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Implement PAUSE_INSTRUCTION() for Windows ARM platforms

This commit is contained in:
Cameron Gutman 2021-01-02 13:43:04 -06:00
parent 6f9e18da2a
commit 59594a7891
1 changed files with 2 additions and 0 deletions
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2
src/atomic/SDL_spinlock.c
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@ -144,6 +144,8 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
#define PAUSE_INSTRUCTION() __asm__ __volatile__("or 27,27,27"); #define PAUSE_INSTRUCTION() __asm__ __volatile__("or 27,27,27");
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
#define PAUSE_INSTRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. No inline asm in MSVC x86-64! */ #define PAUSE_INSTRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. No inline asm in MSVC x86-64! */
#elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_ARM64))
#define PAUSE_INSTRUCTION() __yield()
#elif defined(__WATCOMC__) && defined(__386__) #elif defined(__WATCOMC__) && defined(__386__)
/* watcom assembler rejects PAUSE if CPU < i686, and it refuses REP NOP as an invalid combination. Hardcode the bytes. */ /* watcom assembler rejects PAUSE if CPU < i686, and it refuses REP NOP as an invalid combination. Hardcode the bytes. */
extern _inline void PAUSE_INSTRUCTION(void); extern _inline void PAUSE_INSTRUCTION(void);