| 1 |
39 |
lampret |
/*
|
| 2 |
|
|
* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
|
| 3 |
|
|
*
|
| 4 |
|
|
* To anyone who acknowledges that this file is provided "AS IS"
|
| 5 |
|
|
* without any express or implied warranty:
|
| 6 |
|
|
* permission to use, copy, modify, and distribute this file
|
| 7 |
|
|
* for any purpose is hereby granted without fee, provided that
|
| 8 |
|
|
* the above copyright notice and this notice appears in all
|
| 9 |
|
|
* copies, and that the name of Hewlett-Packard Company not be
|
| 10 |
|
|
* used in advertising or publicity pertaining to distribution
|
| 11 |
|
|
* of the software without specific, written prior permission.
|
| 12 |
|
|
* Hewlett-Packard Company makes no representations about the
|
| 13 |
|
|
* suitability of this software for any purpose.
|
| 14 |
|
|
*/
|
| 15 |
|
|
|
| 16 |
|
|
/* memcmp(s1, s2, n) */
|
| 17 |
|
|
/* returns integer: < 0 iff s1 lexicographically less than s2 */
|
| 18 |
|
|
/* > 0 iff s1 lexicographically greater than s2 */
|
| 19 |
|
|
/* = 0 iff s1 lexicographically equal to s2 */
|
| 20 |
|
|
/* = 0 iff s1 lexicographically equal to s2 */
|
| 21 |
|
|
/* quit after n charachters */
|
| 22 |
|
|
#ifndef _NAMESPACE_CLEAN
|
| 23 |
|
|
#define NOSECDEF /* prevents _memcmp from becoming primary entry */
|
| 24 |
|
|
#endif
|
| 25 |
|
|
|
| 26 |
|
|
#include "DEFS.h"
|
| 27 |
|
|
|
| 28 |
|
|
#define s1 26
|
| 29 |
|
|
#define s2 25
|
| 30 |
|
|
#define tmp1 19
|
| 31 |
|
|
#define s2word 20
|
| 32 |
|
|
#define tmp3 21
|
| 33 |
|
|
#define tmp7 22
|
| 34 |
|
|
#define s1word 29
|
| 35 |
|
|
#define save 1
|
| 36 |
|
|
#define tmp6 23
|
| 37 |
|
|
#define tmp5 28
|
| 38 |
|
|
#define count 24
|
| 39 |
|
|
|
| 40 |
|
|
ENTRY(memcmp)
|
| 41 |
|
|
combt,<,n r0,count,search /*N <= 0 yields equality */
|
| 42 |
|
|
b done /**/
|
| 43 |
|
|
copy 0,ret0 /*return 0 (DELAY SLOT) */
|
| 44 |
|
|
search: combf,=,n s1,s2,findout /*s1 != s2? */
|
| 45 |
|
|
b done
|
| 46 |
|
|
copy 0,ret0 /*return 0 (delay slot) */
|
| 47 |
|
|
findout:
|
| 48 |
|
|
comibf,=,n 0,s1,checks1 /*s1 == NULL? */
|
| 49 |
|
|
ldbs 0(0,s2),ret0 /**/
|
| 50 |
|
|
b done /*quit */
|
| 51 |
|
|
sub 0,ret0,ret0 /*ret0 <- -*s2 */
|
| 52 |
|
|
checks1:
|
| 53 |
|
|
comibf,=,n 0,s2,checkitout /*s2 == NULL? */
|
| 54 |
|
|
b done /* quit */
|
| 55 |
|
|
ldbs 0(0,s1),28 /* return *s1 */
|
| 56 |
|
|
|
| 57 |
|
|
checkitout:
|
| 58 |
|
|
extru s2,31,2,tmp1 /* Extract the low two bits of the s2. */
|
| 59 |
|
|
extru s1,31,2,tmp5 /* Extract the low two bits of the s1 */
|
| 60 |
|
|
sub,= tmp5,tmp1,tmp3 /* Are s1 & s2 aligned with each other? */
|
| 61 |
|
|
b not_aligned /* It's more complicated (not_aligned) */
|
| 62 |
|
|
dep 0,31,2,s1 /* Compute word address of s1 (DELAY SLOT) */
|
| 63 |
|
|
dep 0,31,2,s2 /* Compute word address of s2 */
|
| 64 |
|
|
ldwm 4(0,s1),s1word /* get next s1 word s1+=4 */
|
| 65 |
|
|
combt,= tmp5,r0,skipmask /* skip masking, if we can */
|
| 66 |
|
|
ldwm 4(0,s2),s2word /* get next s2 word s2+=4 (DELAY SLOT) */
|
| 67 |
|
|
