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libobs/util: ARM atomic fixes 

Use native instructions on ARM64 (dmb is slow).

Use magic number for 32-bit ARM since _ARM64_BARRIER_ISH is for ARM64.
master
jpark37 2021-02-03 21:53:56 -08:00 committed by Jim
parent f0ad7a92cd
commit 3df4a1109c
1 changed files with 25 additions and 10 deletions
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35
libobs/util/threading-windows.h
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@ -36,10 +36,12 @@ 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_ARM) || defined(_M_ARM64)
__dmb(_ARM64_BARRIER_ISH);
#if defined(_M_ARM64)
__stlr32((volatile unsigned *)ptr, val);
#elif defined(_M_ARM)
__dmb(0xB);
__iso_volatile_store32((volatile __int32 *)ptr, val);
__dmb(_ARM64_BARRIER_ISH);
__dmb(0xB);
#else
_InterlockedExchange(ptr, val);
#endif
@ -57,13 +59,17 @@ 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);
#else
const long val = __iso_volatile_load32((const volatile __int32 *)ptr);
#if defined(_M_ARM) || defined(_M_ARM64)
__dmb(_ARM64_BARRIER_ISH);
#if defined(_M_ARM)
__dmb(0xB);
#else
_ReadWriteBarrier();
#endif
return val;
#endif
}
static inline bool os_atomic_compare_swap_long(volatile long *val, long old_val,
@ -84,10 +90,12 @@ 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_ARM) || defined(_M_ARM64)
__dmb(_ARM64_BARRIER_ISH);
#if defined(_M_ARM64)
__stlr8((volatile unsigned char *)ptr, val);
#elif defined(_M_ARM)
__dmb(0xB);
__iso_volatile_store8((volatile char *)ptr, val);
__dmb(_ARM64_BARRIER_ISH);
__dmb(0xB);
#else
_InterlockedExchange8((volatile char *)ptr, (char)val);
#endif
@ -111,11 +119,18 @@ static inline bool os_atomic_exchange_bool(volatile bool *ptr, bool val)
static inline bool os_atomic_load_bool(const volatile bool *ptr)
{
#if defined(_M_ARM64)
const unsigned char u = __ldar8((volatile unsigned char *)ptr);
bool b;
memcpy(&b, &u, sizeof(b));
return b;
#else
const char val = __iso_volatile_load8((const volatile char *)ptr);
#if defined(_M_ARM) || defined(_M_ARM64)
__dmb(_ARM64_BARRIER_ISH);
#if defined(_M_ARM)
__dmb(0xB);
#else
_ReadWriteBarrier();
#endif
return val;
#endif
}