1 | /* |
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2 | Copyright (c) 2015, Synopsys, Inc. All rights reserved. |
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3 | |
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4 | Redistribution and use in source and binary forms, with or without |
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5 | modification, are permitted provided that the following conditions are met: |
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6 | |
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7 | 1) Redistributions of source code must retain the above copyright notice, |
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8 | this list of conditions and the following disclaimer. |
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9 | |
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10 | 2) Redistributions in binary form must reproduce the above copyright notice, |
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11 | this list of conditions and the following disclaimer in the documentation |
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12 | and/or other materials provided with the distribution. |
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13 | |
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14 | 3) Neither the name of the Synopsys, Inc., nor the names of its contributors |
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15 | may be used to endorse or promote products derived from this software |
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16 | without specific prior written permission. |
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17 | |
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18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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28 | POSSIBILITY OF SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | /* This implementation is optimized for performance. For code size a generic |
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32 | implementation of this function from newlib/libc/string/strcmp.c will be |
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33 | used. */ |
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34 | #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) |
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35 | |
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36 | #include "asm.h" |
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37 | |
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38 | #ifdef __ARCHS__ |
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39 | ENTRY (strcmp) |
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40 | or r2, r0, r1 |
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41 | bmsk_s r2, r2, 1 |
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42 | brne r2, 0, @.Lcharloop |
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43 | |
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44 | ; s1 and s2 are word aligned |
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45 | ld.ab r2, [r0, 4] |
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46 | |
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47 | mov_s r12, 0x01010101 |
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48 | ror r11, r12 |
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49 | .align 4 |
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50 | .LwordLoop: |
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51 | ld.ab r3, [r1, 4] |
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52 | ; Detect NULL char in str1 |
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53 | sub r4, r2, r12 |
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54 | ld.ab r5, [r0, 4] |
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55 | bic r4, r4, r2 |
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56 | and r4, r4, r11 |
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57 | brne.d.nt r4, 0, .LfoundNULL |
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58 | ; Check if the read locations are the same |
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59 | cmp r2, r3 |
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60 | beq.d .LwordLoop |
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61 | mov.eq r2, r5 |
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62 | |
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63 | ; A match is found, spot it out |
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64 | #ifdef __LITTLE_ENDIAN__ |
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65 | swape r3, r3 |
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66 | mov_s r0, 1 |
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67 | swape r2, r2 |
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68 | #else |
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69 | mov_s r0, 1 |
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70 | #endif |
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71 | cmp_s r2, r3 |
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72 | j_s.d [blink] |
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73 | bset.lo r0, r0, 31 |
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74 | |
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75 | .align 4 |
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76 | .LfoundNULL: |
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77 | #ifdef __BIG_ENDIAN__ |
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78 | swape r4, r4 |
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79 | swape r2, r2 |
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80 | swape r3, r3 |
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81 | #endif |
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82 | ; Find null byte |
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83 | ffs r0, r4 |
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84 | bmsk r2, r2, r0 |
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85 | bmsk r3, r3, r0 |
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86 | swape r2, r2 |
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87 | swape r3, r3 |
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88 | ; make the return value |
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89 | sub.f r0, r2, r3 |
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90 | mov.hi r0, 1 |
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91 | j_s.d [blink] |
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92 | bset.lo r0, r0, 31 |
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93 | |
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94 | .align 4 |
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95 | .Lcharloop: |
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96 | ldb.ab r2, [r0, 1] |
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97 | ldb.ab r3, [r1, 1] |
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98 | nop |
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99 | breq r2, 0, .Lcmpend |
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100 | breq r2, r3, .Lcharloop |
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101 | |
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102 | .align 4 |
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103 | .Lcmpend: |
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104 | j_s.d [blink] |
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105 | sub r0, r2, r3 |
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106 | ENDFUNC (strcmp) |
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107 | #endif /* __ARCHS__ */ |
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108 | |
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109 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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