linux-atomic.c (__sync_val_compare_and_swap_4): Insert __builtin_expect().

2010-09-03  Marcus Shawcroft  <marcus.shawcroft@arm.com>

	* config/arm/linux-atomic.c (__sync_val_compare_and_swap_4): Insert __builtin_expect().
	(SUBWORD_VAL_CAS): Likewise.

From-SVN: r163805

diff --git a/gcc/config/arm/linux-atomic.c b/gcc/config/arm/linux-atomic.c
index 685f16b..ddedeb5 100644 (file)
--- a/gcc/config/arm/linux-atomic.c
+++ b/gcc/config/arm/linux-atomic.c
@@ -155,12 +155,12 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
     {
       actual_oldval = *ptr;
 
-      if (oldval != actual_oldval)
+      if (__builtin_expect (oldval != actual_oldval, 0))
        return actual_oldval;
 
       fail = __kernel_cmpxchg (actual_oldval, newval, ptr);
   
-      if (!fail)
+      if (__builtin_expect (!fail, 1))
         return oldval;
     }
 }
@@ -180,7 +180,8 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
       {                                                                        \
        actual_oldval = *wordptr;                                       \
                                                                        \
-       if (((actual_oldval & mask) >> shift) != (unsigned int) oldval) \
+       if (__builtin_expect (((actual_oldval & mask) >> shift) !=      \
+                              (unsigned int) oldval, 0))                \
           return (actual_oldval & mask) >> shift;                      \
                                                                        \
        actual_newval = (actual_oldval & ~mask)                         \
@@ -189,7 +190,7 @@ __sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
        fail = __kernel_cmpxchg (actual_oldval, actual_newval,          \
                                 wordptr);                              \
                                                                        \
-       if (!fail)                                                      \
+      if (__builtin_expect (!fail, 1))                                  \
           return oldval;                                               \
       }                                                                        \
   }