97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/*
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(C) Copyright 2001,2006,
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International Business Machines Corporation,
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Sony Computer Entertainment, Incorporated,
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Toshiba Corporation,
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <spu_intrinsics.h>
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#include <stddef.h>
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#include "vec_literal.h"
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/* Computes the length of the maximum initial segement
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* of the string pointed to by s1 which consists entirely
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* of characters not contained in the string pointed to by s2.
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*/
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size_t strcspn(const char *s1, const char *s2)
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{
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size_t len, cnt;
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unsigned int offset;
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vec_uchar16 shuffle, match, initial_splat, splat;
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vec_uchar16 data1, data2, dataA, dataB, *ptr1, *ptr2;
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ptr1 = (vec_uchar16 *)s1;
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offset = (unsigned int)(s1) & 15;
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shuffle = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char) offset),
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VEC_LITERAL(vec_uint4, 0x0010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F));
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len = 0;
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dataA = *ptr1++;
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dataB = *ptr1++;
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initial_splat = spu_splats((unsigned char)((unsigned int)(s2) & 0xF));
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/* For each quadword of the string s1.
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*/
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do {
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data1 = spu_shuffle(dataA, dataB, shuffle);
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ptr2 = (vec_uchar16 *)s2;
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data2 = *ptr2;
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data2 = spu_shuffle(data2, data2, initial_splat);
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ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1);
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splat = initial_splat;
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match = spu_cmpeq(data1, 0);
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/* For each character of s2, compare agains a quadword of s1,
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* accumulating match success in the variable match.
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*/
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while (spu_extract((vec_uint4)data2, 0)) {
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match = spu_or(match, spu_cmpeq(data1, data2));
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splat = spu_and((vec_uchar16)(spu_add((vec_uint4)splat, VEC_SPLAT_U32(0x01010101))), 0xF);
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data2 = *ptr2;
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data2 = spu_shuffle(data2, data2, splat);
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ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1);
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}
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cnt = spu_extract(spu_cntlz(spu_gather(match)), 0);
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len = (len - 16) + cnt;
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dataA = dataB;
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dataB = *ptr1++;
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} while (cnt == 32);
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return (len);
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}
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