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Add a minor 'cas' atomic optimization on sparc. 

* sysdeps/sparc/sparc32/sparcv9/bits/atomic.h
	(__arch_compare_and_exchange_val_32_acq): Use %g0 as second
	argument of CAS if possible.
	* sysdeps/sparc/sparc64/bits/atomic.h
	(__arch_compare_and_exchange_val_32_acq): Likewise.
	(__arch_compare_and_exchange_val_64_acq): Likewise.
This commit is contained in:
David S. Miller 2013-01-23 11:27:24 -08:00
parent 67b3f58c83
commit bae8e7f5ed
3 changed files with 39 additions and 12 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2013-01-23 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/sparc32/sparcv9/bits/atomic.h
(__arch_compare_and_exchange_val_32_acq): Use %g0 as second
argument of CAS if possible.
* sysdeps/sparc/sparc64/bits/atomic.h
(__arch_compare_and_exchange_val_32_acq): Likewise.
(__arch_compare_and_exchange_val_64_acq): Likewise.
2013-01-23 Pino Toscano <toscano.pino@tiscali.it>
* sysdeps/unix/sysv/linux/ulimit.c: Moved to ...

6
sysdeps/sparc/sparc32/sparcv9/bits/atomic.h
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@ -55,6 +55,12 @@ typedef uintmax_t uatomic_max_t;
({ \
__typeof (*(mem)) __acev_tmp; \
__typeof (mem) __acev_mem = (mem); \
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), \

12
sysdeps/sparc/sparc64/bits/atomic.h
View File

@ -55,6 +55,12 @@ typedef uintmax_t uatomic_max_t;
({ \
__typeof (*(mem)) __acev_tmp; \
__typeof (mem) __acev_mem = (mem); \
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), \
@ -65,6 +71,12 @@ typedef uintmax_t uatomic_max_t;
({ \
__typeof (*(mem)) __acev_tmp; \
__typeof (mem) __acev_mem = (mem); \
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), \