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LLVM-MC(1) User Commands LLVM-MC(1)


llvm-mc - manual page for llvm-mc 4.0


OVERVIEW: llvm machine code playground

USAGE: llvm-mc [options] <input file>


General options:

-I=<directory> - Directory of include files

-aarch64-neon-syntax - Choose style of NEON code to emit from AArch64 backend:

- Emit generic NEON assembly
- Emit Apple-style NEON assembly

-amdgpu-dump-rtmd - Dump AMDGPU runtime metadata

-amdgpu-spill-sgpr-to-smem - Use scalar stores to spill SGPRs if supported by subtarget

-amdgpu-vgpr-index-mode - Use GPR indexing mode instead of movrel for vector indexing

-arch=<string> - Target arch to assemble for, see -version for available targets

-arm-execute-only -

-arm-implicit-it - Allow conditional instructions outdside of an IT block

- Accept in both ISAs, emit implicit ITs in Thumb
- Warn in ARM, reject in Thumb
- Accept in ARM, reject in Thumb
- Warn in ARM, emit implicit ITs in Thumb

-asm-instrumentation - Instrumentation of inline assembly and assembly source files

- no instrumentation at all
- instrument instructions with memory arguments

-asm-show-inst - Emit internal instruction representation to assembly file

-bounds-checking-single-trap - Use one trap block per function

-code-model - Choose code model

- Target default code model
- Small code model
- Kernel code model
- Medium code model
- Large code model

-color - use colored syntax highlighting (default=autodetect)

-compress-debug-sections - Choose DWARF debug sections compression:

- No compression
- Use zlib compression
- Use zlib-gnu compression (deprecated)

-cvp-dont-process-adds -

-defsym=<string> - Defines a symbol to be an integer constant

-disable-spill-fusing - Disable fusing of spill code into instructions

Action to perform:

-as-lex - Lex tokens from a .s file

-assemble - Assemble a .s file (default)

-disassemble - Disassemble strings of hex bytes

-mdis - Marked up disassembly of strings of hex bytes

-dwarf-version=<int> - Dwarf version

-enable-implicit-null-checks - Fold null checks into faulting memory operations

-enable-load-pre -

-enable-name-compression - Enable name string compression

-enable-objc-arc-opts - enable/disable all ARC Optimizations

-enable-scoped-noalias -

-enable-tbaa -

-exhaustive-register-search - Exhaustive Search for registers bypassing the depth and interference cutoffs of last chance recoloring

-expensive-combines - Enable expensive instruction combines

-fatal-warnings - Treat warnings as errors

-fdebug-compilation-dir=<string> - Specifies the debug info's compilation dir

-filetype - Choose an output file type:

- Emit an assembly ('.s') file
- Don't emit anything (for timing purposes)
- Emit a native object ('.o') file

-filter-print-funcs=<function names> - Only print IR for functions whose name match this for all print-[before|after][-all] options

-g - Generate dwarf debugging info for assembly source files

The default size is 8.

-hash-based-counter-split - Rename counter variable of a comdat function based on cfg hash

-ignore-empty-index-file - Ignore an empty index file and perform non-ThinLTO compilation

-imp-null-check-page-size=<int> - The page size of the target in bytes

-imp-null-max-insts-to-consider=<uint> - The max number of instructions to consider hoisting loads over (the algorithm is quadratic over this number)

-incremental-linker-compatible - When used with filetype=obj, emit an object file which can be used with an incremental linker

-internalize-public-api-file=<filename> - A file containing list of symbol names to preserve

-internalize-public-api-list=<list> - A list of symbol names to preserve

-join-liveintervals - Coalesce copies (default=true)

-limit-float-precision=<uint> - Generate low-precision inline sequences for some float libcalls

-lto-pass-remarks-output=<filename> - Output filename for pass remarks

-main-file-name=<string> - Specifies the name we should consider the input file

-mattr=<a1,+a2,-a3,...> - Target specific attributes (-mattr=help for details)

-mc-relax-all - When used with filetype=obj, relax all fixups in the emitted object file

-mcpu=<cpu-name> - Target a specific cpu type (-mcpu=help for details)

-merror-missing-parenthesis - Error for missing parenthesis around predicate registers

-merror-noncontigious-register - Error for register names that aren't contigious

-mfuture-regs - Enable future registers

-mips-compact-branches - MIPS Specific: Compact branch policy.

