diff options
Diffstat (limited to 'sysdeps/sparc/sparc64/bits/atomic.h')
| -rw-r--r-- | sysdeps/sparc/sparc64/bits/atomic.h | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/sysdeps/sparc/sparc64/bits/atomic.h b/sysdeps/sparc/sparc64/bits/atomic.h index 0afbb4ba5e..96611de42f 100644 --- a/sysdeps/sparc/sparc64/bits/atomic.h +++ b/sysdeps/sparc/sparc64/bits/atomic.h @@ -55,20 +55,32 @@ typedef uintmax_t uatomic_max_t; ({ \ __typeof (*(mem)) __acev_tmp; \ __typeof (mem) __acev_mem = (mem); \ - __asm __volatile ("cas [%4], %2, %0" \ - : "=r" (__acev_tmp), "=m" (*__acev_mem) \ - : "r" (oldval), "m" (*__acev_mem), "r" (__acev_mem), \ - "0" (newval) : "memory"); \ + if (__builtin_constant_p (oldval) && (oldval) == 0) \ + __asm __volatile ("cas [%3], %%g0, %0" \ + : "=r" (__acev_tmp), "=m" (*__acev_mem) \ + : "m" (*__acev_mem), "r" (__acev_mem), \ + "0" (newval) : "memory"); \ + else \ + __asm __volatile ("cas [%4], %2, %0" \ + : "=r" (__acev_tmp), "=m" (*__acev_mem) \ + : "r" (oldval), "m" (*__acev_mem), "r" (__acev_mem), \ + "0" (newval) : "memory"); \ __acev_tmp; }) #define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __acev_tmp; \ __typeof (mem) __acev_mem = (mem); \ - __asm __volatile ("casx [%4], %2, %0" \ - : "=r" (__acev_tmp), "=m" (*__acev_mem) \ - : "r" ((long) (oldval)), "m" (*__acev_mem), \ - "r" (__acev_mem), "0" ((long) (newval)) : "memory"); \ + if (__builtin_constant_p (oldval) && (oldval) == 0) \ + __asm __volatile ("casx [%3], %%g0, %0" \ + : "=r" (__acev_tmp), "=m" (*__acev_mem) \ + : "m" (*__acev_mem), "r" (__acev_mem), \ + "0" ((long) (newval)) : "memory"); \ + else \ + __asm __volatile ("casx [%4], %2, %0" \ + : "=r" (__acev_tmp), "=m" (*__acev_mem) \ + : "r" ((long) (oldval)), "m" (*__acev_mem), \ + "r" (__acev_mem), "0" ((long) (newval)) : "memory"); \ __acev_tmp; }) #define atomic_exchange_acq(mem, newvalue) \ |