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Rearrange the beginning of cpu_switch() slightly to reduce data-dep 

stalls on StrongARM and XScale.
This commit is contained in:
thorpej 2002-08-12 21:00:12 +00:00
parent 641df8d3f6
commit d7be866fc8
1 changed files with 7 additions and 8 deletions
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15
sys/arch/arm/arm32/cpuswitch.S
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@ -1,4 +1,4 @@
/* $NetBSD: cpuswitch.S,v 1.10 2002/08/12 19:33:01 thorpej Exp $ */
/* $NetBSD: cpuswitch.S,v 1.11 2002/08/12 21:00:12 thorpej Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -281,16 +281,15 @@ ENTRY(cpu_switch)
/*
* Get the current process and indicate that there is no longer
* a valid process (curproc = 0)
* a valid process (curproc = 0). Zero the current PCB pointer
* while we're at it.
*/
ldr r7, Lcurproc
ldr r1, [r7]
ldr r6, Lcurpcb
mov r0, #0x00000000
str r0, [r7]
/* Zero the pcb */
ldr r7, Lcurpcb
str r0, [r7]
ldr r1, [r7] /* r1 = curproc */
str r0, [r7] /* curproc = NULL */
str r0, [r6] /* curpcb = NULL */
/* stash the old proc while we call functions */
mov r5, r1