add tmp5,count,count /* bump count by the number of bytes */
|
| 68 |
|
|
/* we are going to mask */
|
| 69 |
|
|
sh3add tmp5,r0,save /* save now has number of bits to mask */
|
| 70 |
|
|
mtctl save,11
|
| 71 |
|
|
zvdepi -2,32,save /* load save with proper mask */
|
| 72 |
|
|
or save,s1word,s1word /* mask s1word (s1) */
|
| 73 |
|
|
or save,s2word,s2word /* mask s2word (s2) */
|
| 74 |
|
|
|
| 75 |
|
|
|
| 76 |
|
|
skipmask:
|
| 77 |
|
|
combt,=,n s1word,s2word,checkN /* We may be done */
|
| 78 |
|
|
|
| 79 |
|
|
checkbyte:
|
| 80 |
|
|
extru s1word,7,8,tmp3 /* get first byte (character) */
|
| 81 |
|
|
ckbyte2: extru s2word,7,8,tmp7 /* get first byte (character) */
|
| 82 |
|
|
combf,= tmp3,tmp7,done /* quit if first byte is not equal */
|
| 83 |
|
|
sub tmp3,tmp7,ret0 /* return difference (delay slot) */
|
| 84 |
|
|
addibt,<=,n -1,count,done /* have we checked N chars? ret0 == 0 */
|
| 85 |
|
|
extru s1word,15,8,tmp3 /* get second byte (character) */
|
| 86 |
|
|
extru s2word,15,8,tmp7 /* get second byte (character) */
|
| 87 |
|
|
combf,= tmp3,tmp7,done /* quit if second byte is not equal */
|
| 88 |
|
|
sub tmp3,tmp7,ret0 /* return difference (delay slot) */
|
| 89 |
|
|
addibt,<=,n -1,count,done /* have we checked N chars? */
|
| 90 |
|
|
extru s1word,23,8,tmp3 /* get third byte (character) */
|
| 91 |
|
|
extru s2word,23,8,tmp7 /* get third byte (character) */
|
| 92 |
|
|
combf,= tmp3,tmp7,done /* done if third byte is not equal */
|
| 93 |
|
|
sub tmp3,tmp7,ret0 /* return difference (delay slot) */
|
| 94 |
|
|
addibt,<=,n -1,count,done /* have we checked N chars? */
|
| 95 |
|
|
extru s1word,31,8,tmp3 /* get last byte (character) */
|
| 96 |
|
|
extru s2word,31,8,tmp7 /* get last byte (character) */
|
| 97 |
|
|
b done /* if we reach this point we know that */
|
| 98 |
|
|
sub tmp3,tmp7,ret0 /* the last character in the word is */
|
| 99 |
|
|
/* where the difference is, so return */
|
| 100 |
|
|
/* the difference and we're outta here */
|
| 101 |
|
|
|
| 102 |
|
|
|
| 103 |
|
|
checkN:
|
| 104 |
|
|
addibt,<=,n -4,count,zero /* have we checked N chars? */
|
| 105 |
|
|
ldwm 4(0,s2),s2word /* get next s2 word s2+=4 */
|
| 106 |
|
|
b skipmask /* keep checking */
|
| 107 |
|
|
ldwm 4(0,s1),s1word /* get next s1 word s1+=4 */
|
| 108 |
|
|
|
| 109 |
|
|
|
| 110 |
|
|
not_aligned:
|
| 111 |
|
|
dep r0,31,2,s2 /* Compute word address of s2 */
|
| 112 |
|
|
combt,<,n r0,tmp3,shifts1 /* Do we shift s1 or s2 */
|
| 113 |
|
|
sh3add tmp3,r0,tmp3 /* eight bits per byte so mul by 8 */
|
| 114 |
|
|
ldwm 4(0,s1),s1word /* get first word of s1 */
|
| 115 |
|
|
ldwm 4(0,s2),s2word /* get first word or s2 */
|
| 116 |
|
|
combt,=,n r0,tmp5,masks2 /* Do we need to mask beginning of s1 */
|
| 117 |
|
|
add tmp5,count,count /* bump count by the number of bytes */
|
| 118 |
|
|
/* we are going to mask */
|
| 119 |
|
|
sh3add tmp5,r0,save /* save now has number of bits to mask */
|
| 120 |
|
|
mtctl save,11
|
| 121 |
|
|
zvdepi -2,32,save /* load save with proper mask */
|
| 122 |
|
|
or save,s1word,s1word /**/
|
| 123 |
|
|
