1 =pod 2 3 =head1 NAME 4 5 lli - directly execute programs from LLVM bitcode 6 7 =head1 SYNOPSIS 8 9 B<lli> [I<options>] [I<filename>] [I<program args>] 10 11 =head1 DESCRIPTION 12 13 B<lli> directly executes programs in LLVM bitcode format. It takes a program 14 in LLVM bitcode format and executes it using a just-in-time compiler, if one is 15 available for the current architecture, or an interpreter. B<lli> takes all of 16 the same code generator options as L<llc|llc>, but they are only effective when 17 B<lli> is using the just-in-time compiler. 18 19 If I<filename> is not specified, then B<lli> reads the LLVM bitcode for the 20 program from standard input. 21 22 The optional I<args> specified on the command line are passed to the program as 23 arguments. 24 25 =head1 GENERAL OPTIONS 26 27 =over 28 29 =item B<-fake-argv0>=I<executable> 30 31 Override the C<argv[0]> value passed into the executing program. 32 33 =item B<-force-interpreter>=I<{false,true}> 34 35 If set to true, use the interpreter even if a just-in-time compiler is available 36 for this architecture. Defaults to false. 37 38 =item B<-help> 39 40 Print a summary of command line options. 41 42 =item B<-load>=I<puginfilename> 43 44 Causes B<lli> to load the plugin (shared object) named I<pluginfilename> and use 45 it for optimization. 46 47 =item B<-stats> 48 49 Print statistics from the code-generation passes. This is only meaningful for 50 the just-in-time compiler, at present. 51 52 =item B<-time-passes> 53 54 Record the amount of time needed for each code-generation pass and print it to 55 standard error. 56 57 =item B<-version> 58 59 Print out the version of B<lli> and exit without doing anything else. 60 61 =back 62 63 =head1 TARGET OPTIONS 64 65 =over 66 67 =item B<-mtriple>=I<target triple> 68 69 Override the target triple specified in the input bitcode file with the 70 specified string. This may result in a crash if you pick an 71 architecture which is not compatible with the current system. 72 73 =item B<-march>=I<arch> 74 75 Specify the architecture for which to generate assembly, overriding the target 76 encoded in the bitcode file. See the output of B<llc -help> for a list of 77 valid architectures. By default this is inferred from the target triple or 78 autodetected to the current architecture. 79 80 =item B<-mcpu>=I<cpuname> 81 82 Specify a specific chip in the current architecture to generate code for. 83 By default this is inferred from the target triple and autodetected to 84 the current architecture. For a list of available CPUs, use: 85 B<llvm-as E<lt> /dev/null | llc -march=xyz -mcpu=help> 86 87 =item B<-mattr>=I<a1,+a2,-a3,...> 88 89 Override or control specific attributes of the target, such as whether SIMD 90 operations are enabled or not. The default set of attributes is set by the 91 current CPU. For a list of available attributes, use: 92 B<llvm-as E<lt> /dev/null | llc -march=xyz -mattr=help> 93 94 =back 95 96 97 =head1 FLOATING POINT OPTIONS 98 99 =over 100 101 =item B<-disable-excess-fp-precision> 102 103 Disable optimizations that may increase floating point precision. 104 105 =item B<-enable-no-infs-fp-math> 106 107 Enable optimizations that assume no Inf values. 108 109 =item B<-enable-no-nans-fp-math> 110 111 Enable optimizations that assume no NAN values. 112 113 =item B<-enable-unsafe-fp-math> 114 115 Causes B<lli> to enable optimizations that may decrease floating point 116 precision. 117 118 =item B<-soft-float> 119 120 Causes B<lli> to generate software floating point library calls instead of 121 equivalent hardware instructions. 122 123 =back 124 125 =head1 CODE GENERATION OPTIONS 126 127 =over 128 129 =item B<-code-model>=I<model> 130 131 Choose the code model from: 132 133 default: Target default code model 134 small: Small code model 135 kernel: Kernel code model 136 medium: Medium code model 137 large: Large code model 138 139 =item B<-disable-post-RA-scheduler> 140 141 Disable scheduling after register allocation. 142 143 =item B<-disable-spill-fusing> 144 145 Disable fusing of spill code into instructions. 146 147 =item B<-enable-correct-eh-support> 148 149 Make the -lowerinvoke pass insert expensive, but correct, EH code. 150 151 =item B<-jit-enable-eh> 152 153 Exception handling should be enabled in the just-in-time compiler. 154 155 =item B<-join-liveintervals> 156 157 Coalesce copies (default=true). 158 159 =item B<-nozero-initialized-in-bss> 160 Don't place zero-initialized symbols into the BSS section. 161 162 =item B<-pre-RA-sched>=I<scheduler> 163 164 Instruction schedulers available (before register allocation): 165 166 =default: Best scheduler for the target 167 =none: No scheduling: breadth first sequencing 168 =simple: Simple two pass scheduling: minimize critical path and maximize processor utilization 169 =simple-noitin: Simple two pass scheduling: Same as simple except using generic latency 170 =list-burr: Bottom-up register reduction list scheduling 171 =list-tdrr: Top-down register reduction list scheduling 172 =list-td: Top-down list scheduler -print-machineinstrs - Print generated machine code 173 174 =item B<-regalloc>=I<allocator> 175 176 Register allocator to use (default=linearscan) 177 178 =bigblock: Big-block register allocator 179 =linearscan: linear scan register allocator =local - local register allocator 180 =simple: simple register allocator 181 182 =item B<-relocation-model>=I<model> 183 184 Choose relocation model from: 185 186 =default: Target default relocation model 187 =static: Non-relocatable code =pic - Fully relocatable, position independent code 188 =dynamic-no-pic: Relocatable external references, non-relocatable code 189 190 =item B<-spiller> 191 192 Spiller to use (default=local) 193 194 =simple: simple spiller 195 =local: local spiller 196 197 =item B<-x86-asm-syntax>=I<syntax> 198 199 Choose style of code to emit from X86 backend: 200 201 =att: Emit AT&T-style assembly 202 =intel: Emit Intel-style assembly 203 204 =back 205 206 =head1 EXIT STATUS 207 208 If B<lli> fails to load the program, it will exit with an exit code of 1. 209 Otherwise, it will return the exit code of the program it executes. 210 211 =head1 SEE ALSO 212 213 L<llc|llc> 214 215 =head1 AUTHOR 216 217 Maintained by the LLVM Team (L<http://llvm.org/>). 218 219 =cut 220
