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use mvz[wb] when possible

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This commit is contained in:
matt 2013-07-22 03:37:17 +00:00
parent 32e8c32db8
commit cc7b19c021
1 changed files with 13 additions and 1 deletions
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14
sys/arch/m68k/m68k/oc_cksum.s
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@ -1,4 +1,4 @@
| $NetBSD: oc_cksum.s,v 1.7 2013/07/22 03:30:38 matt Exp $
| $NetBSD: oc_cksum.s,v 1.8 2013/07/22 03:37:17 matt Exp $
| Copyright (c) 1988 Regents of the University of California.
| All rights reserved.
@ -194,19 +194,31 @@ L5: | deal with 1 or 3 excess bytes at the end of the buffer.
jeq L6 | if 1 excess
| 3 bytes excess
#ifdef __mcoldfire__
mvzw (-3,%a0,%d1:l),%d2 | add in last full word then drop
#else
clrl %d2
movw (-3,%a0,%d1:l),%d2 | add in last full word then drop
#endif
addl %d2,%d0 | through to pick up last byte
L6: | 1 byte excess
#ifdef __mcoldfire__
mvzb (-1,%a0,%d1:l),%d2
#else
clrl %d2
movb (-1,%a0,%d1:l),%d2
#endif
lsll #8,%d2
addl %d2,%d0
jra L1
L7: | 2 bytes excess
#ifdef __mcoldfire__
mvzw (-2,%a0,%d1:l),%d2
#else
clrl %d2
movw (-2,%a0,%d1:l),%d2
#endif
addl %d2,%d0
jra L1