[src/trunk]: src/sys/arch/aarch64/aarch64 optimize. reduce 2 instructions.

[ryo <ryo%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/30b075190106
branches:  trunk
changeset: 366638:30b075190106
user:      ryo <ryo%NetBSD.org@localhost>
date:      Fri Jun 03 19:59:59 2022 +0000

description:
optimize. reduce 2 instructions.

diffstat:

 sys/arch/aarch64/aarch64/cpuswitch.S |  10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diffs (40 lines):

diff -r d2bd600e9eae -r 30b075190106 sys/arch/aarch64/aarch64/cpuswitch.S
--- a/sys/arch/aarch64/aarch64/cpuswitch.S      Fri Jun 03 17:04:54 2022 +0000
+++ b/sys/arch/aarch64/aarch64/cpuswitch.S      Fri Jun 03 19:59:59 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpuswitch.S,v 1.35 2022/05/31 07:40:25 ryo Exp $ */
+/* $NetBSD: cpuswitch.S,v 1.36 2022/06/03 19:59:59 ryo Exp $ */
 
 /*-
  * Copyright (c) 2014, 2020 The NetBSD Foundation, Inc.
@@ -38,7 +38,7 @@
 #include "opt_ddb.h"
 #include "opt_kasan.h"
 
-RCSID("$NetBSD: cpuswitch.S,v 1.35 2022/05/31 07:40:25 ryo Exp $")
+RCSID("$NetBSD: cpuswitch.S,v 1.36 2022/06/03 19:59:59 ryo Exp $")
 
        ARMV8_DEFINE_OPTIONS
 
@@ -156,9 +156,8 @@
        stp     x19, x20, [sp, #-16]!   /* save */
        sub     sp, sp, #TF_SIZE        /* make switchframe */
        adr     x2, softint_cleanup     /* return address for cpu_switchto() */
-       mov     x20, lr                 /* x20 := original lr */
        mrs     x19, daif               /* x19 := original interrupt mask */
-       stp     x19, x20, [sp, #TF_X19]
+       stp     x19, lr, [sp, #TF_X19]  /* x20 := original lr */
        stp     x21, x22, [sp, #TF_X21]
        stp     x23, x24, [sp, #TF_X23]
        stp     x25, x26, [sp, #TF_X25]
@@ -241,9 +240,8 @@
 1:
 #endif
 
-       ldp     x19, x20, [sp, #TF_X19]
+       ldp     x19, lr, [sp, #TF_X19]  /* restore pinned_lwp lr */
        msr     daif, x19               /* restore interrupt mask */
-       mov     lr, x20                 /* restore pinned_lwp lr */
 
        add     sp, sp, #TF_SIZE        /* unwind switchframe */
        ldp     x19, x20, [sp], #16     /* restore */