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[thirdparty/glibc.git] / sysdeps / sparc / sparc64 / bits / atomic.h

diff --git a/sysdeps/sparc/sparc64/bits/atomic.h b/sysdeps/sparc/sparc64/bits/atomic.h
index 6170958f7af5d0f842851dd8e798a1951d007be2..ad9dae1d0fd761cfde4a8c6181195e8c954696e0 100644 (file)
--- a/sysdeps/sparc/sparc64/bits/atomic.h
+++ b/sysdeps/sparc/sparc64/bits/atomic.h
@@ -1,5 +1,5 @@
 /* Atomic operations.  sparc64 version.
-   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2003-2014 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
 
@@ -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) \