Provided by: llvm-12_12.0.0-3ubuntu1~20.04.5_amd64 
NAME
llvm-mc - manual page for llvm-mc 12
DESCRIPTION
OVERVIEW: llvm machine code playground
USAGE: llvm-mc [options] <input file>
OPTIONS:
Color Options:
--color - Use colors in output
(default=autodetect)
General options:
-I=<directory> - Directory of include files
--aarch64-neon-syntax=<value> - Choose style of NEON code to emit
from AArch64 backend:
=generic
- Emit generic NEON assembly
=apple - Emit Apple-style NEON assembly
--abort-on-max-devirt-iterations-reached - Abort when the max iterations for
devirtualization CGSCC repeat pass is reached
--amdgpu-bypass-slow-div - Skip 64-bit divide for dynamic 32-bit
values
--amdgpu-disable-loop-alignment - Do not align and prefetch loops
--amdgpu-disable-power-sched - Disable scheduling to minimize mAI
power bursts
--amdgpu-dpp-combine - Enable DPP combiner
--amdgpu-dump-hsa-metadata - Dump AMDGPU HSA Metadata
--amdgpu-enable-flat-scratch - Use flat scratch instructions
--amdgpu-enable-merge-m0 - Merge and hoist M0 initializations
--amdgpu-promote-alloca-to-vector-limit=<uint> - Maximum byte size to consider promote
alloca to vector
--amdgpu-reserve-vgpr-for-sgpr-spill - Allocates one VGPR for future SGPR
Spill
--amdgpu-sdwa-peephole - Enable SDWA peepholer
--amdgpu-use-aa-in-codegen - Enable the use of AA during codegen.
--amdgpu-verify-hsa-metadata - Verify AMDGPU HSA Metadata
--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-add-build-attributes -
--arm-implicit-it=<value> - Allow conditional instructions
outdside of an IT block
=always
- Accept in both ISAs, emit implicit ITs in Thumb
=never - Warn in ARM, reject in Thumb
=arm - Accept in ARM, reject in Thumb
=thumb - Warn in ARM, emit implicit ITs in Thumb
--asm-show-inst - Emit internal instruction
representation to assembly file
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
--atomic-counter-update-promoted - Do counter update using atomic fetch
add
for promoted counters only
--atomic-first-counter - Use atomic fetch add for first
counter in a function (usually the entry counter)
--bounds-checking-single-trap - Use one trap block per function
--cfg-hide-deoptimize-paths -
--cfg-hide-unreachable-paths -
--compress-debug-sections=<value> - Choose DWARF debug sections
compression:
=none - No compression
=zlib - Use zlib compression
=zlib-gnu
- Use zlib-gnu compression (deprecated)
--cost-kind=<value> - Target cost kind
=throughput
- Reciprocal throughput
=latency
- Instruction latency
=code-size
- Code size
=size-latency
- Code size and latency
--cvp-dont-add-nowrap-flags -
--debugify-level=<value> - Kind of debug info to add
=locations
- Locations only
=location+variables
- Locations and Variables
--debugify-quiet - Suppress verbose debugify output
--defsym=<string> - Defines a symbol to be an integer
constant
--disable-promote-alloca-to-lds - Disable promote alloca to LDS
--disable-promote-alloca-to-vector - Disable promote alloca to vector
--do-counter-promotion - Do counter register promotion
--dot-cfg-mssa=<file name for generated dot file> - file name for generated dot file
--dwarf-version=<int> - Dwarf version
--dwarf64 - Generate debugging info in the 64-bit
DWARF format
--emscripten-cxx-exceptions-allowed=<string> - The list of function names in which
Emscripten-style exception handling is enabled (see emscripten
EMSCRIPTEN_CATCHING_ALLOWED options)
--enable-cse-in-irtranslator - Should enable CSE in irtranslator
--enable-cse-in-legalizer - Should enable CSE in Legalizer
--enable-emscripten-cxx-exceptions - WebAssembly Emscripten-style
exception handling
--enable-emscripten-sjlj - WebAssembly Emscripten-style
setjmp/longjmp handling
--enable-gvn-hoist - Enable the GVN hoisting pass (default
= off)
--enable-gvn-memdep -
--enable-gvn-sink - Enable the GVN sinking pass (default
= off)
--enable-load-in-loop-pre -
--enable-load-pre -
--enable-loop-simplifycfg-term-folding -
--enable-name-compression - Enable name/filename string
compression
--enable-split-backedge-in-load-pre -
--fatal-warnings - Treat warnings as errors
--fdebug-compilation-dir=<string> - Specifies the debug info's
compilation dir
--fdebug-prefix-map=<= separated key-value pairs> - Map file source paths in debug info
--filetype=<value> - Choose an output file type:
=asm - Emit an assembly ('.s') file
=null - Don't emit anything (for timing purposes)
=obj - Emit a native object ('.o') file
-g - Generate dwarf debugging info for
assembly source files
--gpsize=<uint> - Global Pointer Addressing Size.
