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atomic: let Clang always use atomic_load_n if available.

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(Apple's Clang reports itself as GCC 4.2.1 in preprocessor macros--the final
GNU C compiler Apple shipped--as of the macOS 10.12 SDK.)
This commit is contained in:
Ryan C. Gordon 2017-04-13 13:22:23 -04:00
parent 2bf79c2e0e
commit 8c00de57f6
1 changed files with 15 additions and 2 deletions
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17
src/atomic/SDL_atomic.c
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@ -35,6 +35,19 @@
#include <atomic.h>
#endif
/* The __atomic_load_n() intrinsic showed up in different times for different compilers. */
#if defined(HAVE_GCC_ATOMICS)
# if defined(__clang__)
# if __has_builtin(__atomic_load_n)
# define HAVE_ATOMIC_LOAD_N 1
# endif
# elif defined(__GNUC__)
# if (__GNUC__ >= 5)
# define HAVE_ATOMIC_LOAD_N 1
# endif
# endif
#endif
/*
If any of the operations are not provided then we must emulate some
of them. That means we need a nice implementation of spin locks
@ -211,7 +224,7 @@ SDL_AtomicAdd(SDL_atomic_t *a, int v)
int
SDL_AtomicGet(SDL_atomic_t *a)
{
#if defined(HAVE_GCC_ATOMICS) && (__GNUC__ >= 5)
#ifdef HAVE_ATOMIC_LOAD_N
return __atomic_load_n(&a->value, __ATOMIC_SEQ_CST);
#else
int value;
@ -225,7 +238,7 @@ SDL_AtomicGet(SDL_atomic_t *a)
void *
SDL_AtomicGetPtr(void **a)
{
#if defined(HAVE_GCC_ATOMICS) && (__GNUC__ >= 5)
#ifdef HAVE_ATOMIC_LOAD_N
return __atomic_load_n(a, __ATOMIC_SEQ_CST);
#else
void *value;