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1 // picoChip ASM file
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2 //.file "popcounthi2.S"
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3 //
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4 // Support for 16-bit population count.
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5 //
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6 // Copyright (C) 2003, 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
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7 // Contributed by picoChip Designs Ltd.
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8 // Maintained by Daniel Towner (daniel.towner@picochip.com)
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9 //
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10 // This file is free software; you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by the
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12 // Free Software Foundation; either version 3, or (at your option) any
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13 // later version.
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14 //
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15 // This file is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 // General Public License for more details.
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19 //
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20 // Under Section 7 of GPL version 3, you are granted additional
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21 // permissions described in the GCC Runtime Library Exception, version
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22 // 3.1, as published by the Free Software Foundation.
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23 //
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24 // You should have received a copy of the GNU General Public License and
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25 // a copy of the GCC Runtime Library Exception along with this program;
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26 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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27 // <http://www.gnu.org/licenses/>.
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28
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29 .section .text
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30
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31 // The following code (taken from a newsgroup posting) was compiled, and then
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32 // hand assembled (a similar version is given in the Hacker's Delight
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33 // book, chapter 5).
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34 //
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35 // int
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36 // popcount (int value)
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37 // {
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38 // value = ((value & 0xAAAA) >> 1) + (value & 0x5555);
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39 // value = ((value & 0xCCCC) >> 2) + (value & 0x3333);
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40 // value = ((value & 0xF0F0) >> 4) + (value & 0x0F0F);
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41 // return ((value & 0xFF00) >> 8) + (value & 0x00FF);
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42 // }
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43 //
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44 // This assembly function is approx. 20x faster than a naive loop
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45 // implementation of the population count, but about 30% bigger
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46 // (45 bytes v. 34 bytes).
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47
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48 .align 8
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49 .global ___popcounthi2
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50 ___popcounthi2:
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51
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52 _picoMark_FUNCTION_BEGIN=
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53
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54 // picoChip Function Prologue : &___popcounthi2 = 0 bytes
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55
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56 AND.0 [LSR R0,1],21845,R0 \ AND.1 R0,21845,R5
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57 ADD.0 R0,R5,R0
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58 AND.0 [LSR R0,2],13107,R0 \ AND.1 R0,13107,R5
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59 ADD.0 R0,R5,R0 \ COPY.1 1807,R2
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60 AND.0 [LSR R0,4],R2,R0 \ AND.1 R0,3855,R5
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61 ADD.0 R0,R5,R0
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62 JR (R12) \ AND.0 R0, 255, R5
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63 =-> ADD.0 [LSR R0,8],R5,R0
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64
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65 _picoMark_FUNCTION_END=
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66 // picoChip Function Epilogue : ___popcounthi2
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67 //============================================================================
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68 // All DWARF information between this marker, and the END OF DWARF
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69 // marker should be included in the source file. Search for
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70 // FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
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71 // provide the relevent information. Add markers called
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72 // _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
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73 // function in question.
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74 //============================================================================
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75
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76 //============================================================================
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77 // Frame information.
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78 //============================================================================
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79
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80 .section .debug_frame
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81 _picoMark_DebugFrame=
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82
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83 // Common CIE header.
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84 .unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
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85 _picoMark_CieBegin=
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86 .unalignedInitLong 0xffffffff
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87 .initByte 0x1 // CIE Version
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88 .ascii 16#0# // CIE Augmentation
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89 .uleb128 0x1 // CIE Code Alignment Factor
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90 .sleb128 2 // CIE Data Alignment Factor
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91 .initByte 0xc // CIE RA Column
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92 .initByte 0xc // DW_CFA_def_cfa
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93 .uleb128 0xd
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94 .uleb128 0x0
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95 .align 2
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96 _picoMark_CieEnd=
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97
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98 // FDE
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99 _picoMark_LSFDE0I900821033007563=
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100 .unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
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101 _picoMark_FdeBegin=
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102 .unalignedInitLong _picoMark_DebugFrame // FDE CIE offset
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103 .unalignedInitWord _picoMark_FUNCTION_BEGIN // FDE initial location
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104 .unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
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105 .initByte 0xe // DW_CFA_def_cfa_offset
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106 .uleb128 0x0 // <-- FUNCTION_STACK_SIZE_GOES_HERE
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107 .initByte 0x4 // DW_CFA_advance_loc4
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108 .unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
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109 .initByte 0xe // DW_CFA_def_cfa_offset
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110 .uleb128 0x0
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111 .align 2
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112 _picoMark_FdeEnd=
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113
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114 //============================================================================
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115 // Abbrevation information.
