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annotate docs/CommandGuide/llc.rst @ 136:6cd7e602c98b

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Fix compile error to update llvm 5.0.1
author mir3636
date Sat, 17 Feb 2018 11:50:31 +0900
parents 3a76565eade5
children c2174574ed3a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 llc - LLVM static compiler
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2 ==========================
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3
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4 SYNOPSIS
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5 --------
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6
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7 :program:`llc` [*options*] [*filename*]
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8
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9 DESCRIPTION
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10 -----------
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11
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12 The :program:`llc` command compiles LLVM source inputs into assembly language
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13 for a specified architecture. The assembly language output can then be passed
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14 through a native assembler and linker to generate a native executable.
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15
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16 The choice of architecture for the output assembly code is automatically
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17 determined from the input file, unless the :option:`-march` option is used to
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18 override the default.
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19
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20 OPTIONS
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21 -------
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22
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23 If ``filename`` is "``-``" or omitted, :program:`llc` reads from standard input.
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24 Otherwise, it will from ``filename``. Inputs can be in either the LLVM assembly
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25 language format (``.ll``) or the LLVM bitcode format (``.bc``).
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26
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27 If the :option:`-o` option is omitted, then :program:`llc` will send its output
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28 to standard output if the input is from standard input. If the :option:`-o`
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29 option specifies "``-``", then the output will also be sent to standard output.
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30
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31 If no :option:`-o` option is specified and an input file other than "``-``" is
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32 specified, then :program:`llc` creates the output filename by taking the input
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33 filename, removing any existing ``.bc`` extension, and adding a ``.s`` suffix.
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34
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35 Other :program:`llc` options are described below.
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36
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37 End-user Options
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38 ~~~~~~~~~~~~~~~~
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39
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40 .. option:: -help
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41
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42 Print a summary of command line options.
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43
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44 .. option:: -O=uint
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45
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46 Generate code at different optimization levels. These correspond to the
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47 ``-O0``, ``-O1``, ``-O2``, and ``-O3`` optimization levels used by
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48 :program:`clang`.
0
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49
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50 .. option:: -mtriple=<target triple>
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51
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52 Override the target triple specified in the input file with the specified
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53 string.
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54
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55 .. option:: -march=<arch>
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56
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57 Specify the architecture for which to generate assembly, overriding the target
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58 encoded in the input file. See the output of ``llc -help`` for a list of
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59 valid architectures. By default this is inferred from the target triple or
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60 autodetected to the current architecture.
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61
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62 .. option:: -mcpu=<cpuname>
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63
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64 Specify a specific chip in the current architecture to generate code for.
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65 By default this is inferred from the target triple and autodetected to
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66 the current architecture. For a list of available CPUs, use:
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67
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68 .. code-block:: none
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69
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70 llvm-as < /dev/null | llc -march=xyz -mcpu=help
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71
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72 .. option:: -filetype=<output file type>
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73
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74 Specify what kind of output ``llc`` should generated. Options are: ``asm``
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75 for textual assembly ( ``'.s'``), ``obj`` for native object files (``'.o'``)
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76 and ``null`` for not emitting anything (for performance testing).
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77
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78 Note that not all targets support all options.
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79
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80 .. option:: -mattr=a1,+a2,-a3,...
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81
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82 Override or control specific attributes of the target, such as whether SIMD
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83 operations are enabled or not. The default set of attributes is set by the
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84 current CPU. For a list of available attributes, use:
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85
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86 .. code-block:: none
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87
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88 llvm-as < /dev/null | llc -march=xyz -mattr=help
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89
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90 .. option:: --disable-fp-elim
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91
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92 Disable frame pointer elimination optimization.
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93
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94 .. option:: --disable-excess-fp-precision
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95
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96 Disable optimizations that may produce excess precision for floating point.
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97 Note that this option can dramatically slow down code on some systems
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98 (e.g. X86).
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99
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100 .. option:: --enable-no-infs-fp-math
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101
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102 Enable optimizations that assume no Inf values.
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103
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104 .. option:: --enable-no-nans-fp-math
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105
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106 Enable optimizations that assume no NAN values.
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107
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108 .. option:: --enable-unsafe-fp-math
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109
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110 Enable optimizations that make unsafe assumptions about IEEE math (e.g. that
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111 addition is associative) or may not work for all input ranges. These
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112 optimizations allow the code generator to make use of some instructions which
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113 would otherwise not be usable (such as ``fsin`` on X86).
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114
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115 .. option:: --stats
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116
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117 Print statistics recorded by code-generation passes.
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118
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119 .. option:: --time-passes
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120
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121 Record the amount of time needed for each pass and print a report to standard
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122 error.
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123
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124 .. option:: --load=<dso_path>
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125
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126 Dynamically load ``dso_path`` (a path to a dynamically shared object) that
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127 implements an LLVM target. This will permit the target name to be used with
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128 the :option:`-march` option so that code can be generated for that target.
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129
100
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130 .. option:: -meabi=[default|gnu|4|5]
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131
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132 Specify which EABI version should conform to. Valid EABI versions are *gnu*,
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133 *4* and *5*. Default value (*default*) depends on the triple.
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134
134
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135 .. option:: -stack-size-section
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136
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137 Emit the .stack_sizes section which contains stack size metadata. The section
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138 contains an array of pairs of function symbol values (pointer size) and stack
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139 sizes (unsigned LEB128). The stack size values only include the space allocated
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140 in the function prologue. Functions with dynamic stack allocations are not
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141 included.
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142
100
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143
0
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144 Tuning/Configuration Options
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145 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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146
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147 .. option:: --print-machineinstrs
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148
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149 Print generated machine code between compilation phases (useful for debugging).
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150
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151 .. option:: --regalloc=<allocator>
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152
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153 Specify the register allocator to use.
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154 Valid register allocators are:
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155
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156 *basic*
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157
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158 Basic register allocator.
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159
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160 *fast*
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161
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162 Fast register allocator. It is the default for unoptimized code.
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163
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164 *greedy*
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165
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166 Greedy register allocator. It is the default for optimized code.
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167
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168 *pbqp*
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169
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170 Register allocator based on 'Partitioned Boolean Quadratic Programming'.
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171
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172 .. option:: --spiller=<spiller>
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173
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174 Specify the spiller to use for register allocators that support it. Currently
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175 this option is used only by the linear scan register allocator. The default
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176 ``spiller`` is *local*. Valid spillers are:
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177
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178 *simple*
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179
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180 Simple spiller
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181
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182 *local*
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183
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184 Local spiller
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185
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186 Intel IA-32-specific Options
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187 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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188
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189 .. option:: --x86-asm-syntax=[att|intel]
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190
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191 Specify whether to emit assembly code in AT&T syntax (the default) or Intel
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192 syntax.
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193
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194 EXIT STATUS
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195 -----------
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196
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197 If :program:`llc` succeeds, it will exit with 0. Otherwise, if an error
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198 occurs, it will exit with a non-zero value.
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199
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200 SEE ALSO
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201 --------
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202
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203 lli
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204