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/*
 * memcmp routine for Z8000
 * Copyright (C) 2004 Christian Groessler 
 *
 * Permission to use, copy, modify, and distribute this file
 * for any purpose is hereby granted without fee, provided that
 * the above copyright notice and this notice appears in all
 * copies.
 *
 * This file is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
/* int memcmp(const void *b1, const void *b2, size_t length);
 */
 
        name    "memcmp.S"
 
        .text
        even
global  _memcmp
 
_memcmp:
 
#ifdef __Z8001__
        segm
 
#ifdef __STD_CALL__
        ldl     rr6,rr14(#4)
        ldl     rr4,rr14(#8)
        ldl     rr2,rr14(#12)
#endif
 
/* rr2  - length        (high word ignored)
 * rr4  - b2
 * rr6  - b1
 */
 
        clr     r1              /* initialize return value */
        testl   rr2
        jr      z,finish
 
        bitb    rl7,#0          /* odd b1? */
        jr      nz,testb2
        bitb    rl5,#0          /* odd b2? */
        jr      nz,odd_cmp      /* b1 even, b2 odd */
        jr      t,even_cmp
 
testb2:
        bitb    rl5,#0
        jr      z,odd_cmp       /* b2 even, b1 odd */
 
        cpsib   @rr6,@rr4,r3,eq
        jr      z,beq           /* bytes are the same */
        jr      t,byte_diff
 
beq:    jr      ov,finish       /* jump if r3 is zero now */
 
/* compare words */
even_cmp:
        ld      r2,r3           /* remember length */
        srl     r3,#1
        jr      z,no_words
 
        cpsir   @rr6,@rr4,r3,ne
        jr      nz,no_words
 
        dec     r7,#2
        dec     r5,#2           /* point to different bytes */
        ldk     r3,#2
        jr      t,odd_cmp
 
no_words:
        bitb    rl2,#0          /* odd length? */
        jr      z,finish
 
        cpsib   @rr6,@rr4,r3,eq
        jr      z,finish        /* last bytes are the same */
        jr      t,byte_diff
 
/* compare bytes */
odd_cmp:
        cpsirb  @rr6,@rr4,r3,ne
        jr      nz,finish
 
byte_diff:
        dec     r7,#1
        dec     r5,#1           /* point to different bytes */
 
        ldb     rl1,@rr6
        clr     r0
        ldb     rl0,@rr4
        sub     r1,r0
 
finish:                         /* set return value */
#ifdef __STD_CALL__
        ld      r7,r1
#else
        ld      r2,r1
#endif
 
 
#else           /* above Z8001, below Z8002 */
 
 
        unsegm
 
#ifdef __STD_CALL__
        ld      r7,r15(#2)
        ld      r6,r15(#4)
        ld      r5,r15(#6)
#endif
 
/* r5  - length
 * r6  - b2
 * r7  - b1
 */
 
        clr     r1              /* initialize return value */
        test    r5
        jr      z,finish
 
        bitb    rl7,#0          /* odd destination address? */
        jr      nz,testb2
        bitb    rl6,#0          /* odd source address? */
        jr      nz,odd_cmp      /* b1 even, b2 odd */
        jr      t,even_cmp
 
testb2:
        bitb    rl6,#0
        jr      z,odd_cmp       /* b2 even, b1 odd */
 
        cpsib   @r7,@r6,r5,eq
        jr      z,beq           /* bytes are the same */
        jr      t,byte_diff
 
beq:    jr      ov,finish       /* jump if r3 is zero now */
 
/* compare words */
even_cmp:
        ld      r4,r5           /* remember length */
        srl     r5,#1
        jr      z,no_words
 
        cpsir   @r7,@r6,r5,ne
        jr      nz,no_words
 
        dec     r7,#2
        dec     r6,#2           /* point to different bytes */
        ldk     r5,#2
        jr      t,odd_cmp
 
no_words:
        bitb    rl4,#0          /* odd length? */
        jr      z,finish
 
        cpsib   @r7,@r6,r4,eq
        jr      z,finish        /* last bytes are the same */
        jr      t,byte_diff
 
/* compare bytes */
odd_cmp:
        cpsirb  @r7,@r6,r5,ne
        jr      nz,finish
 
byte_diff:
        dec     r7,#1
        dec     r6,#1           /* point to different bytes */
 
        ldb     rl1,@r7
        clr     r0
        ldb     rl0,@r6
        sub     r1,r0
 
finish:
#ifdef __STD_CALL__
        ld      r7,r1
#else
        ld      r2,r1
#endif
 
