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[PATCH] AVR32: Fix oversize immediates in atomic.h

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When calling e.g. atomic_sub_return with a large constant, the
compiler may output an immediate that is too large for the sub
instruction in the middle of the loop.

Fix this by explicitly specifying the number of bits allowed in the
constraint. Also stop atomic_add_return() and friends from falling
back to their respective "sub" variants if the constant is too large
to fit in an immediate.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Haavard Skinnemoen 2006-10-24 10:12:42 +02:00 committed by Linus Torvalds
parent bee8ce809f
commit fa3522407f
1 changed files with 4 additions and 4 deletions
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8
include/asm-avr32/atomic.h
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@ -41,7 +41,7 @@ static inline int atomic_sub_return(int i, atomic_t *v)
" stcond %1, %0\n" " stcond %1, %0\n"
" brne 1b" " brne 1b"
: "=&r"(result), "=o"(v->counter) : "=&r"(result), "=o"(v->counter)
: "m"(v->counter), "ir"(i) : "m"(v->counter), "rKs21"(i)
: "cc"); : "cc");
return result; return result;
@ -58,7 +58,7 @@ static inline int atomic_add_return(int i, atomic_t *v)
{ {
int result; int result;
if (__builtin_constant_p(i)) if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576))
result = atomic_sub_return(-i, v); result = atomic_sub_return(-i, v);
else else
asm volatile( asm volatile(
@ -101,7 +101,7 @@ static inline int atomic_sub_unless(atomic_t *v, int a, int u)
" mov %1, 1\n" " mov %1, 1\n"
"1:" "1:"
: "=&r"(tmp), "=&r"(result), "=o"(v->counter) : "=&r"(tmp), "=&r"(result), "=o"(v->counter)
: "m"(v->counter), "ir"(a), "ir"(u) : "m"(v->counter), "rKs21"(a), "rKs21"(u)
: "cc", "memory"); : "cc", "memory");
return result; return result;
@ -121,7 +121,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
{ {
int tmp, result; int tmp, result;
if (__builtin_constant_p(a)) if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
result = atomic_sub_unless(v, -a, u); result = atomic_sub_unless(v, -a, u);
else { else {
result = 0; result = 0;