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116 //============================================================================
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117
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118 .section .debug_abbrev
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119 _picoMark_ABBREVIATIONS=
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120
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121 .section .debug_abbrev
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122 .uleb128 0x1 // (abbrev code)
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123 .uleb128 0x11 // (TAG: DW_TAG_compile_unit)
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124 .initByte 0x1 // DW_children_yes
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125 .uleb128 0x10 // (DW_AT_stmt_list)
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126 .uleb128 0x6 // (DW_FORM_data4)
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127 .uleb128 0x12 // (DW_AT_high_pc)
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128 .uleb128 0x1 // (DW_FORM_addr)
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129 .uleb128 0x11 // (DW_AT_low_pc)
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130 .uleb128 0x1 // (DW_FORM_addr)
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131 .uleb128 0x25 // (DW_AT_producer)
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132 .uleb128 0x8 // (DW_FORM_string)
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133 .uleb128 0x13 // (DW_AT_language)
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134 .uleb128 0x5 // (DW_FORM_data2)
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135 .uleb128 0x3 // (DW_AT_name)
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136 .uleb128 0x8 // (DW_FORM_string)
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137 .initByte 0x0
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138 .initByte 0x0
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139
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140 .uleb128 0x2 ;# (abbrev code)
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141 .uleb128 0x2e ;# (TAG: DW_TAG_subprogram)
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142 .initByte 0x0 ;# DW_children_no
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143 .uleb128 0x3 ;# (DW_AT_name)
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144 .uleb128 0x8 ;# (DW_FORM_string)
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145 .uleb128 0x11 ;# (DW_AT_low_pc)
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146 .uleb128 0x1 ;# (DW_FORM_addr)
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147 .uleb128 0x12 ;# (DW_AT_high_pc)
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148 .uleb128 0x1 ;# (DW_FORM_addr)
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149 .initByte 0x0
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150 .initByte 0x0
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151
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152 .initByte 0x0
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153
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154 //============================================================================
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155 // Line information. DwarfLib requires this to be present, but it can
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156 // be empty.
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157 //============================================================================
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158
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159 .section .debug_line
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160 _picoMark_LINES=
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161
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162 //============================================================================
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163 // Debug Information
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164 //============================================================================
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165 .section .debug_info
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166
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167 //Fixed header.
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168 .unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
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169 _picoMark_DEBUG_INFO_BEGIN=
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170 .unalignedInitWord 0x2
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171 .unalignedInitLong _picoMark_ABBREVIATIONS
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172 .initByte 0x2
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173
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174 // Compile unit information.
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175 .uleb128 0x1 // (DIE 0xb) DW_TAG_compile_unit)
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176 .unalignedInitLong _picoMark_LINES
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177 .unalignedInitWord _picoMark_FUNCTION_END
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178 .unalignedInitWord _picoMark_FUNCTION_BEGIN
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179 // Producer is `picoChip'
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180 .ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
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181 .unalignedInitWord 0xcafe // ASM language
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182 .ascii 16#0# // Name. DwarfLib expects this to be present.
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183
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184 .uleb128 0x2 ;# (DIE DW_TAG_subprogram)
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185
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186 // FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
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187 // digit is specified using the format 16#XX#
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188 .ascii 16#5f# 16#5f# 16#70# 16#6f# 16#70# 16#63# 16#6f# 16#75# 16#6e# 16#74# 16#68# 16#69# 16#32# 16#0# // Function name `__popcounthi2'
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189 .unalignedInitWord _picoMark_FUNCTION_BEGIN // DW_AT_low_pc
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190 .unalignedInitWord _picoMark_FUNCTION_END // DW_AT_high_pc
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191
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192 .initByte 0x0 // end of compile unit children.
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193
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194 _picoMark_DEBUG_INFO_END=
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195
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196 //============================================================================
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197 // END OF DWARF
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198 //============================================================================
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199
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200 .section .endFile
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201 // End of picoChip ASM file
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