lkml.org 
[lkml]   [2006]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4/8] AVR32: Fix oversize immediates in atomic.h
Date
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>
---
include/asm-avr32/atomic.h | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/asm-avr32/atomic.h b/include/asm-avr32/atomic.h
index e0b9c44..c40b603 100644
--- a/include/asm-avr32/atomic.h
+++ b/include/asm-avr32/atomic.h
@@ -41,7 +41,7 @@ static inline int atomic_sub_return(int
" stcond %1, %0\n"
" brne 1b"
: "=&r"(result), "=o"(v->counter)
- : "m"(v->counter), "ir"(i)
+ : "m"(v->counter), "rKs21"(i)
: "cc");

return result;
@@ -58,7 +58,7 @@ static inline int atomic_add_return(int
{
int result;

- if (__builtin_constant_p(i))
+ if (__builtin_constant_p(i) && (i >= -1048575) && (i <= 1048576))
result = atomic_sub_return(-i, v);
else
asm volatile(
@@ -101,7 +101,7 @@ static inline int atomic_sub_unless(atom
" mov %1, 1\n"
"1:"
: "=&r"(tmp), "=&r"(result), "=o"(v->counter)
- : "m"(v->counter), "ir"(a), "ir"(u)
+ : "m"(v->counter), "rKs21"(a), "rKs21"(u)
: "cc", "memory");

return result;
@@ -121,7 +121,7 @@ static inline int atomic_add_unless(atom
{
int tmp, result;

- if (__builtin_constant_p(a))
+ if (__builtin_constant_p(a) && (a >= -1048575) && (a <= 1048576))
result = atomic_sub_unless(v, -a, u);
else {
result = 0;
--
1.4.1.1
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-24 10:19    [W:0.043 / U:1.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site