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fix broken mips a_fetch_add

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sc was overwriting the result
This commit is contained in:
Rich Felker
2012-07-12 23:18:03 -04:00
parent 532cd3a717
commit 48d20136b0
1 changed files with 7 additions and 7 deletions
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arch/mips/atomic.h
+7 -7
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@@ -70,19 +70,19 @@ static inline int a_swap(volatile int *x, int v)
static inline int a_fetch_add(volatile int *x, int v)
{
int new;
int old, dummy;
__asm__ __volatile__(
".set push\n"
".set noreorder\n"
"1: ll %0, 0(%1)\n"
" addu %0, %0, %2\n"
" sc %0, 0(%1)\n"
" beq %0, $0, 1b\n"
"1: ll %0, 0(%2)\n"
" addu %1, %0, %3\n"
" sc %1, 0(%2)\n"
" beq %1, $0, 1b\n"
" nop\n"
"1: \n"
".set pop\n"
: "=&r"(new) : "r"(x), "r"(v) : "memory" );
return new-v;
: "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
return old;
}
static inline void a_inc(volatile int *x)