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/memcpy.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 | #if defined (__ARCHS__) |
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39 | |
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40 | #ifdef __LITTLE_ENDIAN__ |
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41 | # define SHIFT_1(RX,RY,IMM) asl RX, RY, IMM ; << |
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42 | # define SHIFT_2(RX,RY,IMM) lsr RX, RY, IMM ; >> |
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43 | # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM |
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44 | # define MERGE_2(RX,RY,IMM) |
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45 | # define EXTRACT_1(RX,RY,IMM) and RX, RY, 0xFFFF |
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46 | # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, IMM |
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47 | #else |
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48 | # define SHIFT_1(RX,RY,IMM) lsr RX, RY, IMM ; >> |
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49 | # define SHIFT_2(RX,RY,IMM) asl RX, RY, IMM ; << |
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50 | # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM ; << |
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51 | # define MERGE_2(RX,RY,IMM) asl RX, RY, IMM ; << |
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52 | # define EXTRACT_1(RX,RY,IMM) lsr RX, RY, IMM |
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53 | # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, 0x08 |
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54 | #endif |
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55 | |
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56 | #ifdef __ARC_LL64__ |
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57 | # define PREFETCH_READ(RX) prefetch [RX, 56] |
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58 | # define PREFETCH_WRITE(RX) prefetchw [RX, 64] |
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59 | # define LOADX(DST,RX) ldd.ab DST, [RX, 8] |
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60 | # define STOREX(SRC,RX) std.ab SRC, [RX, 8] |
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61 | # define ZOLSHFT 5 |
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62 | # define ZOLAND 0x1F |
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63 | #else |
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64 | # define PREFETCH_READ(RX) prefetch [RX, 28] |
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65 | # define PREFETCH_WRITE(RX) prefetchw [RX, 32] |
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66 | # define LOADX(DST,RX) ld.ab DST, [RX, 4] |
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67 | # define STOREX(SRC,RX) st.ab SRC, [RX, 4] |
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68 | # define ZOLSHFT 4 |
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69 | # define ZOLAND 0xF |
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70 | #endif |
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71 | |
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72 | #ifdef __ARC_ALIGNED_ACCESS__ |
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73 | ENTRY (memcpy) |
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74 | prefetch [r1] ; Prefetch the read location |
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75 | prefetchw [r0] ; Prefetch the write location |
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76 | mov.f 0, r2 |
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77 | ; if size is zero |
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78 | jz.d [blink] |
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79 | mov r3, r0 ; don't clobber ret val |
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80 | |
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81 | ; if size <= 8 |
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82 | cmp r2, 8 |
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83 | bls.d @.Lsmallchunk |
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84 | mov.f lp_count, r2 |
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85 | |
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86 | and.f r4, r0, 0x03 |
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87 | rsub lp_count, r4, 4 |
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88 | lpnz @.Laligndestination |
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89 | ; LOOP BEGIN |
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90 | ldb.ab r5, [r1,1] |
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91 | sub r2, r2, 1 |
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92 | stb.ab r5, [r3,1] |
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93 | .Laligndestination: |
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94 | |
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95 | ; Check the alignment of the source |
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96 | and.f r4, r1, 0x03 |
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97 | bnz.d @.Lsourceunaligned |
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98 | |
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99 | ; CASE 0: Both source and destination are 32bit aligned |
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100 | ; Convert len to Dwords, unfold x4 |
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101 | lsr.f lp_count, r2, ZOLSHFT |
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102 | lpnz @.Lcopy32_64bytes |
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103 | ; LOOP START |
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104 | LOADX (r6, r1) |
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105 | PREFETCH_READ (r1) |
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106 | PREFETCH_WRITE (r3) |
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107 | LOADX (r8, r1) |
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108 | LOADX (r10, r1) |
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109 | LOADX (r4, r1) |
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110 | STOREX (r6, r3) |
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111 | STOREX (r8, r3) |
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112 | STOREX (r10, r3) |
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113 | STOREX (r4, r3) |
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114 | .Lcopy32_64bytes: |
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115 | |
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116 | and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes |
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117 | .Lsmallchunk: |
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118 | lpnz @.Lcopyremainingbytes |
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119 | ; LOOP START |
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120 | ldb.ab r5, [r1,1] |
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121 | stb.ab r5, [r3,1] |
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122 | .Lcopyremainingbytes: |
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123 | |
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124 | j [blink] |
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125 | ; END CASE 0 |
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126 | |
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127 | .Lsourceunaligned: |
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128 | cmp r4, 2 |
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129 | beq.d @.LunalignedOffby2 |
