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Memory barrier in respect of the CAS isn't necessary.

This commit is contained in:
ad 2007-11-28 16:59:09 +00:00
parent efe797dc32
commit 13c86772e9
14 changed files with 14 additions and 54 deletions
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5
common/lib/libc/atomic/atomic_add_32_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_add_32_cas.c,v 1.2 2007/11/28 16:54:58 ad Exp $ */ /* $NetBSD: atomic_add_32_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_add_32(volatile uint32_t *addr, int32_t val) atomic_add_32(volatile uint32_t *addr, int32_t val)
@ -47,9 +46,7 @@ atomic_add_32(volatile uint32_t *addr, int32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old + val; new = old + val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_add_32_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_add_32_nv_cas.c,v 1.2 2007/11/28 16:54:58 ad Exp $ */ /* $NetBSD: atomic_add_32_nv_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint32_t uint32_t
atomic_add_32_nv(volatile uint32_t *addr, int32_t val) atomic_add_32_nv(volatile uint32_t *addr, int32_t val)
@ -47,9 +46,7 @@ atomic_add_32_nv(volatile uint32_t *addr, int32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old + val; new = old + val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);

5
common/lib/libc/atomic/atomic_add_64_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_add_64_cas.c,v 1.2 2007/11/28 16:54:59 ad Exp $ */ /* $NetBSD: atomic_add_64_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_add_64(volatile uint64_t *addr, int64_t val) atomic_add_64(volatile uint64_t *addr, int64_t val)
@ -47,9 +46,7 @@ atomic_add_64(volatile uint64_t *addr, int64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old + val; new = old + val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_add_64_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_add_64_nv_cas.c,v 1.2 2007/11/28 16:54:59 ad Exp $ */ /* $NetBSD: atomic_add_64_nv_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint64_t uint64_t
atomic_add_64_nv(volatile uint64_t *addr, int64_t val) atomic_add_64_nv(volatile uint64_t *addr, int64_t val)
@ -47,9 +46,7 @@ atomic_add_64_nv(volatile uint64_t *addr, int64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old + val; new = old + val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);

5
common/lib/libc/atomic/atomic_and_32_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_and_32_cas.c,v 1.2 2007/11/28 16:55:00 ad Exp $ */ /* $NetBSD: atomic_and_32_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_and_32(volatile uint32_t *addr, uint32_t val) atomic_and_32(volatile uint32_t *addr, uint32_t val)
@ -47,9 +46,7 @@ atomic_and_32(volatile uint32_t *addr, uint32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old & val; new = old & val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_and_32_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_and_32_nv_cas.c,v 1.2 2007/11/28 16:55:00 ad Exp $ */ /* $NetBSD: atomic_and_32_nv_cas.c,v 1.3 2007/11/28 16:59:09 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint32_t uint32_t
atomic_and_32_nv(volatile uint32_t *addr, uint32_t val) atomic_and_32_nv(volatile uint32_t *addr, uint32_t val)
@ -47,9 +46,7 @@ atomic_and_32_nv(volatile uint32_t *addr, uint32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old & val; new = old & val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);

5
common/lib/libc/atomic/atomic_and_64_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_and_64_cas.c,v 1.2 2007/11/28 16:55:01 ad Exp $ */ /* $NetBSD: atomic_and_64_cas.c,v 1.3 2007/11/28 16:59:10 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_and_64(volatile uint64_t *addr, uint64_t val) atomic_and_64(volatile uint64_t *addr, uint64_t val)
@ -47,9 +46,7 @@ atomic_and_64(volatile uint64_t *addr, uint64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old & val; new = old & val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_and_64_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_and_64_nv_cas.c,v 1.2 2007/11/28 16:55:01 ad Exp $ */ /* $NetBSD: atomic_and_64_nv_cas.c,v 1.3 2007/11/28 16:59:10 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint64_t uint64_t
atomic_and_64_nv(volatile uint64_t *addr, uint64_t val) atomic_and_64_nv(volatile uint64_t *addr, uint64_t val)
@ -47,9 +46,7 @@ atomic_and_64_nv(volatile uint64_t *addr, uint64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old & val; new = old & val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);

