[444] | 1 | /* |
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| 2 | (C) Copyright 2001,2006, |
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| 3 | International Business Machines Corporation, |
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| 4 | Sony Computer Entertainment, Incorporated, |
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| 5 | Toshiba Corporation, |
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| 6 | |
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| 7 | All rights reserved. |
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| 8 | |
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| 9 | Redistribution and use in source and binary forms, with or without |
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| 10 | modification, are permitted provided that the following conditions are met: |
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| 11 | |
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| 12 | * Redistributions of source code must retain the above copyright notice, |
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| 13 | this list of conditions and the following disclaimer. |
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| 14 | * Redistributions in binary form must reproduce the above copyright |
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| 15 | notice, this list of conditions and the following disclaimer in the |
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| 16 | documentation and/or other materials provided with the distribution. |
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| 17 | * Neither the names of the copyright holders nor the names of their |
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| 18 | contributors may be used to endorse or promote products derived from this |
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| 19 | software without specific prior written permission. |
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| 20 | |
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| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 22 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 25 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 26 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 27 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 28 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 29 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 30 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 31 | POSSIBILITY OF SUCH DAMAGE. |
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| 32 | */ |
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| 33 | #include <spu_intrinsics.h> |
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| 34 | #include <stddef.h> |
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| 35 | #include "vec_literal.h" |
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| 36 | |
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| 37 | /* Computes the length of the maximum initial segement |
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| 38 | * of the string pointed to by s1 which consists entirely |
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| 39 | * of characters not contained in the string pointed to by s2. |
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| 40 | */ |
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| 41 | size_t strcspn(const char *s1, const char *s2) |
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| 42 | { |
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| 43 | size_t len, cnt; |
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| 44 | unsigned int offset; |
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| 45 | vec_uchar16 shuffle, match, initial_splat, splat; |
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| 46 | vec_uchar16 data1, data2, dataA, dataB, *ptr1, *ptr2; |
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| 47 | |
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| 48 | ptr1 = (vec_uchar16 *)s1; |
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| 49 | |
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| 50 | offset = (unsigned int)(s1) & 15; |
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| 51 | shuffle = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char) offset), |
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| 52 | VEC_LITERAL(vec_uint4, 0x0010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F)); |
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| 53 | |
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| 54 | len = 0; |
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| 55 | |
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| 56 | dataA = *ptr1++; |
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| 57 | dataB = *ptr1++; |
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| 58 | |
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| 59 | initial_splat = spu_splats((unsigned char)((unsigned int)(s2) & 0xF)); |
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| 60 | |
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| 61 | /* For each quadword of the string s1. |
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| 62 | */ |
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| 63 | do { |
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| 64 | data1 = spu_shuffle(dataA, dataB, shuffle); |
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| 65 | |
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| 66 | |
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| 67 | ptr2 = (vec_uchar16 *)s2; |
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| 68 | data2 = *ptr2; |
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| 69 | data2 = spu_shuffle(data2, data2, initial_splat); |
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| 70 | ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1); |
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| 71 | splat = initial_splat; |
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| 72 | |
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| 73 | match = spu_cmpeq(data1, 0); |
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| 74 | |
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| 75 | /* For each character of s2, compare agains a quadword of s1, |
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| 76 | * accumulating match success in the variable match. |
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| 77 | */ |
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| 78 | while (spu_extract((vec_uint4)data2, 0)) { |
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| 79 | match = spu_or(match, spu_cmpeq(data1, data2)); |
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| 80 | |
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| 81 | splat = spu_and((vec_uchar16)(spu_add((vec_uint4)splat, VEC_SPLAT_U32(0x01010101))), 0xF); |
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| 82 | |
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| 83 | data2 = *ptr2; |
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| 84 | data2 = spu_shuffle(data2, data2, splat); |
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| 85 | ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1); |
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| 86 | } |
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| 87 | |
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| 88 | cnt = spu_extract(spu_cntlz(spu_gather(match)), 0); |
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| 89 | len = (len - 16) + cnt; |
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| 90 | |
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| 91 | dataA = dataB; |
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| 92 | dataB = *ptr1++; |
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| 93 | } while (cnt == 32); |
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| 94 | |
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| 95 | return (len); |
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| 96 | } |
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