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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.
This commit is contained in:
Ulrich Drepper 1999-06-13 15:38:11 +00:00
parent ee77da07c9
commit 2e92188db9
3 changed files with 38 additions and 21 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
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.
1999-06-13 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* sysdeps/i386/fpu/bits/mathinline.h: Disable signbit* inline

7
NEWS
View File

@ -6,6 +6,13 @@ See the end for copying conditions.
Please send GNU C library bug reports using the `glibcbug' script to
<bugs@gnu.org>. Questions and suggestions should be send to
<bug-glibc@gnu.org>.
Version 2.2
* Thorsten Kukuk added secure mode support to nscd.
* Update from Berkeley db 2.7.5.
Version 2.1.1

41
sysdeps/powerpc/atomicity.h
View File

@ -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;
}