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(exchange_and_add): Use branch likely. 

(atomic_add): Likewise.
(compare_and_swap): Return 0 only when failed to compare. Use branch likely.
This commit is contained in:
Ulrich Drepper 2002-02-03 02:24:53 +00:00
parent c577723005
commit f295ff3212
1 changed files with 23 additions and 13 deletions
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36
sysdeps/mips/atomicity.h
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@ -33,11 +33,15 @@ exchange_and_add (volatile uint32_t *mem, int val)
__asm__ __volatile__
("/* Inline exchange & add */\n\t"
"ll %0,%3\n"
"1:\n\t"
"ll %0,%3\n\t"
"addu %1,%4,%0\n\t"
"sc %1,%2\n\t"
"beqz %1,1b\n\t"
".set push\n\t"
".set noreorder\n\t"
"beqzl %1,1b\n\t"
" ll %0,%3\n\t"
".set pop\n\t"
"/* End exchange & add */"
: "=&r"(result), "=&r"(tmp), "=m"(*mem)
: "m" (*mem), "r"(val)
@ -54,11 +58,15 @@ atomic_add (volatile uint32_t *mem, int val)
__asm__ __volatile__
("/* Inline atomic add */\n\t"
"ll %0,%2\n"
"1:\n\t"
"ll %0,%2\n\t"
"addu %0,%3,%0\n\t"
"sc %0,%1\n\t"
"beqz %0,1b\n\t"
".set push\n\t"
".set noreorder\n\t"
"beqzl %0,1b\n\t"
" ll %0,%2\n\t"
".set pop\n\t"
"/* End atomic add */"
: "=&r"(result), "=m"(*mem)
: "m" (*mem), "r"(val)
@ -69,22 +77,24 @@ static inline int
__attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
long int ret;
long int ret, temp;
__asm__ __volatile__
("/* Inline compare & swap */\n\t"
"ll %1,%5\n"
"1:\n\t"
"ll %0,%4\n\t"
".set push\n"
".set push\n\t"
".set noreorder\n\t"
"bne %0,%2,2f\n\t"
"move %0,%3\n\t"
".set pop\n\t"
"sc %0,%1\n\t"
"beqz %0,1b\n"
"bne %1,%3,2f\n\t"
" move %0,$0\n\t"
"move %0,%4\n\t"
"sc %0,%2\n\t"
"beqzl %0,1b\n\t"
" ll %1,%5\n\t"
".set pop\n"
"2:\n\t"
"/* End compare & swap */"
: "=&r" (ret), "=m" (*p)
: "=&r" (ret), "=&r" (temp), "=m" (*p)
: "r" (oldval), "r" (newval), "m" (*p)
: "memory");