| 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 | /* Fills the first n bytes of the memory area pointed to by s |
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| 37 | * with the constant byte c. Returns a pointer to the memory area s. |
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| 38 | */ |
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| 39 | void * memset(void *s, int c, size_t n) |
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| 40 | { |
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| 41 | int skip, cnt, i; |
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| 42 | vec_uchar16 *vs; |
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| 43 | vec_uchar16 vc, mask, one = spu_splats((unsigned char)-1); |
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| 44 | |
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| 45 | vs = (vec_uchar16 *)(s); |
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| 46 | vc = spu_splats((unsigned char)c); |
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| 47 | cnt = (int)(n); |
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| 48 | |
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| 49 | /* Handle any leading partial quadwords as well a |
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| 50 | * very short settings (ie, such that the n characters |
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| 51 | * all reside in a single quadword. |
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| 52 | */ |
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| 53 | skip = (int)(s) & 15; |
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| 54 | if (skip) { |
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| 55 | mask = spu_rlmaskqwbyte(one, -skip); |
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| 56 | cnt -= 16 - skip; |
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| 57 | if (cnt < 0) { |
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| 58 | mask = spu_and(mask, spu_slqwbyte(one, (unsigned int)(-cnt))); |
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| 59 | } |
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| 60 | *vs = spu_sel(*vs, vc, mask); |
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| 61 | vs++; |
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| 62 | } |
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| 63 | |
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| 64 | /* Handle 8 quadwords at a time |
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| 65 | */ |
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| 66 | for (i=127; i<cnt; cnt-=8*16) { |
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| 67 | vs[0] = vc; |
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| 68 | vs[1] = vc; |
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| 69 | vs[2] = vc; |
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| 70 | vs[3] = vc; |
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| 71 | vs[4] = vc; |
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| 72 | vs[5] = vc; |
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| 73 | vs[6] = vc; |
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| 74 | vs[7] = vc; |
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| 75 | vs += 8; |
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| 76 | } |
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| 77 | |
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| 78 | /* Finish all remaining complete quadwords |
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| 79 | */ |
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| 80 | for (i=15; i<cnt; cnt-=16) *vs++ = vc; |
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| 81 | |
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| 82 | /* Handle any trailing partial quadwords |
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| 83 | */ |
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| 84 | if (cnt > 0) { |
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| 85 | mask = spu_slqwbyte(one, (unsigned int)(16-cnt)); |
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| 86 | *vs = spu_sel(*vs, vc, mask); |
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| 87 | } |
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| 88 | |
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| 89 | return (s); |
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| 90 | } |
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