The default size is 8.
--hash-based-counter-split - Rename counter variable of a comdat
function based on cfg hash
--hot-cold-split - Enable hot-cold splitting pass
--import-all-index - Import all external functions in
index.
--incremental-linker-compatible - When used with filetype=obj, emit an
object file which can be used with an incremental linker
--instcombine-code-sinking - Enable code sinking
--instcombine-guard-widening-window=<uint> - How wide an instruction window to
bypass looking for another guard
--instcombine-max-iterations=<uint> - Limit the maximum number of
instruction combining iterations
--instcombine-max-num-phis=<uint> - Maximum number phis to handle in
intptr/ptrint folding
--instcombine-maxarray-size=<uint> - Maximum array size considered when
doing a combine
--instcombine-negator-enabled - Should we attempt to sink negations?
--instcombine-negator-max-depth=<uint> - What is the maximal lookup depth when
trying to check for viability of negation sinking.
--instcombine-unsafe-select-transform - Enable poison-unsafe select to and/or
transform
--instrprof-atomic-counter-update-all - Make all profile counter updates
atomic (for testing only)
--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
--iterative-counter-promotion - Allow counter promotion across the
whole loop nest.
--large-code-model - Create cfi directives that assume the
code might be more than 2gb away
--lto-embed-bitcode=<value> - Embed LLVM bitcode in object files
produced by LTO
=none - Do not embed
=optimized
- Embed after all optimization passes
=post-merge-pre-opt
- Embed post merge, but before optimizations
--lto-pass-remarks-filter=<regex> - Only record optimization remarks from
passes whose names match the given regular expression
--lto-pass-remarks-format=<format> - The format used for serializing
remarks (default: YAML)
--lto-pass-remarks-output=<filename> - Output filename for pass remarks
--main-file-name=<string> - Specifies the name we should consider
the input file
--masm-hexfloats - Enable MASM-style hex float
initializers (3F800000r)
--masm-integers - Enable binary and hex masm integers
(0b110 and 0ABCh)
--matrix-default-layout=<value> - Sets the default matrix layout
=column-major
- Use column-major layout
=row-major
- Use row-major layout
--mattr=<a1,+a2,-a3,...> - Target specific attributes
(-mattr=help for details)
--max-counter-promotions=<int> - Max number of allowed counter
promotions
--max-counter-promotions-per-loop=<uint> - Max number counter promotions per
loop to avoid increasing register pressure too much
--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
--mhvx - Enable Hexagon Vector eXtensions
--mhvx=<value> - Enable Hexagon Vector eXtensions
=v60 - Build for HVX v60
=v62 - Build for HVX v62
=v65 - Build for HVX v65
=v66 - Build for HVX v66
=v67 - Build for HVX v67
--mips-compact-branches=<value> - MIPS Specific: Compact branch policy.
=never
- Do not use compact branches if possible.
=optimal
- Use compact branches where appropriate (default).
=always
- Always use compact branches if possible.
--mips16-constant-islands - Enable mips16 constant islands.
--mips16-hard-float - Enable mips16 hard float.
--mir-strip-debugify-only - Should mir-strip-debug only strip
debug info from debugified modules by default
--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
--poison-checking-function-local - Check that returns are non-poison
(for testing)
--position-independent - Position independent
--preserve-comments - Preserve Comments in outputted
assembly
--print-imm-hex - Prefer hex format for immediate
values
--r600-ir-structurize - Use StructurizeCFG IR pass
--rdf-dump -
--rdf-limit=<uint> -
--relax-relocations - Emit R_X86_64_GOTPCRELX instead of
R_X86_64_GOTPCREL
--runtime-counter-relocation - Enable relocating counters at
runtime.
--safepoint-ir-verifier-print-only -
--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-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
--skip-ret-exit-block - Suppress counter promotion if exit
blocks contain ret.
--speculative-counter-promotion-max-exiting=<uint> - The max number of exiting blocks of a
loop to allow
speculative counter promotion
--speculative-counter-promotion-to-loop - When the option is false, if the
target block is in a loop, the promotion will be disallowed unless the promoted counter
update can be further/iteratively promoted into an acyclic region.
--split-dwarf-file=<filename> - DWO output filename
--summary-file=<string> - The summary file to use for function
importing.
