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Make contended mutexes 30% faster on aarch64

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On Raspberry Pi 5, benchmark_mu_contended takes 359µs in *NSYNC upstream
and in Cosmopolitan it takes 272µs.
This commit is contained in:
Justine Tunney 2024-09-26 09:17:51 -07:00
parent 70603fa6ea
commit 12cc2de22e
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GPG key ID: BE714B4575D6E328
4 changed files with 81 additions and 57 deletions
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8
third_party/nsync/atomic.internal.h vendored
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@ -85,13 +85,6 @@ static inline int atm_cas_relacq_u32_(nsync_atomic_uint32_ *p, uint32_t o,
memory_order_relaxed);
}
static inline int atm_cas_seqcst_u32_(nsync_atomic_uint32_ *p, uint32_t o,
uint32_t n) {
return atomic_compare_exchange_strong_explicit(NSYNC_ATOMIC_UINT32_PTR_(p),
&o, n, memory_order_seq_cst,
memory_order_relaxed);
}
#define ATM_CAS_HELPER_(barrier, p, o, n) \
(atm_cas_##barrier##_u32_((p), (o), (n)))
@ -99,7 +92,6 @@ static inline int atm_cas_seqcst_u32_(nsync_atomic_uint32_ *p, uint32_t o,
#define ATM_CAS_ACQ(p, o, n) ATM_CAS_HELPER_(acq, (p), (o), (n))
#define ATM_CAS_REL(p, o, n) ATM_CAS_HELPER_(rel, (p), (o), (n))
#define ATM_CAS_RELACQ(p, o, n) ATM_CAS_HELPER_(relacq, (p), (o), (n))
#define ATM_CAS_SEQCST(p, o, n) ATM_CAS_HELPER_(seqcst, (p), (o), (n))
/* Need a cast to remove "const" from some uses. */
#define ATM_LOAD(p) \