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130 | sub r2, r2, 1 |
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131 | |
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132 | bhi.d @.LunalignedOffby3 |
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133 | ldb.ab r5, [r1, 1] |
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134 | |
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135 | ; CASE 1: The source is unaligned, off by 1 |
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136 | ; Hence I need to read 1 byte for a 16bit alignment |
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137 | ; and 2bytes to reach 32bit alignment |
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138 | ldh.ab r6, [r1, 2] |
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139 | sub r2, r2, 2 |
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140 | ; Convert to words, unfold x2 |
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141 | lsr.f lp_count, r2, 3 |
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142 | MERGE_1 (r6, r6, 8) |
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143 | MERGE_2 (r5, r5, 24) |
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144 | or r5, r5, r6 |
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145 | |
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146 | ; Both src and dst are aligned |
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147 | lpnz @.Lcopy8bytes_1 |
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148 | ; LOOP START |
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149 | ld.ab r6, [r1, 4] |
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150 | prefetch [r1, 28] ;Prefetch the next read location |
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151 | ld.ab r8, [r1,4] |
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152 | prefetchw [r3, 32] ;Prefetch the next write location |
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153 | |
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154 | SHIFT_1 (r7, r6, 24) |
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155 | or r7, r7, r5 |
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156 | SHIFT_2 (r5, r6, 8) |
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157 | |
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158 | SHIFT_1 (r9, r8, 24) |
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159 | or r9, r9, r5 |
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160 | SHIFT_2 (r5, r8, 8) |
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161 | |
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162 | st.ab r7, [r3, 4] |
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163 | st.ab r9, [r3, 4] |
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164 | .Lcopy8bytes_1: |
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165 | |
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166 | ; Write back the remaining 16bits |
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167 | EXTRACT_1 (r6, r5, 16) |
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168 | sth.ab r6, [r3, 2] |
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169 | ; Write back the remaining 8bits |
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170 | EXTRACT_2 (r5, r5, 16) |
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171 | stb.ab r5, [r3, 1] |
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172 | |
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173 | and.f lp_count, r2, 0x07 ;Last 8bytes |
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174 | lpnz @.Lcopybytewise_1 |
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175 | ; LOOP START |
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176 | ldb.ab r6, [r1,1] |
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177 | stb.ab r6, [r3,1] |
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178 | .Lcopybytewise_1: |
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179 | j [blink] |
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180 | |
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181 | .LunalignedOffby2: |
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182 | ; CASE 2: The source is unaligned, off by 2 |
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183 | ldh.ab r5, [r1, 2] |
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184 | sub r2, r2, 1 |
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185 | |
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186 | ; Both src and dst are aligned |
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187 | ; Convert to words, unfold x2 |
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188 | lsr.f lp_count, r2, 3 |
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189 | #ifdef __BIG_ENDIAN__ |
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190 | asl.nz r5, r5, 16 |
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191 | #endif |
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192 | lpnz @.Lcopy8bytes_2 |
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193 | ; LOOP START |
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194 | ld.ab r6, [r1, 4] |
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195 | prefetch [r1, 28] ;Prefetch the next read location |
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196 | ld.ab r8, [r1,4] |
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197 | prefetchw [r3, 32] ;Prefetch the next write location |
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198 | |
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199 | SHIFT_1 (r7, r6, 16) |
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200 | or r7, r7, r5 |
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201 | SHIFT_2 (r5, r6, 16) |
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202 | |
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203 | SHIFT_1 (r9, r8, 16) |
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204 | or r9, r9, r5 |
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205 | SHIFT_2 (r5, r8, 16) |
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206 | |
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207 | st.ab r7, [r3, 4] |
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208 | st.ab r9, [r3, 4] |
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209 | .Lcopy8bytes_2: |
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210 | |
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211 | #ifdef __BIG_ENDIAN__ |
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212 | lsr.nz r5, r5, 16 |
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213 | #endif |
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214 | sth.ab r5, [r3, 2] |
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215 | |
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216 | and.f lp_count, r2, 0x07 ;Last 8bytes |
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217 | lpnz @.Lcopybytewise_2 |
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218 | ; LOOP START |
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219 | ldb.ab r6, [r1,1] |
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220 | stb.ab r6, [r3,1] |
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221 | .Lcopybytewise_2: |
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222 | j [blink] |
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223 | |
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224 | .LunalignedOffby3: |
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225 | ; CASE 3: The source is unaligned, off by 3 |
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226 | ; Hence, I need to read 1byte for achieve the 32bit alignment |
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227 | |
