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/strlen.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 | #if (defined (__ARC700__) || defined (__ARCEM__) || defined (__ARCHS__)) \ |
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38 | && defined (__ARC_NORM__) && defined (__ARC_BARREL_SHIFTER__) |
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39 | |
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40 | ENTRY (strlen) |
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41 | or r3,r0,7 |
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42 | ld r2,[r3,-7] |
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43 | ld.a r6,[r3,-3] |
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44 | mov r4,0x01010101 |
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45 | ; uses long immediate |
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46 | #ifdef __LITTLE_ENDIAN__ |
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47 | asl_s r1,r0,3 |
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48 | btst_s r0,2 |
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49 | asl r7,r4,r1 |
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50 | ror r5,r4 |
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51 | sub r1,r2,r7 |
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52 | bic_s r1,r1,r2 |
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53 | mov.eq r7,r4 |
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54 | sub r12,r6,r7 |
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55 | bic r12,r12,r6 |
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56 | or.eq r12,r12,r1 |
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57 | and r12,r12,r5 |
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58 | brne r12,0,.Learly_end |
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59 | #else /* BIG ENDIAN */ |
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60 | ror r5,r4 |
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61 | btst_s r0,2 |
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62 | mov_s r1,31 |
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63 | sub3 r7,r1,r0 |
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64 | sub r1,r2,r4 |
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65 | bic_s r1,r1,r2 |
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66 | bmsk r1,r1,r7 |
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67 | sub r12,r6,r4 |
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68 | bic r12,r12,r6 |
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69 | bmsk.ne r12,r12,r7 |
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70 | or.eq r12,r12,r1 |
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71 | and r12,r12,r5 |
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72 | brne r12,0,.Learly_end |
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73 | #endif /* ENDIAN */ |
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74 | |
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75 | .Loop: |
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76 | ld_s r2,[r3,4] |
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77 | ld.a r6,[r3,8] |
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78 | ; stall for load result |
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79 | sub r1,r2,r4 |
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80 | bic_s r1,r1,r2 |
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81 | sub r12,r6,r4 |
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82 | bic r12,r12,r6 |
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83 | or_l r12,r12,r1 |
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84 | and r12,r12,r5 |
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85 | breq_l r12,0,.Loop |
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86 | .Lend: |
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87 | and.f r1,r1,r5 |
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88 | sub.ne r3,r3,4 |
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89 | mov.eq r1,r12 |
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90 | #ifdef __LITTLE_ENDIAN__ |
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91 | sub_s r2,r1,1 |
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92 | bic_s r2,r2,r1 |
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93 | norm r1,r2 |
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94 | sub_s r0,r0,3 |
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95 | lsr_s r1,r1,3 |
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96 | sub r0,r3,r0 |
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97 | j_s.d [blink] |
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98 | sub_l r0,r0,r1 |
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99 | #else /* BIG ENDIAN */ |
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100 | lsr_s r1,r1,7 |
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101 | mov.eq r2,r6 |
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102 | bic_s r1,r1,r2 |
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103 | norm r1,r1 |
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104 | sub r0,r3,r0 |
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105 | lsr_s r1,r1,3 |
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106 | j_s.d [blink] |
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107 | add_l r0,r0,r1 |
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108 | #endif /* ENDIAN */ |
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109 | .Learly_end: |
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110 | b.d .Lend |
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111 | sub_s.ne r1,r1,r1 |
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112 | ENDFUNC (strlen) |
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113 | #endif /* (__ARC700__ || __ARCEM__ || __ARCHS__) && __ARC_NORM__ |
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114 | && __ARC_BARREL_SHIFTER__ */ |
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115 | |
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116 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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