masks2: sh3add tmp1,r0,save /* save now has number of bits to mask */
|
| 124 |
|
|
mtctl save,11
|
| 125 |
|
|
zvdepi -2,32,save /* load save with proper mask */
|
| 126 |
|
|
or save,s2word,s2word /**/
|
| 127 |
|
|
subi 4,tmp1,tmp1 /* tmp1 now has the number of byte that */
|
| 128 |
|
|
/* are valid in s2word before the vshd */
|
| 129 |
|
|
mtctl tmp3,11 /* Move shift amount to CR11 */
|
| 130 |
|
|
more: combt,<=,n count,tmp1,chunk1 /* Can we do the vshd? */
|
| 131 |
|
|
ldwm 4(0,s2),tmp7 /* load second word to enable us to shift */
|
| 132 |
|
|
vshd s2word,tmp7,s2word /**/
|
| 133 |
|
|
combf,=,n s1word,s2word,ckbyte2 /**/
|
| 134 |
|
|
extru s1word,7,8,tmp3 /* get first byte (DELAY SLOT) */
|
| 135 |
|
|
addibt,<=,n -4,count,zero /* have we checked N chars? */
|
| 136 |
|
|
copy tmp7,s2word /**/
|
| 137 |
|
|
b more /* keep checking */
|
| 138 |
|
|
ldwm 4(0,s1),s1word /* get next s1 (DELAY SLOT) */
|
| 139 |
|
|
|
| 140 |
|
|
chunk1:
|
| 141 |
|
|
vshd s2word,r0,s2word /* do an arithmetic shift left to position data */
|
| 142 |
|
|
b ckbyte2 /**/
|
| 143 |
|
|
extru s1word,7,8,tmp3 /**/
|
| 144 |
|
|
|
| 145 |
|
|
|
| 146 |
|
|
shifts1:
|
| 147 |
|
|
sh3add tmp3,r0,tmp3 /* eight bits per byte so mul by 8 */
|
| 148 |
|
|
sub r0,tmp3,tmp3 /* Get negative value for left shift */
|
| 149 |
|
|
dep r0,31,2,s2 /* Compute word address of s2 */
|
| 150 |
|
|
ldwm 4(0,s2),s2word /* get first word of s2 */
|
| 151 |
|
|
ldwm 4(0,s1),s1word /* get first word or s1 */
|
| 152 |
|
|
combt,=,n r0,tmp1,masks1 /*Do we need to mask beginning of s2 */
|
| 153 |
|
|
add tmp1,count,count /*bump count by the number of bytes */
|
| 154 |
|
|
/* we are going to mask */
|
| 155 |
|
|
sh3add tmp1,r0,save /*save now has number of bits to mask */
|
| 156 |
|
|
mtctl save,11
|
| 157 |
|
|
zvdepi -2,32,save /*load save with proper mask */
|
| 158 |
|
|
or save,s2word,s2word /**/
|
| 159 |
|
|
masks1: sh3add tmp5,r0,save /*save now has number of bits to mask */
|
| 160 |
|
|
mtctl save,11
|
| 161 |
|
|
zvdepi -2,32,save /*load save with proper mask */
|
| 162 |
|
|
or save,s1word,s1word /**/
|
| 163 |
|
|
subi 4,tmp5,tmp5 /*tmp5 now has the number of byte that */
|
| 164 |
|
|
/*are valid in s1word before the vshd */
|
| 165 |
|
|
mtctl tmp3,11 /*Move shift amount to CR11 */
|
| 166 |
|
|
more1: combt,<=,n count,tmp5,chunk2 /*Can we do the vshd? */
|
| 167 |
|
|
ldwm 4(0,s1),tmp7 /*load second word to enable us to shift */
|
| 168 |
|
|
vshd s1word,tmp7,s1word /**/
|
| 169 |
|
|
combf,=,n s2word,s1word,ckbyte2 /**/
|
| 170 |
|
|
extru s1word,7,8,tmp3 /*get first byte (DELAY SLOT) */
|
| 171 |
|
|
addibt,<=,n -4,count,zero /*have we checked N chars? */
|
| 172 |
|
|
copy tmp7,s1word /**/
|
| 173 |
|
|
b more1 /*keep checking */
|
| 174 |
|
|
ldwm 4(0,s2),s2word /*get next s2 (DELAY SLOT) */
|
| 175 |
|
|
|
| 176 |
|
|
chunk2:
|
| 177 |
|
|
vshd s1word,r0,s1word /**/
|
| 178 |
|
|
b ckbyte2 /**/
|
| 179 |
|
|
extru s1word,7,8,tmp3 /**/
|
| 180 |
|
|
|
| 181 |
|
|
zero: copy r0,ret0
|
| 182 |
|
|
done:
|
| 183 |
|
|
EXIT(memcmp)
|
