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LLC(1) LLVM LLC(1) NAME llc - LLVM static compiler SYNOPSIS llc [options] [filename] DESCRIPTION The llc command compiles LLVM source inputs into assembly language for a specified architecture. The assembly language output can then be passed through a native assembler and linker to generate a native exe- cutable. The choice of architecture for the output assembly code is automati- cally determined from the input file, unless the -march option is used to override the default. OPTIONS If filename is "-" or omitted, llc reads from standard input. Other- wise, it will read from filename. Inputs can be in either the LLVM as- sembly language format (.ll) or the LLVM bitcode format (.bc). If the -o option is omitted, then llc will send its output to standard output if the input is from standard input. If the -o option specifies "-", then the output will also be sent to standard output. If no -o option is specified and an input file other than "-" is speci- fied, then llc creates the output filename by taking the input file- name, removing any existing .bc extension, and adding a .s suffix. Other llc options are described below. End-user Options -help Print a summary of command line options. -o <filename> Use <filename> as the output filename. See the summary above for more details. -O=uint Generate code at different optimization levels. These corre- spond to the -O0, -O1, -O2, and -O3 optimization levels used by clang. -mtriple=<target triple> Override the target triple specified in the input file with the specified string. -march=<arch> Specify the architecture for which to generate assembly, over- riding the target encoded in the input file. See the output of llc -help for a list of valid architectures. By default this is inferred from the target triple or autodetected to the current architecture. -mcpu=<cpuname> Specify a specific chip in the current architecture to generate code for. By default this is inferred from the target triple and autodetected to the current architecture. For a list of available CPUs, use: llvm-as < /dev/null | llc -march=xyz -mcpu=help -filetype=<output file type> Specify what kind of output llc should generated. Options are: asm for textual assembly ( '.s'), obj for native object files ('.o') and null for not emitting anything (for performance test- ing). Note that not all targets support all options. -mattr=a1,+a2,-a3,... Override or control specific attributes of the target, such as whether SIMD operations are enabled or not. The default set of attributes is set by the current CPU. For a list of available attributes, use: llvm-as < /dev/null | llc -march=xyz -mattr=help --frame-pointer Specify effect of frame pointer elimination optimization (all,non-leaf,none). --disable-excess-fp-precision Disable optimizations that may produce excess precision for floating point. Note that this option can dramatically slow down code on some systems (e.g. X86). --enable-no-infs-fp-math Enable optimizations that assume no Inf values. --enable-no-nans-fp-math Enable optimizations that assume no NAN values. --enable-no-signed-zeros-fp-math Enable FP math optimizations that assume the sign of 0 is in- significant. --enable-no-trapping-fp-math Enable setting the FP exceptions build attribute not to use ex- ceptions. --enable-unsafe-fp-math Enable optimizations that make unsafe assumptions about IEEE math (e.g. that addition is associative) or may not work for all input ranges. These optimizations allow the code generator to make use of some instructions which would otherwise not be us- able (such as fsin on X86). --stats Print statistics recorded by code-generation passes. --time-passes Record the amount of time needed for each pass and print a re- port to standard error. --load=<dso_path> Dynamically load dso_path (a path to a dynamically shared ob- ject) that implements an LLVM target. This will permit the tar- get name to be used with the -march option so that code can be generated for that target. -meabi=[default|gnu|4|5] Specify which EABI version should conform to. Valid EABI ver- sions are gnu, 4 and 5. Default value (default) depends on the triple. -stack-size-section Emit the .stack_sizes section which contains stack size meta- data. The section contains an array of pairs of function symbol values (pointer size) and stack sizes (unsigned LEB128). The stack size values only include the space allocated in the func- tion prologue. Functions with dynamic stack allocations are not included. -remarks-section Emit the __remarks (MachO) section which contains metadata about remark diagnostics. Tuning/Configuration Options --print-after-isel Print generated machine code after instruction selection (useful for debugging). --regalloc=<allocator> Specify the register allocator to use. Valid register alloca- tors are: basic Basic register allocator. fast Fast register allocator. It is the default for unoptimized code. greedy Greedy register allocator. It is the default for optimized code. pbqp Register allocator based on 'Partitioned Boolean Quadratic Programming'. --spiller=<spiller> Specify the spiller to use for register allocators that support it. Currently this option is used only by the linear scan reg- ister allocator. The default spiller is local. Valid spillers are: simple Simple spiller local Local spiller Intel IA-32-specific Options --x86-asm-syntax=[att|intel] Specify whether to emit assembly code in AT&T syntax (the de- fault) or Intel syntax. EXIT STATUS If llc succeeds, it will exit with 0. Otherwise, if an error occurs, it will exit with a non-zero value. SEE ALSO lli(1) AUTHOR Maintained by the LLVM Team (https://llvm.org/). COPYRIGHT 2003-2025, LLVM Project 18 2025-04-13 LLC(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | SEE ALSO | AUTHOR | COPYRIGHT
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