--tail-predication=<value> - MVE tail-predication pass options
=disabled
- Don't tail-predicate loops
=enabled-no-reductions
- Enable tail-predication, but not for reduction loops
=enabled
- Enable tail-predication, including reduction loops
=force-enabled-no-reductions
- Enable tail-predication, but not for reduction loops, and force this which
might be unsafe
=force-enabled
- Enable tail-predication, including reduction loops, and force this which might
be unsafe
--thinlto-assume-merged - Assume the input has already
undergone ThinLTO function importing and the other pre-optimization pipeline
changes.
--threads=<int> -
--triple=<string> - Target triple to assemble for, see
-version for available targets
--verify-region-info - Verify region info (time consuming)
--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-align-branch=<string> - Specify types of branches to align
(plus separated list of types):
jcc indicates conditional jumps fused indicates fused conditional jumps jmp
indicates direct unconditional jumps call indicates direct and indirect calls
ret indicates rets indirect indicates indirect unconditional jumps
--x86-align-branch-boundary=<uint> - Control how the assembler should
align branches with NOP. If the boundary's size is not 0, it should be a power of 2
and no less than 32. Branches will be aligned to prevent from being across or
against the boundary of specified size. The default value 0 does not align
branches.
--x86-branches-within-32B-boundaries - Align selected instructions to
mitigate negative performance impact of Intel's micro code update for errata skx102.
May break assumptions about labels corresponding to particular instructions, and
should be used with caution.
--x86-pad-max-prefix-size=<uint> - Maximum number of prefixes to use for
padding
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
Polly Options: Configure the polly loop optimizer
--polly - Enable the polly optimizer (only at
-O3)
--polly-2nd-level-tiling - Enable a 2nd level loop of loop
tiling
--polly-ast-print-accesses - Print memory access functions
--polly-context=<isl parameter set> - Provide additional constraints on the
context parameters
--polly-dce-precise-steps=<int> - The number of precise steps between
two approximating iterations. (A value of -1 schedules another approximation stage
before the actual dead code elimination.
--polly-delicm-max-ops=<int> - Maximum number of isl operations to
invest for lifetime analysis; 0=no limit
--polly-detect-full-functions - Allow the detection of full functions
--polly-dump-after - Dump module after Polly
transformations into a file suffixed with "-after"
--polly-dump-after-file=<string> - Dump module after Polly
transformations to the given file
--polly-dump-before - Dump module before Polly
transformations into a file suffixed with "-before"
--polly-dump-before-file=<string> - Dump module before Polly
transformations to the given file
--polly-enable-simplify - Simplify SCoP after optimizations
--polly-ignore-func=<string> - Ignore functions that match a regex.
Multiple regexes can be comma separated. Scop detection will ignore all functions
that match ANY of the regexes provided.
--polly-isl-arg=<argument> - Option passed to ISL
--polly-on-isl-error-abort - Abort if an isl error is encountered
--polly-only-func=<string> - Only run on functions that match a
regex. Multiple regexes can be comma separated. Scop detection will run on all
functions that match ANY of the regexes provided.
--polly-only-region=<identifier> - Only run on certain regions (The
provided identifier must appear in the name of the region's entry block
--polly-only-scop-detection - Only run scop detection, but no other
optimizations
--polly-optimized-scops - Polly - Dump polyhedral description
of Scops optimized with the isl scheduling optimizer and the set of post-scheduling
transformations is applied on the schedule tree
--polly-parallel - Generate thread parallel code (isl
codegen only)
--polly-parallel-force - Force generation of thread parallel
code ignoring any cost model
--polly-pattern-matching-based-opts - Perform optimizations based on
pattern matching
--polly-process-unprofitable - Process scops that are unlikely to
benefit from Polly optimizations.
--polly-register-tiling - Enable register tiling
--polly-report - Print information about the
activities of Polly
--polly-show - Highlight the code regions that will
be optimized in a (CFG BBs and LLVM-IR instructions)
--polly-show-only - Highlight the code regions that will
be optimized in a (CFG only BBs)
--polly-stmt-granularity=<value> - Algorithm to use for splitting basic
blocks into multiple statements
=bb - One statement per basic block
=scalar-indep
- Scalar independence heuristic
=store - Store-level granularity
--polly-target=<value> - The hardware to target
=cpu - generate CPU code
--polly-tiling - Enable loop tiling
--polly-vectorizer=<value> - Select the vectorization strategy
=none - No Vectorization
=polly - Polly internal vectorizer
=stripmine
- Strip-mine outer loops for the loop-vectorizer to trigger