#endif  /* Z8002 */
 
        ret
        .end

Line No.	Rev	Author	Line
1	207	jeremybenn	`/*`
2			`* memcmp routine for Z8000`
3			`* Copyright (C) 2004 Christian Groessler`
4			`*`
5			`* Permission to use, copy, modify, and distribute this file`
6			`* for any purpose is hereby granted without fee, provided that`
7			`* the above copyright notice and this notice appears in all`
8			`* copies.`
9			`*`
10			`* This file is distributed WITHOUT ANY WARRANTY; without even the implied`
11			`* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.`
12			`*/`
13
14			`/* int memcmp(const void b1, const void b2, size_t length);`
15			`*/`
16
17			`name "memcmp.S"`
18
19			`.text`
20			`even`
21			`global _memcmp`
22
23			`_memcmp:`
24
25			`#ifdef __Z8001__`
26			`segm`
27
28			`#ifdef __STD_CALL__`
29			`ldl rr6,rr14(#4)`
30			`ldl rr4,rr14(#8)`
31			`ldl rr2,rr14(#12)`
32			`#endif`
33
34			`/* rr2 - length (high word ignored)`
35			`* rr4 - b2`
36			`* rr6 - b1`
37			`*/`
38
39			`clr r1 /* initialize return value */`
40			`testl rr2`
41			`jr z,finish`
42
43			`bitb rl7,#0 /* odd b1? */`
44			`jr nz,testb2`
45			`bitb rl5,#0 /* odd b2? */`
46			`jr nz,odd_cmp /* b1 even, b2 odd */`
47			`jr t,even_cmp`
48
49			`testb2:`
50			`bitb rl5,#0`
51			`jr z,odd_cmp /* b2 even, b1 odd */`
52
53			`cpsib @rr6,@rr4,r3,eq`
54			`jr z,beq /* bytes are the same */`
55			`jr t,byte_diff`
56
57			`beq: jr ov,finish /* jump if r3 is zero now */`
58
59			`/* compare words */`
60			`even_cmp:`
61			`ld r2,r3 /* remember length */`
62			`srl r3,#1`
63			`jr z,no_words`
64
65			`cpsir @rr6,@rr4,r3,ne`
66			`jr nz,no_words`
67
68			`dec r7,#2`
69			`dec r5,#2 /* point to different bytes */`
70			`ldk r3,#2`
71			`jr t,odd_cmp`
72
73			`no_words:`
74			`bitb rl2,#0 /* odd length? */`
75			`jr z,finish`
76
77			`cpsib @rr6,@rr4,r3,eq`
78			`jr z,finish /* last bytes are the same */`
79			`jr t,byte_diff`
80
81			`/* compare bytes */`
82			`odd_cmp:`
83			`cpsirb @rr6,@rr4,r3,ne`
84			`jr nz,finish`
85
86			`byte_diff:`
87			`dec r7,#1`
88			`dec r5,#1 /* point to different bytes */`
89
90			`ldb rl1,@rr6`
91			`clr r0`
92			`ldb rl0,@rr4`
93			`sub r1,r0`
94
95			`finish: /* set return value */`
96			`#ifdef __STD_CALL__`
97			`ld r7,r1`
98			`#else`
99			`ld r2,r1`
100			`#endif`
101
102
103			`#else /* above Z8001, below Z8002 */`
104
105
106			`unsegm`
107
108			`#ifdef __STD_CALL__`
109			`ld r7,r15(#2)`
110			`ld r6,r15(#4)`
111			`ld r5,r15(#6)`
112			`#endif`
113
114			`/* r5 - length`
115			`* r6 - b2`
116			`* r7 - b1`
117			`*/`
118
119			`clr r1 /* initialize return value */`
120			`test r5`
121			`jr z,finish`
122
123			`bitb rl7,#0 /* odd destination address? */`
124			`jr nz,testb2`
125			`bitb rl6,#0 /* odd source address? */`
126			`jr nz,odd_cmp /* b1 even, b2 odd */`
127			`jr t,even_cmp`
128
129			`testb2:`
130			`bitb rl6,#0`
131			`jr z,odd_cmp /* b2 even, b1 odd */`
132
133			`cpsib @r7,@r6,r5,eq`
134			`jr z,beq /* bytes are the same */`
135			`jr t,byte_diff`
136
137			`beq: jr ov,finish /* jump if r3 is zero now */`
138
139			`/* compare words */`
140			`even_cmp:`
141			`ld r4,r5 /* remember length */`
142			`srl r5,#1`
143			`jr z,no_words`
144
145			`cpsir @r7,@r6,r5,ne`
146			`jr nz,no_words`
147
148			`dec r7,#2`
149			`dec r6,#2 /* point to different bytes */`
150			`ldk r5,#2`
151			`jr t,odd_cmp`
152
153			`no_words:`
154			`bitb rl4,#0 /* odd length? */`
155			`jr z,finish`
156
157			`cpsib @r7,@r6,r4,eq`
158			`jr z,finish /* last bytes are the same */`
159			`jr t,byte_diff`
160
161			`/* compare bytes */`
162			`odd_cmp:`
163			`cpsirb @r7,@r6,r5,ne`
164			`jr nz,finish`
165
166			`byte_diff:`
167			`dec r7,#1`
168			`dec r6,#1 /* point to different bytes */`
169
170			`ldb rl1,@r7`
171			`clr r0`
172			`ldb rl0,@r6`
173			`sub r1,r0`
174
175			`finish:`
176			`#ifdef __STD_CALL__`
177			`ld r7,r1`
178			`#else`
179			`ld r2,r1`
180			`#endif`
181
182			`#endif /* Z8002 */`
183
184			`ret`
185			`.end`

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [z8k/] [memcmp.S] - Blame information for rev 301