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authorUlrich Drepper <drepper@redhat.com>1999-06-13 15:38:11 +0000
committerUlrich Drepper <drepper@redhat.com>1999-06-13 15:38:11 +0000
commit2e92188db9129756d7be46cfa0d53d900e3d1135 (patch)
tree66f15d319e1716fb8102023c462471437a02e347 /sysdeps
parentee77da07c9c0fef52f8f1d9d63944441e99655f9 (diff)
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Update.
1999-06-13 Geoff Keating <geoffk@ozemail.com.au> * sysdeps/powerpc/atomicity.h (exchange_and_add): Remove `volatile'; add `memory' clobber; optimise for constant `val'. (atomic_add): Likewise. (test_and_set): Remove `volatile'; add `memory' clobber; be more like the original `test_and_set'. (compare_and_swap): Remove `volatile'; add `memory' clobber; optimise for constant `oldval'. (always_swap): Remove `volatile'; add `memory' clobber.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/powerpc/atomicity.h41
1 files changed, 20 insertions, 21 deletions
diff --git a/sysdeps/powerpc/atomicity.h b/sysdeps/powerpc/atomicity.h
index 5b56532779..bb5f49133a 100644
--- a/sysdeps/powerpc/atomicity.h
+++ b/sysdeps/powerpc/atomicity.h
@@ -1,5 +1,5 @@
/* Low-level functions for atomic operations. PowerPC version.
- Copyright (C) 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -33,12 +33,12 @@ __attribute__ ((unused))
exchange_and_add (volatile uint32_t *mem, int val)
{
int tmp, result;
- __asm__ __volatile__ ("\
+ __asm__ ("\
0: lwarx %0,0,%2
- add %1,%3,%0
+ add%I3 %1,%0,%3
stwcx. %1,0,%2
bne- 0b
-" : "=&r"(result), "=&r"(tmp) : "r" (mem), "r"(val) : "cr0");
+" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
return result;
}
@@ -47,12 +47,12 @@ __attribute__ ((unused))
atomic_add (volatile uint32_t *mem, int val)
{
int tmp;
- __asm__ __volatile__("\
+ __asm__ ("\
0: lwarx %0,0,%1
- add %0,%2,%0
+ add%I2 %0,%0,%2
stwcx. %0,0,%1
bne- 0b
-" : "=&r"(tmp) : "r" (mem), "r"(val) : "cr0");
+" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
}
static __ATOMICITY_INLINE int
@@ -60,16 +60,16 @@ __attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
int result;
- __asm__ __volatile__ ("\
+ __asm__ ("\
0: lwarx %0,0,%1
- xor. %0,%0,%2
+ sub%I2c. %0,%0,%2
cntlzw %0,%0
bne- 1f
stwcx. %3,0,%1
bne- 0b
-1: srwi %0,%0,5
-" : "=&r"(result) : "r"(p), "r"(oldval), "r"(newval) : "cr0");
- return result;
+1:
+" : "=&b"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory");
+ return result >> 5;
}
static __ATOMICITY_INLINE long int
@@ -77,28 +77,27 @@ __attribute__ ((unused))
always_swap (volatile long int *p, long int newval)
{
long int result;
- __asm__ __volatile__ ("\
+ __asm__ ("\
0: lwarx %0,0,%1
stwcx. %2,0,%1
bne- 0b
-" : "=&r"(result) : "r"(p), "r"(newval) : "cr0");
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
return result;
}
static __ATOMICITY_INLINE int
__attribute__ ((unused))
-test_and_set (volatile long int *p, long int oldval, long int newval)
+test_and_set (volatile long int *p, long int newval)
{
int result;
- __asm__ __volatile__ ("\
+ __asm__ ("\
0: lwarx %0,0,%1
- xor. %0,%0,%2
- cntlzw %0,%0
+ cmpwi %0,0
bne- 1f
- stwcx. %3,0,%1
+ stwcx. %2,0,%1
bne- 0b
-1: srwi %0,%0,5
-" : "=&r"(result) : "r"(p), "r"(oldval), "r"(newval) : "cr0");
+1:
+" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
return result;
}