- Do not use compact branches if possible.
- Use compact branches where appropiate (default).
- Always use compact branches if possible.

-mips16-constant-islands - Enable mips16 constant islands.

-mips16-hard-float - Enable mips16 hard float.

-mno-compound - Disable looking for compound instructions for Hexagon

-mno-fixup - Disable fixing up resolved relocations for Hexagon

-mno-ldc1-sdc1 - Expand double precision loads and stores to their single precision counterparts

-mno-pairing - Disable looking for duplex instructions for Hexagon

-mwarn-missing-parenthesis - Warn for missing parenthesis around predicate registers

-mwarn-noncontigious-register - Warn for register names that arent contigious

-mwarn-sign-mismatch - Warn for mismatching a signed and unsigned value

-n - Don't assume assembly file starts in the text section

-no-deprecated-warn - Suppress all deprecated warnings

-no-discriminators - Disable generation of discriminator information.

-no-exec-stack - File doesn't need an exec stack

-no-warn - Suppress all warnings

-nvptx-sched4reg - NVPTX Specific: schedule for register pressue

-o=<filename> - Output filename

-output-asm-variant=<uint> - Syntax variant to use for output printing

-pie-copy-relocations - PIE Copy Relocations

-position-independent - Position independent

-preserve-comments - Preserve Comments in outputted assembly

-print-after-all - Print IR after each pass

-print-before-all - Print IR before each pass

-print-imm-hex - Prefer hex format for immediate values

-print-machineinstrs=<pass-name> - Print machine instrs

-r600-ir-structurize - Use StructurizeCFG IR pass

-rdf-dump -

-rdf-limit=<uint> -

-regalloc - Register allocator to use

- pick register allocator based on -O option
- PBQP register allocator
- greedy register allocator
- fast register allocator
- basic register allocator

-relax-relocations - Emit R_X86_64_GOTPCRELX instead of R_X86_64_GOTPCREL

-rewrite-map-file=<filename> - Symbol Rewrite Map

-rng-seed=<seed> - Seed for the random number generator

-sample-profile-check-record-coverage=<N> - Emit a warning if less than N% of records in the input profile are matched to the IR.

-sample-profile-check-sample-coverage=<N> - Emit a warning if less than N% of samples in the input profile are matched to the IR.

-sample-profile-inline-hot-threshold=<N> - Inlined functions that account for more than N% of all samples collected in the parent function, will be inlined again.

-sample-profile-max-propagate-iterations=<uint> - Maximum number of iterations to go through when propagating sample block/edge weights through the CFG.

-save-temp-labels - Don't discard temporary labels

-show-encoding - Show instruction encodings

-show-inst - Show internal instruction representation

-show-inst-operands - Show instructions operands as parsed

-stackmap-version=<int> - Specify the stackmap encoding version (default = 2)

-static-func-full-module-prefix - Use full module build paths in the profile counter names for static functions.

-stats - Enable statistics output from program (available with Asserts)

-stats-json - Display statistics as json data

-summary-file=<string> - The summary file to use for function importing.

-threads=<int> -

-time-passes - Time each pass, printing elapsed time for each on exit

-triple=<string> - Target triple to assemble for, see -version for available targets

-verify-debug-info -

-verify-dom-info - Verify dominator info (time consuming)

-verify-loop-info - Verify loop info (time consuming)

-verify-loop-lcssa - Verify loop lcssa form (time consuming)

-verify-machine-dom-info - Verify machine dominator info (time consuming)

-verify-regalloc - Verify during register allocation

-verify-region-info - Verify region info (time consuming)

-verify-scev - Verify ScalarEvolution's backedge taken counts (slow)

-verify-scev-maps - Verify no dangling value in ScalarEvolution's ExprValueMap (slow)

-vp-counters-per-site=<number> - The average number of profile counters allocated per value profiling site.

-vp-static-alloc - Do static counter allocation for value profiler

-x86-asm-syntax - Choose style of code to emit from X86 backend:

- Emit AT&T-style assembly
- Emit Intel-style assembly

Generic Options:

-help - Display available options (-help-hidden for more)

-help-list - Display list of available options (-help-list-hidden for more)

-version - Display the version of this program


The full documentation for llvm-mc is maintained as a Texinfo manual. If the info and llvm-mc programs are properly installed at your site, the command

info llvm-mc

should give you access to the complete manual.

May 2018 llvm-mc 4.0