[src/trunk]: src/sys/arch/powerpc/powerpc witch from xor r, r, r to li r, 0 to s...

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

details:   https://anonhg.NetBSD.org/src/rev/d91c610cec0f
branches:  trunk
changeset: 543272:d91c610cec0f
user:      matt <matt%NetBSD.org@localhost>
date:      Fri Feb 21 15:14:08 2003 +0000

description:
witch from xor r,r,r to li r,0 to set a register to 0.  It's clearer (and
better for G4 processors).

diffstat:

 sys/arch/powerpc/powerpc/locore_subr.S |  20 ++++++++++----------
 sys/arch/powerpc/powerpc/trap_subr.S   |   6 +++---
 2 files changed, 13 insertions(+), 13 deletions(-)

diffs (117 lines):

diff -r 6c16ffee5038 -r d91c610cec0f sys/arch/powerpc/powerpc/locore_subr.S
--- a/sys/arch/powerpc/powerpc/locore_subr.S    Fri Feb 21 15:03:44 2003 +0000
+++ b/sys/arch/powerpc/powerpc/locore_subr.S    Fri Feb 21 15:14:08 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore_subr.S,v 1.9 2003/02/03 17:10:11 matt Exp $     */
+/*     $NetBSD: locore_subr.S,v 1.10 2003/02/21 15:14:08 matt Exp $    */
 
 /*
  * Copyright (c) 2001 Wasabi Systems, Inc.
@@ -193,7 +193,7 @@
        addi    1,6,USPACE-16           /* 16 bytes are reserved at stack top */
 
 1:
-       xor     31,31,31
+       li      31,0
        stw     31,CI_CURLWP(7)         /* Zero to not accumulate cpu time */
        lwz     31,CI_CURPCB(7)
 
@@ -201,7 +201,7 @@
        stw     3,PCB_SPL(31)           /* save spl */
 #else
        GET_CPUINFO(3)
-       xor     31,31,31
+       li      31,0
        stw     31,CI_CURLWP(3)         /* Zero to not accumulate cpu time */
        lwz     31,CI_CURPCB(3)
 #endif
@@ -211,7 +211,7 @@
        bl      _C_LABEL(sched_unlock_idle)
 #endif
 
-       xor     3,3,3                   /* spl0() */
+       li      3,0                     /* spl0() */
        bl      _C_LABEL(lcsplx)
 #if !defined(MULTIPROCESSOR)
        stw     3,PCB_SPL(31)           /* save spl */
@@ -261,7 +261,7 @@
 switch_common:
 1:
        /* just did this resched thing */
-       xor     3,3,3
+       li      3,0
        GET_CPUINFO(4)
        stw     3,CI_WANT_RESCHED(4)
        stw     3,L_BACK(31)            /* probably superfluous */
@@ -279,7 +279,7 @@
        lwz     4,L_ADDR(31)
 
 #if !defined(MULTIPROCESSOR)           /* XXX */
-       xor     3,3,3                   /* if it is the same lwp, return 0 */
+       li      3,0                     /* if it is the same lwp, return 0 */
        cmpl    0,31,30                 /* is it the same lwp? */
        beq     switch_return
 
@@ -409,7 +409,7 @@
        addi    1,6,USPACE-16           /* 16 bytes are reserved at stack top */
 
 1:
-       xor     31,31,31
+       li      31,0
        stw     31,CI_CURLWP(7)         /* Zero to not accumulate cpu time */
        lwz     31,CI_CURPCB(7)
 
@@ -417,7 +417,7 @@
        stw     3,PCB_SPL(31)           /* save spl */
 #else
        GET_CPUINFO(3)
-       xor     31,31,31
+       li      31,0
        stw     31,CI_CURLWP(3)         /* Zero to not accumulate cpu time */
        lwz     31,CI_CURPCB(3)
 #endif
@@ -427,7 +427,7 @@
        bl      _C_LABEL(sched_unlock_idle)
 #endif
 
-       xor     3,3,3
+       li      3,0
        bl      _C_LABEL(lcsplx)
 #if !defined(MULTIPROCESSOR)
        stw     3,PCB_SPL(31)           /* save spl */
@@ -465,7 +465,7 @@
 #if defined(MULTIPROCESSOR)
        bl      _C_LABEL(proc_trampoline_mp)
 #endif
-       xor     3,3,3
+       li      3,0
        bl      _C_LABEL(lcsplx)
        mtlr    31
        mr      3,30
diff -r 6c16ffee5038 -r d91c610cec0f sys/arch/powerpc/powerpc/trap_subr.S
--- a/sys/arch/powerpc/powerpc/trap_subr.S      Fri Feb 21 15:03:44 2003 +0000
+++ b/sys/arch/powerpc/powerpc/trap_subr.S      Fri Feb 21 15:14:08 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: trap_subr.S,v 1.34 2003/02/03 17:10:11 matt Exp $      */
+/*     $NetBSD: trap_subr.S,v 1.35 2003/02/21 15:14:08 matt Exp $      */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -553,7 +553,7 @@
        cmpi    0,_s1_,MPC601;                                          \
        bne     99f;                    /* skip if not 601 */           \
        CPU601_KERN_LEAVE_HOOK(_pmap_,_s1_);                            \
-       xor     _s1_,_s1_,_s1_;                                         \
+       li      _s1_,0;                                                 \
        mtibatl 0,_s1_;                 /* obliterate BATs */           \
        mtibatl 1,_s1_;                                                 \
        mtibatl 2,_s1_;                                                 \
@@ -1047,7 +1047,7 @@
        sync
        icbi    0,9                     /* and instruction caches */
        mr      6,3
-       xor     3,3,3
+       li      3,0
        stb     4,0(6)
        dcbst   0,6                     /* Now do appropriate flushes
                                           to data... */