5
common/lib/libc/atomic/atomic_or_32_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_or_32_cas.c,v 1.2 2007/11/28 16:55:08 ad Exp $ */ /* $NetBSD: atomic_or_32_cas.c,v 1.3 2007/11/28 16:59:10 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_or_32(volatile uint32_t *addr, uint32_t val) atomic_or_32(volatile uint32_t *addr, uint32_t val)
@ -47,9 +46,7 @@ atomic_or_32(volatile uint32_t *addr, uint32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old | val; new = old | val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_or_32_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_or_32_nv_cas.c,v 1.2 2007/11/28 16:55:09 ad Exp $ */ /* $NetBSD: atomic_or_32_nv_cas.c,v 1.3 2007/11/28 16:59:10 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint32_t uint32_t
atomic_or_32_nv(volatile uint32_t *addr, uint32_t val) atomic_or_32_nv(volatile uint32_t *addr, uint32_t val)
@ -47,9 +46,7 @@ atomic_or_32_nv(volatile uint32_t *addr, uint32_t val)
uint32_t old, new; uint32_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old | val; new = old | val;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);

5
common/lib/libc/atomic/atomic_or_64_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_or_64_cas.c,v 1.2 2007/11/28 16:55:09 ad Exp $ */ /* $NetBSD: atomic_or_64_cas.c,v 1.3 2007/11/28 16:59:10 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
void void
atomic_or_64(volatile uint64_t *addr, uint64_t val) atomic_or_64(volatile uint64_t *addr, uint64_t val)
@ -47,9 +46,7 @@ atomic_or_64(volatile uint64_t *addr, uint64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old | val; new = old | val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);
} }

5
common/lib/libc/atomic/atomic_or_64_nv_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_or_64_nv_cas.c,v 1.2 2007/11/28 16:55:10 ad Exp $ */ /* $NetBSD: atomic_or_64_nv_cas.c,v 1.3 2007/11/28 16:59:11 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint64_t uint64_t
atomic_or_64_nv(volatile uint64_t *addr, uint64_t val) atomic_or_64_nv(volatile uint64_t *addr, uint64_t val)
@ -47,9 +46,7 @@ atomic_or_64_nv(volatile uint64_t *addr, uint64_t val)
uint64_t old, new; uint64_t old, new;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
new = old | val; new = old | val;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);

4
common/lib/libc/atomic/atomic_swap_32_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_swap_32_cas.c,v 1.2 2007/11/28 16:55:11 ad Exp $ */ /* $NetBSD: atomic_swap_32_cas.c,v 1.3 2007/11/28 16:59:11 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint32_t uint32_t
atomic_swap_32(volatile uint32_t *addr, uint32_t new) atomic_swap_32(volatile uint32_t *addr, uint32_t new)
@ -47,7 +46,6 @@ atomic_swap_32(volatile uint32_t *addr, uint32_t new)
uint32_t old; uint32_t old;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
} while (atomic_cas_32(addr, old, new) != old); } while (atomic_cas_32(addr, old, new) != old);

4
common/lib/libc/atomic/atomic_swap_64_cas.c
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@ -1,4 +1,4 @@
/* $NetBSD: atomic_swap_64_cas.c,v 1.2 2007/11/28 16:55:11 ad Exp $ */ /* $NetBSD: atomic_swap_64_cas.c,v 1.3 2007/11/28 16:59:11 ad Exp $ */
/*- /*-
* Copyright (c) 2007 The NetBSD Foundation, Inc. * Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -39,7 +39,6 @@
#include "atomic_op_namespace.h" #include "atomic_op_namespace.h"
#include <sys/atomic.h> #include <sys/atomic.h>
#include "atomic_op_cas_impl.h"
uint64_t uint64_t
atomic_swap_64(volatile uint64_t *addr, uint64_t new) atomic_swap_64(volatile uint64_t *addr, uint64_t new)
@ -47,7 +46,6 @@ atomic_swap_64(volatile uint64_t *addr, uint64_t new)
uint64_t old; uint64_t old;
do { do {
OP_READ_BARRIER;
old = *addr; old = *addr;
} while (atomic_cas_64(addr, old, new) != old); } while (atomic_cas_64(addr, old, new) != old);