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meson: Detect atomic128 support with optimization

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There is an edge condition prior to gcc13 for which optimization
is required to generate 16-byte atomic sequences.  Detect this.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-05 11:34:58 +00:00
parent 35c653c402
commit e61f1efeb7
2 changed files with 59 additions and 22 deletions
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29
accel/tcg/ldst_atomicity.c.inc
View file

@ -16,6 +16,23 @@
#endif
#define HAVE_al8_fast (ATOMIC_REG_SIZE >= 8)
/*
* If __alignof(unsigned __int128) < 16, GCC may refuse to inline atomics
* that are supported by the host, e.g. s390x. We can force the pointer to
* have our known alignment with __builtin_assume_aligned, however prior to
* GCC 13 that was only reliable with optimization enabled. See
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107389
*/
#if defined(CONFIG_ATOMIC128_OPT)
# if !defined(__OPTIMIZE__)
# define ATTRIBUTE_ATOMIC128_OPT __attribute__((optimize("O1")))
# endif
# define CONFIG_ATOMIC128
#endif
#ifndef ATTRIBUTE_ATOMIC128_OPT
# define ATTRIBUTE_ATOMIC128_OPT
#endif
#if defined(CONFIG_ATOMIC128)
# define HAVE_al16_fast true
#else
@ -152,7 +169,8 @@ static inline uint64_t load_atomic8(void *pv)
*
* Atomically load 16 aligned bytes from @pv.
*/
static inline Int128 load_atomic16(void *pv)
static inline Int128 ATTRIBUTE_ATOMIC128_OPT
load_atomic16(void *pv)
{
#ifdef CONFIG_ATOMIC128
__uint128_t *p = __builtin_assume_aligned(pv, 16);
@ -356,7 +374,8 @@ static uint64_t load_atom_extract_al16_or_exit(CPUArchState *env, uintptr_t ra,
* cross an 16-byte boundary then the access must be 16-byte atomic,
* otherwise the access must be 8-byte atomic.
*/
static inline uint64_t load_atom_extract_al16_or_al8(void *pv, int s)
static inline uint64_t ATTRIBUTE_ATOMIC128_OPT
load_atom_extract_al16_or_al8(void *pv, int s)
{
#if defined(CONFIG_ATOMIC128)
uintptr_t pi = (uintptr_t)pv;
@ -692,7 +711,8 @@ static inline void store_atomic8(void *pv, uint64_t val)
*
* Atomically store 16 aligned bytes to @pv.
*/
static inline void store_atomic16(void *pv, Int128Alias val)
static inline void ATTRIBUTE_ATOMIC128_OPT
store_atomic16(void *pv, Int128Alias val)
{
#if defined(CONFIG_ATOMIC128)
__uint128_t *pu = __builtin_assume_aligned(pv, 16);
@ -790,7 +810,8 @@ static void store_atom_insert_al8(uint64_t *p, uint64_t val, uint64_t msk)
*
* Atomically store @val to @p masked by @msk.
*/
static void store_atom_insert_al16(Int128 *ps, Int128Alias val, Int128Alias msk)
static void ATTRIBUTE_ATOMIC128_OPT
store_atom_insert_al16(Int128 *ps, Int128Alias val, Int128Alias msk)
{
#if defined(CONFIG_ATOMIC128)
__uint128_t *pu, old, new;