[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 | |
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| 36 | /* Scans the string pointed to by s for the character c and |
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| 37 | * returns a pointer to the first occurance of c. If |
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| 38 | * c is not found, then NULL is returned. |
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| 39 | */ |
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| 40 | char *strchr(const char *s, int c) |
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| 41 | { |
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| 42 | unsigned int cmp, skip; |
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| 43 | vec_uchar16 *ptr, data, vc; |
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| 44 | vec_uint4 cmp_c, cmp_0; |
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| 45 | vec_uint4 result; |
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| 46 | vec_uint4 mask; |
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| 47 | vec_uint4 one = spu_splats(0xffffU); |
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| 48 | /* Scan memory array a quadword at a time. Skip leading |
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| 49 | * mis-aligned bytes. |
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| 50 | */ |
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| 51 | ptr = (vec_uchar16 *)s; |
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| 52 | |
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| 53 | skip = (unsigned int)(ptr) & 15; |
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| 54 | mask = spu_rlmask(one, -skip); |
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| 55 | |
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| 56 | vc = spu_splats((unsigned char)(c)); |
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| 57 | |
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| 58 | data = *ptr++; |
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| 59 | |
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| 60 | cmp_c = spu_and(spu_gather(spu_cmpeq(data, vc)), mask); |
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| 61 | cmp_0 = spu_and(spu_gather(spu_cmpeq(data, 0)), mask); |
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| 62 | |
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| 63 | cmp = spu_extract(spu_or(cmp_c, cmp_0), 0); |
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| 64 | |
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| 65 | while (cmp == 0) { |
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| 66 | data = *ptr++; |
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| 67 | cmp_c = spu_gather(spu_cmpeq(data, vc)); |
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| 68 | cmp_0 = spu_gather(spu_cmpeq(data, 0)); |
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| 69 | |
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| 70 | cmp = spu_extract(spu_or(cmp_c, cmp_0), 0); |
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| 71 | } |
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| 72 | |
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| 73 | /* Compute the location of the first character. If it is beyond |
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| 74 | * the end of the string, then return NULL. |
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| 75 | */ |
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| 76 | result = spu_add(spu_promote((unsigned int)ptr - (skip+32), 0), |
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| 77 | spu_cntlz(spu_promote(cmp, 0))); |
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| 78 | |
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| 79 | result = spu_andc(result, spu_cmpgt(cmp_0, cmp_c)); |
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| 80 | |
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| 81 | return ((char *)spu_extract(result, 0)); |
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| 82 | } |
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