LLVM-MC(1) User Commands LLVM-MC(1)
NAME
llvm-mc - manual page for llvm-mc 9
DESCRIPTION
OVERVIEW: llvm machine code playground
USAGE: llvm-mc [options] <input file>
OPTIONS:
Color Options:
--color - Use colors in out-
put (default=autodetect)
General options:
-I=<directory> - Directory of in-
clude 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
--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 com-
biner
--amdgpu-dump-hsa-metadata - Dump AMDGPU HSA
Metadata
--amdgpu-enable-global-sgpr-addr - Enable use of SGPR
regs for GLOBAL LOAD/STORE instructions
--amdgpu-enable-merge-m0 - Merge and hoist M0
initializations
--amdgpu-sdwa-peephole - Enable SDWA peep-
holer
--amdgpu-spill-sgpr-to-smem - Use scalar stores
to spill SGPRs if supported by subtarget
--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 as-
semble 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 in-
struction representation to assembly file
--atomic-counter-update-promoted - Do counter update
using atomic fetch add
for promoted counters only
--bounds-checking-single-trap - Use one trap block
per function
--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
--cvp-dont-add-nowrap-flags -
--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
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 disassem-
bly of strings of hex bytes
--do-counter-promotion - Do counter regis-
ter promotion
--dwarf-version=<int> - Dwarf version
--emscripten-cxx-exceptions-whitelist=<string> - The list of func-
tion names in which Emscripten-style exception handling is en-
abled (see emscripten EMSCRIPTEN_CATCHING_WHITELIST options)
--enable-cse-in-irtranslator - Should enable CSE
in irtranslator
--enable-cse-in-legalizer - Should enable CSE
in Legalizer
--enable-emscripten-cxx-exceptions - WebAssembly Em-
scripten-style exception handling
--enable-emscripten-sjlj - WebAssembly Em-
scripten-style setjmp/longjmp handling
--enable-gvn-memdep -
--enable-load-pre -
--enable-loop-simplifycfg-term-folding -
--enable-name-compression - Enable name string
compression
--expensive-combines - Enable expensive
instruction combines
--fatal-warnings - Treat warnings as
errors
--fdebug-compilation-dir=<string> - Specifies the de-
bug 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 de-
bugging info for assembly source files
--gpsize=<uint> - Global Pointer Ad-
dressing Size.
The default size is 8.
--hash-based-counter-split - Rename counter
variable of a comdat function based on cfg hash
--import-all-index - Import all exter-
nal functions in index.
--incremental-linker-compatible - When used with
filetype=obj, emit an object file which can be used with an in-
cremental linker
--instcombine-code-sinking - Enable code sink-
ing
--instcombine-guard-widening-window=<uint> - How wide an in-
struction window to bypass looking for another guard
--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
--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 pro-
motion across the whole loop nest.
--large-code-model - Create cfi direc-
tives that assume the code might be more than 2gb away
--lto-pass-remarks-filter=<regex> - Only record opti-
mization 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-integers - Enable binary and
hex masm integers (0b110 and 0ABCh)
--mattr=<a1,+a2,-a3,...> - Target specific
attributes (-mattr=help for details)
--max-counter-promotions=<int> - Max number of al-
lowed 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)
--memop-size-large=<uint> - Set large value
thresthold in memory intrinsic size profiling. Value of 0 dis-
ables the large value profiling.
--memop-size-range=<string> - Set the range of
size in memory intrinsic calls to be profiled precisely, in a
format of <start_val>:<end_val>
--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
--mips-compact-branches=<value> - MIPS Specific:
Compact branch policy.
=never
- Do not use compact branches if possible.
=optimal
- Use compact branches where appropiate (default).
=always
- Always use compact branches if possible.
--mips16-constant-islands - Enable mips16 con-
stant 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 pre-
cision 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 mismatch-
ing a signed and unsigned value
-n - Don't assume as-
sembly file starts in the text section
--no-deprecated-warn - Suppress all dep-
recated warnings
--no-discriminators - Disable generation
of discriminator information.
--no-exec-stack - File doesn't need
an exec stack
--no-warn - Suppress all warn-
ings
--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 Reloca-
tions
--poison-checking-function-local - Check that returns
are non-poison (for testing)
--position-independent - Position indepen-
dent
--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_GOT-
PCRELX instead of R_X86_64_GOTPCREL
--remarks-section - Emit a section
containing remark diagnostics metadata
--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 tem-
porary labels
--show-encoding - Show instruction
encodings
--show-inst - Show internal in-
struction representation
--show-inst-operands - Show instructions
operands as parsed
--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 disal-
lowed unless the promoted counter
update can be further/iteratively promoted into an acyclic re-
gion.
--split-dwarf-file=<filename> - DWO output file-
name
--summary-file=<string> - The summary file
to use for function importing.
--threads=<int> -
--time-trace-granularity=<uint> - Minimum time gran-
ularity (in microseconds) traced by time profiler
--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
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 ver-
sion of this program
llvm-mc 9 October 2020 LLVM-MC(1)