diff options
author | Jeff Johnston <jjohnstn@redhat.com> | 2008-02-13 00:21:13 +0300 |
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committer | Jeff Johnston <jjohnstn@redhat.com> | 2008-02-13 00:21:13 +0300 |
commit | 9cb5dea0e22c3fdde4f0c638b052a0186587cf8f (patch) | |
tree | 79b7e1ab0c2c77673a49797b7c4286d111037cbd /newlib/libc/machine/spu | |
parent | de20111eba5768f4ebb7dcf1d59b1528302a0043 (diff) |
2008-02-11 Patrick Mansfield <patmans@us.ibm.com>
* libc/machine/spu/straddr.h: New file, supplies _straddr.
* libc/machine/spu/strcat.c: Use _straddr and _strcpy.
* libc/machine/spu/strcpy.c: Use _strcpy.
* libc/machine/spu/strcpy.h: Supply _strcpy for optimized SPU
str[n]cpy and str[n]cat.
* libc/machine/spu/strncat.c: Use _straddr and _strcpy.
* libc/machine/spu/strncpy.c: Use _strcpy.
Diffstat (limited to 'newlib/libc/machine/spu')
-rw-r--r-- | newlib/libc/machine/spu/strcpy.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/newlib/libc/machine/spu/strcpy.h b/newlib/libc/machine/spu/strcpy.h new file mode 100644 index 000000000..e2ec2b259 --- /dev/null +++ b/newlib/libc/machine/spu/strcpy.h @@ -0,0 +1,180 @@ +/* + (C) Copyright 2008 + International Business Machines 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 "vec_literal.h" + +/* + * Supply an inline _strncpy for strcpy/cat and strncpy/cat. Relies on + * checklen and lastzero code being optimized out when they are constant + * zero values. + */ +static inline void * _strncpy(char * __restrict__ dest, const char * + __restrict__ src, size_t maxlen, int + checklen, int lastzero) +{ + int adjust, offset, soffset, doffset, shift; + vec_uchar16 *vsrc, *vdest; + vec_uchar16 sdata1, sdata2, sdata, shuffle; + vec_uchar16 mask1, maskzero, cmp0; + vec_uint4 nonzeroes, gathered_cmp, vtmp, vtmp2; + vec_uint4 curlen; /* assumes size_t is 4 bytes */ + const vec_uint4 val31 = { 31, 31, 31, 31 }; + const vec_uint4 val_0123 = { 0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F }; + const vec_uchar16 all_ones = { 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, + 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff }; + + vsrc = (vec_uchar16 *) src; + vdest = (vec_uchar16 *) dest; + soffset = (int) src & 15; + doffset = (int) dest & 15; + + if (checklen) { + /* + * Set curlen so it is the number of bytes we would copy if starting + * from vdest & ~0xf. + * + * curlen could probably be replaced by comparing vdest plus some + * offset to dest + maxlen, that would help mainly in the while loop + * but would lose only one instruction (the curlen -= 16). + */ + curlen = spu_splats((unsigned int) (maxlen + doffset)); + } + + /* + * Setup a shuffle pattern to align the source string with the + * alignment of the destination string. + */ + vtmp = spu_cmpgt(spu_promote(doffset, 0), spu_promote(soffset, 0)); + adjust = spu_extract(vtmp, 0); + offset = soffset - doffset; + offset += adjust & 16; + shuffle = spu_splats((unsigned char) offset); + shuffle = (vec_uchar16) spu_add((vec_uint4) shuffle, val_0123); + + vsrc += adjust; + sdata1 = *vsrc++; + sdata2 = *vsrc++; + sdata = spu_shuffle(sdata1, sdata2, shuffle); + + /* + * mask out leading bytes + */ + mask1 = spu_rlmaskqwbyte(all_ones, -doffset); + + cmp0 = spu_and(mask1, spu_cmpeq(sdata, 0)); + nonzeroes = spu_cntlz(spu_gather(cmp0)); + /* + * First element of nonzeroes - 15 is the number of leading non-zero + * bytes plus 1 for the zero byte. + */ + if (checklen) { + vtmp = spu_add(curlen, 15); + vtmp2 = spu_cmpgt(nonzeroes, vtmp); + nonzeroes = spu_sel(nonzeroes, vtmp, vtmp2); + } + + vtmp = spu_cmpgt(nonzeroes, val31); + /* + * Note: using immediate (constant 31) vs a vector value (val31) does + * not give different results, and we have to have a vector val31 for + * the spu_sel below, so use val31 everywhere. + */ + vtmp = spu_sel(nonzeroes, val31, vtmp); + /* + * So vtmp is now min(nonzeroes, 31), the number of bytes + 16 that we + * want to copy from the first 16 bytes of the source. + */ + if (checklen) { + curlen = spu_sub(vtmp, curlen); + curlen = spu_sub(15, curlen); + } + + /* + * We want a right shift 0xff with fill by ones of (vtmp - 15) bytes, but + * that doesn't exist so use spu_slqwbyte and vtmp all ones left by + * (31 - vtmp). Note: this can also use spu_rlqwbytebc with spu_rlqw. + */ + shift = spu_extract(spu_sub(val31, vtmp), 0); + maskzero = spu_slqwbyte(all_ones, shift); + maskzero = spu_and(mask1, maskzero); + *vdest = spu_sel(*vdest, sdata, maskzero); + + vtmp = spu_cmpgt(nonzeroes, val31); + if (checklen) { + vtmp2 = spu_cmpgt(curlen, 0); + vtmp = spu_and(vtmp, vtmp2); + } + if (spu_extract(vtmp, 0)) { + sdata1 = sdata2; + sdata2 = *vsrc++; + sdata = spu_shuffle(sdata1, sdata2, shuffle); + cmp0 = spu_cmpeq(sdata, 0); + gathered_cmp = spu_gather(cmp0); + /* + * Copy 16 bytes at a time. + */ + while ((spu_extract(gathered_cmp, 0) == 0) && + (!checklen || (spu_extract(curlen, 0) > 15))) { + if (checklen) + curlen = spu_add(curlen, -16); + *++vdest = sdata; + sdata1 = sdata2; + sdata2 = *vsrc++; + sdata = spu_shuffle(sdata1, sdata2, shuffle); + cmp0 = spu_cmpeq(sdata, 0); + gathered_cmp = spu_gather(cmp0); + } + /* + * Copy 0 to 15 trailing bytes, either up to the smaller of curlen or + * the number of non-zero bytes. + */ + nonzeroes = spu_cntlz(gathered_cmp); + if (checklen) { + vtmp = spu_add(curlen, 15); + vtmp2 = spu_cmpgt(nonzeroes, vtmp); + nonzeroes = spu_sel(nonzeroes, vtmp, vtmp2); + curlen = spu_sub(nonzeroes, curlen); + curlen = spu_sub(15, curlen); + } + shift = spu_extract(spu_sub(val31, nonzeroes), 0); + maskzero = spu_slqwbyte(all_ones, shift); + ++vdest; + *vdest = spu_sel(*vdest, sdata, maskzero); + } + + if (checklen && lastzero) { + /* + * For strncat. + */ + dest[maxlen - spu_extract(curlen, 0)] = '\0'; + } + return (dest); +} |