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atomic: Use __atomic_thread_fence() when available

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This avoids requiring inline assembly for each architecture.

It also fixes some weakly ordered architectures which lacked
said inline assembly (RISC-V, MIPS, LoongArch, etc) and were
thus disasterously broken.
This commit is contained in:
Cameron Gutman
2026-04-23 18:25:38 -05:00
parent 9fa9edeadb
commit 2858a32723
1 changed files with 3 additions and 0 deletions
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include/SDL3/SDL_atomic.h
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@@ -275,6 +275,9 @@ extern SDL_DECLSPEC void SDLCALL SDL_MemoryBarrierAcquireFunction(void);
*/
#define SDL_MemoryBarrierAcquire() SDL_MemoryBarrierAcquireFunction()
#elif SDL_HAS_BUILTIN(__atomic_thread_fence) || (defined(__GNUC__) && (__GNUC__ >= 5))
#define SDL_MemoryBarrierRelease() __atomic_thread_fence(__ATOMIC_RELEASE)
#define SDL_MemoryBarrierAcquire() __atomic_thread_fence(__ATOMIC_ACQUIRE)
#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
#define SDL_MemoryBarrierRelease() __asm__ __volatile__ ("lwsync" : : : "memory")
#define SDL_MemoryBarrierAcquire() __asm__ __volatile__ ("lwsync" : : : "memory")