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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