both CONFIG_INT128_TYPE and CONFIG_INT128, adjust
qemu/int128.h to define Int128Alias if CONFIG_INT128_TYPE,
and adjust the meson probe for atomics to use has_int128_type.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-24 08:14:41 -07:00
parent 9e0e6a7e8e
commit 6479dd74f1
2 changed files with 12 additions and 7 deletions
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4
include/qemu/int128.h
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@ -481,7 +481,7 @@ static inline void bswap128s(Int128 *s)
* a possible structure and the native types. Ease parameter passing
* via use of the transparent union extension.
*/
#ifdef CONFIG_INT128
#ifdef CONFIG_INT128_TYPE
typedef union {
__uint128_t u;
__int128_t i;
@ -489,6 +489,6 @@ typedef union {
} Int128Alias __attribute__((transparent_union));
#else
typedef Int128 Int128Alias;
#endif /* CONFIG_INT128 */
#endif /* CONFIG_INT128_TYPE */
#endif /* INT128_H */