mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-27 14:50:23 +00:00
96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/*
|
|
(C) Copyright 2001,2006,
|
|
International Business Machines Corporation,
|
|
Sony Computer Entertainment, Incorporated,
|
|
Toshiba Corporation,
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
* Neither the names of the copyright holders nor the names of their
|
|
contributors may be used to endorse or promote products derived from this
|
|
software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#include <spu_intrinsics.h>
|
|
#include <stddef.h>
|
|
#include "vec_literal.h"
|
|
|
|
/* Computes the length of the maximum initial segement
|
|
* of the string pointed to by s1 which consists entirely
|
|
* of characters from the string pointed to by s2.
|
|
*/
|
|
size_t strspn(const char *s1, const char *s2)
|
|
{
|
|
size_t len, cnt;
|
|
unsigned int offset;
|
|
vec_uchar16 shuffle, match, initial_splat, splat;
|
|
vec_uchar16 data1, data2, dataA, dataB, *ptr1, *ptr2;
|
|
|
|
ptr1 = (vec_uchar16 *)s1;
|
|
|
|
offset = (unsigned int)(s1) & 15;
|
|
shuffle = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char) offset),
|
|
VEC_LITERAL(vec_uint4, 0x0010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F));
|
|
|
|
len = 0;
|
|
|
|
dataA = *ptr1++;
|
|
dataB = *ptr1++;
|
|
|
|
initial_splat = spu_splats((unsigned char)((unsigned int)(s2) & 0xF));
|
|
|
|
/* For each quadword of the string s1.
|
|
*/
|
|
do {
|
|
data1 = spu_shuffle(dataA, dataB, shuffle);
|
|
|
|
match = spu_splats((unsigned char)0);
|
|
|
|
ptr2 = (vec_uchar16 *)s2;
|
|
data2 = *ptr2;
|
|
data2 = spu_shuffle(data2, data2, initial_splat);
|
|
ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1);
|
|
splat = initial_splat;
|
|
|
|
/* For each character of s2, compare agains a quadword of s1,
|
|
* accumulating match success in the variable match.
|
|
*/
|
|
while (spu_extract((vec_uint4)data2, 0)) {
|
|
match = spu_or(match, spu_cmpeq(data1, data2));
|
|
|
|
splat = spu_and((vec_uchar16)(spu_add((vec_uint4)splat, VEC_SPLAT_U32(0x01010101))), 0xF);
|
|
|
|
data2 = *ptr2;
|
|
data2 = spu_shuffle(data2, data2, splat);
|
|
ptr2 = (vec_uchar16 *)((unsigned int)(ptr2) + 1);
|
|
}
|
|
|
|
cnt = spu_extract(spu_cntlz(spu_gather(spu_xor(match, -1))), 0);
|
|
len = (len - 16) + cnt;
|
|
|
|
dataA = dataB;
|
|
dataB = *ptr1++;
|
|
} while (cnt == 32);
|
|
|
|
return (len);
|
|
}
|