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Tweak to shave off a few cycles.

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This commit is contained in:
uwe 2007-03-14 05:38:28 +00:00
parent e7b9466d99
commit ecde82d887
1 changed files with 17 additions and 16 deletions
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33
sys/arch/sh3/sh3/lock_stubs.S
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@ -1,4 +1,4 @@
/* $NetBSD: lock_stubs.S,v 1.6 2007/03/14 05:03:52 uwe Exp $ */
/* $NetBSD: lock_stubs.S,v 1.7 2007/03/14 05:38:28 uwe Exp $ */
/*
* Copyright (c) 2007 Valeriy E. Ushakov
@ -51,12 +51,11 @@ NENTRY(_lock_cas)
ALTENTRY(_lock_cas_ras_start)
mov.l @r4, r1
cmp/eq r1, r5 ! T = (*ptr == old)
bf.s 1f
movt r0 ! retval = T
bf 1f
mov.l r6, @r4 ! *ptr = new
ALTENTRY(_lock_cas_ras_end)
1: rts
nop
movt r0 ! retval = T
SET_ENTRY_SIZE(_lock_cas)
@ -71,15 +70,16 @@ NENTRY(mutex_enter)
mov #0, r5
bsr _lock_cas ! _lock_cas(&mtx->mtx_owner, 0, curlwp)
mov.l @r6, r6
tst r0, r0
bf.s 1f ! return if success
tst r0, r0 ! failed?
bt.s 1f ! hard case
lds.l @sp+, pr
mov.l .L_mutex_vector_enter, r0
jmp @r0 ! otherwise - hard case
rts
nop
1: mov.l .L_mutex_vector_enter, r0
jmp @r0
nop
/* NOTREACHED */
1: rts
nop
/*
@ -91,15 +91,16 @@ NENTRY(mutex_exit)
mov #0, r6
bsr _lock_cas ! _lock_cas(&mtx->mtx_owner, curlwp, 0)
mov.l @r5, r5
tst r0, r0
bf.s 1f ! return if success
tst r0, r0 ! failed?
bt.s 1f ! hard case
lds.l @sp+, pr
mov.l .L_mutex_vector_exit, r0
jmp @r0 ! otherwise - hard case
rts
nop
1: mov.l .L_mutex_vector_exit, r0
jmp @r0
nop
/* NOTREACHED */
1: rts
nop
.align 2
.L_curlwp: .long _C_LABEL(curlwp)