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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
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/*
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(C) Copyright 2008
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International Business Machines 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
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <spu_intrinsics.h>
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#include "vec_literal.h"
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/*
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* Supply the inline _straddr for use by strncpy and strncat.
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*
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* _straddr: search the string s, and return the address of the first byte
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* containing zero.
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*/
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static inline char *_straddr(const char *s)
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{
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unsigned int cnt, cmp, skip, mask;
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vec_uchar16 *ptr, data;
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/*
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* Compensate for unaligned strings.
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*/
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ptr = (vec_uchar16 *)s; /* implicit (s & ~0xf) */
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skip = (unsigned int)(ptr) & 0xf;
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/*
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* skip the first skip bytes starting at (s & ~0xf).
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*/
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mask = 0xFFFF >> skip;
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data = *ptr;
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cmp = spu_extract(spu_gather(spu_cmpeq(data, 0)), 0);
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cmp &= mask;
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cnt = spu_extract(spu_cntlz(spu_promote(cmp, 0)), 0);
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while (cnt == 32) {
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data = *++ptr;
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cnt = spu_extract(spu_cntlz(spu_gather(spu_cmpeq(data, 0))), 0);
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/*
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* The first 16 bits for gather on a byte vector are zero, so if cnt
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* is 32, none of the 16 bytes in data was zero. And, there are (cnt -
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* 16) non-zero bytes in data.
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*/
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}
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/*
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* The first non-zero byte is at ptr aligned down plus the number of
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* non-zero bytes seen.
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*/
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return ((char*) (((int) ptr & ~0xf) + (cnt - 16)));
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}
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