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libobs/util: Compiler barriers for ARM64 atomics

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Unsure if the intrinsics imply ordering. Safer to assume they don't.
This commit is contained in:
jpark37 2021-03-06 20:46:42 -08:00 committed by Jim
parent eb98505a2c
commit a20b4c67eb
1 changed files with 10 additions and 3 deletions
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13
libobs/util/threading-windows.h
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@ -37,7 +37,9 @@ static inline long os_atomic_dec_long(volatile long *val)
static inline void os_atomic_store_long(volatile long *ptr, long val)
{
#if defined(_M_ARM64)
_ReadWriteBarrier();
__stlr32((volatile unsigned *)ptr, val);
_ReadWriteBarrier();
#elif defined(_M_ARM)
__dmb(_ARM_BARRIER_ISH);
__iso_volatile_store32((volatile __int32 *)ptr, val);
@ -60,16 +62,18 @@ static inline long os_atomic_exchange_long(volatile long *ptr, long val)
static inline long os_atomic_load_long(const volatile long *ptr)
{
#if defined(_M_ARM64)
return __ldar32((volatile unsigned *)ptr);
const long val = __ldar32((volatile unsigned *)ptr);
#else
const long val = __iso_volatile_load32((const volatile __int32 *)ptr);
#endif
#if defined(_M_ARM)
__dmb(_ARM_BARRIER_ISH);
#else
_ReadWriteBarrier();
#endif
return val;
#endif
}
static inline bool os_atomic_compare_swap_long(volatile long *val, long old_val,
@ -91,7 +95,9 @@ static inline bool os_atomic_compare_exchange_long(volatile long *val,
static inline void os_atomic_store_bool(volatile bool *ptr, bool val)
{
#if defined(_M_ARM64)
_ReadWriteBarrier();
__stlr8((volatile unsigned char *)ptr, val);
_ReadWriteBarrier();
#elif defined(_M_ARM)
__dmb(_ARM_BARRIER_ISH);
__iso_volatile_store8((volatile char *)ptr, val);
@ -125,11 +131,12 @@ static inline bool os_atomic_load_bool(const volatile bool *ptr)
const unsigned char c = __ldar8((volatile unsigned char *)ptr);
#else
const char c = __iso_volatile_load8((const volatile char *)ptr);
#endif
#if defined(_M_ARM)
__dmb(_ARM_BARRIER_ISH);
#else
_ReadWriteBarrier();
#endif
#endif
/* Avoid unnecesary char to bool conversion. Value known 0 or 1. */