sanitizer_atomic_clang_x86.h [plain text]
#ifndef SANITIZER_ATOMIC_CLANG_X86_H
#define SANITIZER_ATOMIC_CLANG_X86_H
namespace __sanitizer {
INLINE void proc_yield(int cnt) {
__asm__ __volatile__("" ::: "memory");
for (int i = 0; i < cnt; i++)
__asm__ __volatile__("pause");
__asm__ __volatile__("" ::: "memory");
}
template<typename T>
INLINE typename T::Type atomic_load(
const volatile T *a, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_consume
| memory_order_acquire | memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
typename T::Type v;
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
if (mo == memory_order_relaxed) {
v = a->val_dont_use;
} else if (mo == memory_order_consume) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
} else if (mo == memory_order_acquire) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
} else { __asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
}
} else {
__asm__ __volatile__(
"movq %1, %%mm0;" "movq %%mm0, %0;" "emms;" : "=m" (v)
: "m" (a->val_dont_use)
: "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)",
#ifdef __MMX__
"mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7",
#endif // #ifdef __MMX__
"memory");
}
return v;
}
template<typename T>
INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_release
| memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
if (mo == memory_order_relaxed) {
a->val_dont_use = v;
} else if (mo == memory_order_release) {
__asm__ __volatile__("" ::: "memory");
a->val_dont_use = v;
__asm__ __volatile__("" ::: "memory");
} else { __asm__ __volatile__("" ::: "memory");
a->val_dont_use = v;
__sync_synchronize();
}
} else {
__asm__ __volatile__(
"movq %1, %%mm0;" "movq %%mm0, %0;"
"emms;" : "=m" (a->val_dont_use)
: "m" (v)
: "st", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)",
#ifdef __MMX__
"mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7",
#endif // #ifdef __MMX__
"memory");
if (mo == memory_order_seq_cst)
__sync_synchronize();
}
}
}
#endif // #ifndef SANITIZER_ATOMIC_CLANG_X86_H