diff options
| author | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2013-03-03 17:10:55 +0000 |
|---|---|---|
| committer | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2013-03-03 17:10:55 +0000 |
| commit | d15f124ff59606604c0243ee19cd67bc99ecd09f (patch) | |
| tree | f0b18e431b15b797d5f5dc980928cd1a26b8f74a /libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h | |
| parent | c1078e9067234e88d5c1ca8af18ae67b64141d66 (diff) | |
Merge changes between r22241 and r22552 from /fsf/trunk.
git-svn-id: svn://svn.eglibc.org/trunk@22553 7b3dc134-2b1b-0410-93df-9e9f96275f8d
Diffstat (limited to 'libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h')
| -rw-r--r-- | libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h b/libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h index b1a89584f..937d7a149 100644 --- a/libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h +++ b/libc/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h @@ -55,10 +55,16 @@ 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; }) /* This can be implemented if needed. */ |