atomic: Fight with all the assemblers that don't like REP NOP. :/
diff --git a/src/atomic/SDL_spinlock.c b/src/atomic/SDL_spinlock.c
index f5e17d0..8630e66 100644
--- a/src/atomic/SDL_spinlock.c
+++ b/src/atomic/SDL_spinlock.c
@@ -122,12 +122,13 @@
/* "REP NOP" is PAUSE, coded for tools that don't know it by that name. */
#if (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
- #define PAUSE_INSTRUCTION() __asm__ __volatile__("rep nop\n")
+ #define PAUSE_INSTRUCTION() __asm__ __volatile__("pause\n") /* Clang lets you do REP NOP, GCC wants PAUSE. */
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
- #define PAUSE_INSRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. */
+ #define PAUSE_INSRUCTION() _mm_pause() /* this is actually "rep nop" and not a SIMD instruction. No inline asm in MSVC x86-64! */
#elif defined(__WATCOMC__) && defined(__386__)
+ /* watcom assembler won't let you do PAUSE, but refuses REP NOP as an invalid combination. Hardcode the bytes. */
extern _inline void PAUSE_INSTRUCTION(void);
- #pragma aux PAUSE_INSTRUCTION = "rep nop"
+ #pragma aux PAUSE_INSTRUCTION = "db 0f3h,90h"
#else
#define PAUSE_INSTRUCTION()
#endif