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228 | ; Both src and dst are aligned |
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229 | ; Convert to words, unfold x2 |
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230 | lsr.f lp_count, r2, 3 |
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231 | #ifdef __BIG_ENDIAN__ |
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232 | asl.ne r5, r5, 24 |
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233 | #endif |
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234 | lpnz @.Lcopy8bytes_3 |
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235 | ; LOOP START |
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236 | ld.ab r6, [r1, 4] |
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237 | prefetch [r1, 28] ;Prefetch the next read location |
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238 | ld.ab r8, [r1,4] |
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239 | prefetchw [r3, 32] ;Prefetch the next write location |
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240 | |
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241 | SHIFT_1 (r7, r6, 8) |
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242 | or r7, r7, r5 |
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243 | SHIFT_2 (r5, r6, 24) |
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244 | |
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245 | SHIFT_1 (r9, r8, 8) |
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246 | or r9, r9, r5 |
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247 | SHIFT_2 (r5, r8, 24) |
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248 | |
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249 | st.ab r7, [r3, 4] |
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250 | st.ab r9, [r3, 4] |
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251 | .Lcopy8bytes_3: |
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252 | |
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253 | #ifdef __BIG_ENDIAN__ |
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254 | lsr.nz r5, r5, 24 |
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255 | #endif |
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256 | stb.ab r5, [r3, 1] |
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257 | |
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258 | and.f lp_count, r2, 0x07 ;Last 8bytes |
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259 | lpnz @.Lcopybytewise_3 |
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260 | ; LOOP START |
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261 | ldb.ab r6, [r1,1] |
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262 | stb.ab r6, [r3,1] |
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263 | .Lcopybytewise_3: |
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264 | j [blink] |
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265 | |
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266 | ENDFUNC (memcpy) |
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267 | |
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268 | #else |
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269 | |
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270 | ENTRY(memcpy) |
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271 | prefetch [r1] ; Prefetch the read location |
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272 | prefetchw [r0] ; Prefetch the write location |
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273 | mov.f 0, r2 |
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274 | ;;; if size is zero |
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275 | jz.d [blink] |
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276 | mov r3, r0 ; don't clobber ret val |
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277 | |
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278 | ;;; if size <= 8 |
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279 | cmp r2, 8 |
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280 | bls.d @.Lsmallchunk |
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281 | mov.f lp_count, r2 |
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282 | |
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283 | ;;; Convert len to Dwords, unfold x4 |
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284 | lsr.f lp_count, r2, ZOLSHFT |
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285 | lpnz @.Lcopyfast |
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286 | ;; LOOP START |
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287 | LOADX (r6, r1) |
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288 | PREFETCH_READ (r1) |
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289 | PREFETCH_WRITE (r3) |
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290 | LOADX (r8, r1) |
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291 | LOADX (r10, r1) |
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292 | LOADX (r4, r1) |
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293 | STOREX (r6, r3) |
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294 | STOREX (r8, r3) |
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295 | STOREX (r10, r3) |
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296 | STOREX (r4, r3) |
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297 | .Lcopyfast: |
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298 | |
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299 | #ifdef __ARC_LL64__ |
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300 | and r2, r2, ZOLAND ;Remaining 31 bytes |
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301 | lsr.f lp_count, r2, 3 ;Convert to 64-bit words. |
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302 | lpnz @.Lcopy64b |
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303 | ;; LOOP START |
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304 | ldd.ab r6,[r1,8] |
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305 | std.ab r6,[r3,8] |
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306 | .Lcopy64b: |
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307 | |
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308 | and.f lp_count, r2, 0x07 ; Last 7 bytes |
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309 | #else |
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310 | and.f lp_count, r2, ZOLAND |
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311 | #endif |
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312 | |
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313 | .Lsmallchunk: |
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314 | lpnz @.Lcopyremainingbytes |
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315 | ;; LOOP START |
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316 | ldb.ab r5, [r1,1] |
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317 | stb.ab r5, [r3,1] |
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318 | .Lcopyremainingbytes: |
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319 | |
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320 | j [blink] |
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321 | |
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322 | ENDFUNC(memcpy) |
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323 | #endif |
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324 | |
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325 | #endif /* __ARCHS__ */ |
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326 | |
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327 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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