Fix asm constraint of compare_and_swap for clang-3.1/mips

(Apply commit 3e4c369 from 'master' branch.)

* src/atomic_ops/sysdeps/gcc/mips.h (AO_compare_and_swap): Use "+m"
asm constraint for *addr instead of "+R" (the letter is unsupported
by clang3.1 resulting in "invalid output constraint in asm" error).

Conflicts:

    src/atomic_ops/sysdeps/gcc/mips.h

1 files changed, 1 insertions, 1 deletions

diff --git a/src/atomic_ops/sysdeps/gcc/mips.h b/src/atomic_ops/sysdeps/gcc/mips.h
index 527a347..e09a558 100644
--- a/src/atomic_ops/sysdeps/gcc/mips.h
+++ b/src/atomic_ops/sysdeps/gcc/mips.h
@@ -59,7 +59,7 @@ AO_compare_and_swap(volatile AO_t *addr, AO_t old, AO_t new_val)
       "       beqz    %0, 1b      \n"
       "       li      %2, 1       \n"
       "2:                           "
-      : "=&r" (temp), "+R" (*addr), "+r" (was_equal)
+      : "=&r" (temp), "+m" (*addr), "+r" (was_equal)
       : "r" (new_val), "r" (old)
       : "memory");
   return was_equal;