---
name: "llc-22"
section: "1"
platform: "linux"
package: "llvm-22"
version: "1:22.1.8-1~deb13u4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/llc-22"
---

# llc-22(1)

LLVM static compiler

## 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 executable.

The choice of architecture for the output assembly code is automatically 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. Otherwise, it will read from **filename**.  Inputs can be in either the LLVM assembly 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 specified, then **llc** creates the output filename by taking the input filename, 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.

- **-M**

  Pass target-specific InstPrinter options. Refer to the **-M** option of *[llvm-objdump(1)](/llvm-objdump/1.md).*

- **-o \<filename\>**

  *Use* **\<filename\>** *as the output filename. See the summary above for more* *details.*

- **-O=uint**

  *Generate code at different optimization levels.  These correspond 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, overriding 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 testing).*

  *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 insignificant.*

- **--enable-no-trapping-fp-math**

  *Enable setting the FP exceptions build attribute not to use exceptions.*

- **--stats**

  *Print statistics recorded by code-generation passes.*

- **--save-stats, --save-stats=cwd, --save-stats=obj**

  *Save LLVM statistics to a file in the current directory* *(--save-stats/”–save-stats=cwd”) or the directory* *of the output file (”–save-stats=obj”) in JSON format.*

- **--time-passes**

  *Record the amount of time needed for each pass and print a report to standard* *error.*

- **--load=\<dso\_path\>**

  *Dynamically load* **dso\_path** *(a path to a dynamically shared object) that* *implements an LLVM target.  This will permit the target 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 versions are gnu,* *4 and 5.  Default value (default) depends on the triple.*

- **-stack-size-section**

  *Emit the .stack\_sizes section which contains stack size metadata. 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 function 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 allocators 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 register 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 default) 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)](/lli/1.md)*

## AUTHOR

*Maintained by the LLVM Team (https://llvm.org/).*

## COPYRIGHT

*2003-2026, LLVM Project*