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A lock prefix on xchg is meaningless.

This commit is contained in:
ad 2007-11-28 18:02:29 +00:00
parent 77724e6afd
commit 44fc0a18e5
2 changed files with 5 additions and 8 deletions
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5
common/lib/libc/arch/i386/atomic/atomic.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: atomic.S,v 1.2 2007/11/28 15:24:38 ad Exp $ */
/* $NetBSD: atomic.S,v 1.3 2007/11/28 18:02:29 ad Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -135,7 +135,6 @@ NENTRY(_atomic_or_32_nv)
NENTRY(_atomic_swap_32)
movl 4(%esp), %edx
movl 8(%esp), %eax
LOCK(11)
xchgl %eax, (%edx)
ret
@ -193,7 +192,7 @@ atomic_lockpatch:
.globl atomic_lockpatch
.long .Lpatch1, .Lpatch2, .Lpatch3, .Lpatch4, .Lpatch5
.long .Lpatch6, .Lpatch7, .Lpatch8, .Lpatch9, .Lpatch10
.long .Lpatch11, .Lpatch12, .Lpatch13, .Lpatch14, 0
.long .Lpatch12, .Lpatch13, .Lpatch14, 0
#endif /* _KERNEL */
ALIAS(atomic_add_32,_atomic_add_32)

8
common/lib/libc/arch/x86_64/atomic/atomic.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: atomic.S,v 1.2 2007/11/28 15:24:38 ad Exp $ */
/* $NetBSD: atomic.S,v 1.3 2007/11/28 18:02:29 ad Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -121,7 +121,6 @@ NENTRY(_atomic_or_32_nv)
ret
NENTRY(_atomic_swap_32)
LOCK(11)
xchgl %esi, (%rdi)
ret
@ -203,7 +202,6 @@ NENTRY(_atomic_or_64_nv)
ret
NENTRY(_atomic_swap_64)
LOCK(23)
xchgq %rsi, (%rdi)
ret
@ -261,9 +259,9 @@ atomic_lockpatch:
.globl atomic_lockpatch
.quad .Lpatch1, .Lpatch2, .Lpatch3, .Lpatch4, .Lpatch5
.quad .Lpatch6, .Lpatch7, .Lpatch8, .Lpatch9, .Lpatch10
.quad .Lpatch11, .Lpatch12, .Lpatch13, .Lpatch14, .Lpatch15
.quad .Lpatch12, .Lpatch13, .Lpatch14, .Lpatch15
.quad .Lpatch16, .Lpatch17, .Lpatch18, .Lpatch19, .Lpatch20
.quad .Lpatch21, .Lpatch22, .Lpatch23, .Lpatch24, .Lpatch25
.quad .Lpatch21, .Lpatch22, .Lpatch24, .Lpatch25
.quad .Lpatch26, 0
#endif /* _KERNEL */