1 | /* |
---|
2 | (C) Copyright 2001,2006, |
---|
3 | International Business Machines Corporation, |
---|
4 | Sony Computer Entertainment, Incorporated, |
---|
5 | Toshiba Corporation, |
---|
6 | |
---|
7 | All rights reserved. |
---|
8 | |
---|
9 | Redistribution and use in source and binary forms, with or without |
---|
10 | modification, are permitted provided that the following conditions are met: |
---|
11 | |
---|
12 | * Redistributions of source code must retain the above copyright notice, |
---|
13 | this list of conditions and the following disclaimer. |
---|
14 | * Redistributions in binary form must reproduce the above copyright |
---|
15 | notice, this list of conditions and the following disclaimer in the |
---|
16 | documentation and/or other materials provided with the distribution. |
---|
17 | * Neither the names of the copyright holders nor the names of their |
---|
18 | contributors may be used to endorse or promote products derived from this |
---|
19 | software without specific prior written permission. |
---|
20 | |
---|
21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
---|
22 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
23 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
24 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
---|
25 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
---|
26 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
---|
27 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
---|
28 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
---|
29 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
---|
30 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
---|
31 | POSSIBILITY OF SUCH DAMAGE. |
---|
32 | */ |
---|
33 | #include <spu_intrinsics.h> |
---|
34 | #include <stddef.h> |
---|
35 | #include "vec_literal.h" |
---|
36 | |
---|
37 | /* Computes the length of the maximum initial segement |
---|
38 | * of the string pointed to by s1 which consists entirely |
---|
39 | * of characters not contained in the string pointed to by s2. |
---|
40 | */ |
---|
41 | size_t strcspn(const char *s1, const char *s2) |
---|
42 | { |
---|
43 | size_t len, cnt; |
---|
44 | unsigned int offset; |
---|
45 | vec_uchar16 shuffle, match, initial_splat, splat; |
---|
46 | vec_uchar16 data1, data2, dataA, dataB, *ptr1, *ptr2; |
---|
47 | |
---|
48 | ptr1 = (vec_uchar16 *)s1; |
---|
49 | |
---|
50 | offset = (unsigned int)(s1) & 15; |
---|
51 | shuffle = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char) offset), |
---|
52 | VEC_LITERAL(vec_uint4, 0x0010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F)); |
---|
53 | |
---|
54 | len = 0; |
---|
55 | |
---|
56 | dataA = *ptr1++; |
---|
57 | dataB = *ptr1++; |
---|
58 | |
---|
59 | initial_splat = spu_splats((unsigned char)((unsigned int)(s2) & 0xF)); |
---|
60 | |
---|
61 | /* For each quadword of the string s1. |
---|
62 | */ |
---|
63 | do { |
---|
64 | data1 = spu_shuffle(dataA, dataB, shuffle); |
---|
65 | |
---|
66 | |
---|
67 | ptr2 = (vec_uchar16 *)s2; |
---|
68 | data2 = *ptr2; |
---|
69 | data2 = spu_shuffle(data2, data2, initial_splat); |
---|
70 | ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1); |
---|
71 | splat = initial_splat; |
---|
72 | |
---|
73 | match = spu_cmpeq(data1, 0); |
---|
74 | |
---|
75 | /* For each character of s2, compare agains a quadword of s1, |
---|
76 | * accumulating match success in the variable match. |
---|
77 | */ |
---|
78 | while (spu_extract((vec_uint4)data2, 0)) { |
---|
79 | match = spu_or(match, spu_cmpeq(data1, data2)); |
---|
80 | |
---|
81 | splat = spu_and((vec_uchar16)(spu_add((vec_uint4)splat, VEC_SPLAT_U32(0x01010101))), 0xF); |
---|
82 | |
---|
83 | data2 = *ptr2; |
---|
84 | data2 = spu_shuffle(data2, data2, splat); |
---|
85 | ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1); |
---|
86 | } |
---|
87 | |
---|
88 | cnt = spu_extract(spu_cntlz(spu_gather(match)), 0); |
---|
89 | len = (len - 16) + cnt; |
---|
90 | |
---|
91 | dataA = dataB; |
---|
92 | dataB = *ptr1++; |
---|
93 | } while (cnt == 32); |
---|
94 | |
---|
95 | return (len); |
---|
96 | } |
---|