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