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 "vec_literal.h" |
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35 | |
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36 | /* Compare the two strings s1 and s2. Return an integer less than, equal |
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37 | * to, or greater than zero if s1 is found, respectively, to be less than, |
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38 | * to match, or be greater than s2. |
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39 | */ |
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40 | |
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41 | int strcmp(const char *s1, const char *s2) |
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42 | { |
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43 | unsigned int offset1, offset2; |
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44 | vec_uint4 gt_v, lt_v, mask_v; |
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45 | vec_uint4 cnt1_v, cnt2_v; |
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46 | vec_uint4 end1_v, end2_v, end_v, neq_v; |
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47 | vec_uchar16 shuffle1, shuffle2; |
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48 | vec_uchar16 data1A, data1B, data1, data2A, data2B, data2; |
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49 | vec_uchar16 *ptr1, *ptr2; |
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50 | |
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51 | ptr1 = (vec_uchar16 *)s1; |
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52 | ptr2 = (vec_uchar16 *)s2; |
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53 | |
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54 | offset1 = (unsigned int)(ptr1) & 15; |
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55 | offset2 = (unsigned int)(ptr2) & 15; |
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56 | |
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57 | shuffle1 = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char)offset1), |
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58 | VEC_LITERAL(vec_uint4, 0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F)); |
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59 | shuffle2 = (vec_uchar16)spu_add((vec_uint4)spu_splats((unsigned char)offset2), |
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60 | VEC_LITERAL(vec_uint4, 0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F)); |
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61 | |
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62 | data1A = *ptr1++; |
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63 | data2A = *ptr2++; |
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64 | |
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65 | do { |
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66 | data1B = *ptr1++; |
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67 | data2B = *ptr2++; |
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68 | |
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69 | data1 = spu_shuffle(data1A, data1B, shuffle1); |
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70 | data2 = spu_shuffle(data2A, data2B, shuffle2); |
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71 | |
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72 | data1A = data1B; |
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73 | data2A = data2B; |
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74 | |
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75 | neq_v = spu_gather(spu_xor(spu_cmpeq(data1, data2), -1)); |
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76 | |
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77 | end1_v = spu_gather(spu_cmpeq(data1, 0)); |
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78 | end2_v = spu_gather(spu_cmpeq(data2, 0)); |
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79 | end_v = spu_or(end1_v, end2_v), 0; |
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80 | } while (spu_extract(spu_or(end_v, neq_v), 0) == 0); |
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81 | |
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82 | cnt1_v = spu_cntlz(end1_v); |
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83 | cnt2_v = spu_cntlz(end2_v); |
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84 | |
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85 | gt_v = spu_gather(spu_cmpgt(data1, data2)); |
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86 | lt_v = spu_gather(spu_cmpgt(data2, data1)); |
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87 | |
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88 | mask_v = spu_and(spu_cmpeq(cnt1_v, cnt2_v), |
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89 | spu_cmpeq(spu_rlmask(neq_v, (vec_int4)spu_add((vec_uint4)cnt1_v, -32)), 0)); |
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90 | |
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91 | gt_v = spu_sub(-1, spu_sl(spu_cmpgt(gt_v, lt_v), 1)); |
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92 | |
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93 | return (spu_extract(spu_andc(gt_v, mask_v), 0)); |
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94 | } |
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