as --version (return code: 0)
GNU assembler (GNU Binutils for Ubuntu) 2.26.1
Copyright (C) 2015 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-linux-gnu'.
as --help (return code: 0)
Usage: as [option...] [asmfile...]
Options:
-a[sub-option...] turn on listings
Sub-options [default hls]:
c omit false conditionals
d omit debugging directives
g include general info
h include high-level source
l include assembly
m include macro expansions
n omit forms processing
s include symbols
=FILE list to FILE (must be last sub-option)
--alternate initially turn on alternate macro syntax
--compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]
compress DWARF debug sections using zlib
--nocompress-debug-sections
don't compress DWARF debug sections [default]
-D produce assembler debugging messages
--debug-prefix-map OLD=NEW
map OLD to NEW in debug information
--defsym SYM=VAL define symbol SYM to given value
--execstack require executable stack for this object
--noexecstack don't require executable stack for this object
--size-check=[error|warning]
ELF .size directive check (default --size-check=error)
--sectname-subst enable section name substitution sequences
-f skip whitespace and comment preprocessing
-g --gen-debug generate debugging information
--gstabs generate STABS debugging information
--gstabs+ generate STABS debug info with GNU extensions
--gdwarf-2 generate DWARF2 debugging information
--gdwarf-sections generate per-function section names for DWARF line information
--hash-size=<value> set the hash table size close to <value>
--help show this message and exit
--target-help show target specific options
-I DIR add DIR to search list for .include directives
-J don't warn about signed overflow
-K warn when differences altered for long displacements
-L,--keep-locals keep local symbols (e.g. starting with `L')
-M,--mri assemble in MRI compatibility mode
--MD FILE write dependency information in FILE (default none)
-nocpp ignored
-o OBJFILE name the object-file output OBJFILE (default a.out)
-R fold data section into text section
--reduce-memory-overheads
prefer smaller memory use at the cost of longer
assembly times
--statistics print various measured statistics from execution
--strip-local-absolute strip local absolute symbols
--traditional-format Use same format as native assembler when possible
--version print assembler version number and exit
-W --no-warn suppress warnings
--warn don't suppress warnings
--fatal-warnings treat warnings as errors
-w ignored
-X ignored
-Z generate object file even after errors
--listing-lhs-width set the width in words of the output data column of
the listing
--listing-lhs-width2 set the width in words of the continuation lines
of the output data column; ignored if smaller than
the width of the first line
--listing-rhs-width set the max width in characters of the lines from
the source file
--listing-cont-lines set the maximum number of continuation lines used
for the output data column of the listing
@FILE read options from FILE
-Q ignored
-V print assembler version number
-k ignored
-n Do not optimize code alignment
-q quieten some warnings
-s ignored
--32/--64/--x32 generate 32bit/64bit/x32 code
--divide ignored
-march=CPU[,+EXTENSION...]
generate code for CPU and EXTENSION, CPU is one of:
generic32, generic64, i386, i486, i586, i686,
pentium, pentiumpro, pentiumii, pentiumiii, pentium4,
prescott, nocona, core, core2, corei7, l1om, k1om,
iamcu, k6, k6_2, athlon, opteron, k8, amdfam10,
bdver1, bdver2, bdver3, bdver4, znver1, btver1,
btver2
EXTENSION is combination of:
8087, 287, 387, no87, mmx, nommx, sse, sse2, sse3,
ssse3, sse4.1, sse4.2, sse4, nosse, avx, avx2,
avx512f, avx512cd, avx512er, avx512pf, avx512dq,
avx512bw, avx512vl, noavx, vmx, vmfunc, smx, xsave,
xsaveopt, xsavec, xsaves, aes, pclmul, fsgsbase,
rdrnd, f16c, bmi2, fma, fma4, xop, lwp, movbe, cx16,
ept, lzcnt, hle, rtm, invpcid, clflush, nop, syscall,
rdtscp, 3dnow, 3dnowa, padlock, svme, sse4a, abm,
bmi, tbm, adx, rdseed, prfchw, smap, mpx, sha,
clflushopt, prefetchwt1, se1, clwb, pcommit,
avx512ifma, avx512vbmi, clzero, mwaitx, ospke
-mtune=CPU optimize for CPU, CPU is one of:
generic32, generic64, i8086, i186, i286, i386, i486,
i586, i686, pentium, pentiumpro, pentiumii,
pentiumiii, pentium4, prescott, nocona, core, core2,
corei7, l1om, k1om, iamcu, k6, k6_2, athlon, opteron,
k8, amdfam10, bdver1, bdver2, bdver3, bdver4, znver1,
btver1, btver2
-msse2avx encode SSE instructions with VEX prefix
-msse-check=[none|error|warning]
check SSE instructions
-moperand-check=[none|error|warning]
check operand combinations for validity
-mavxscalar=[128|256] encode scalar AVX instructions with specific vector
length
-mevexlig=[128|256|512] encode scalar EVEX instructions with specific vector
length
-mevexwig=[0|1] encode EVEX instructions with specific EVEX.W value
for EVEX.W bit ignored instructions
-mevexrcig=[rne|rd|ru|rz]
encode EVEX instructions with specific EVEX.RC value
for SAE-only ignored instructions
-mmnemonic=[att|intel] use AT&T/Intel mnemonic
-msyntax=[att|intel] use AT&T/Intel syntax
-mindex-reg support pseudo index registers
-mnaked-reg don't require `%' prefix for registers
-mold-gcc support old (<= 2.8.1) versions of gcc
-madd-bnd-prefix add BND prefix for all valid branches
-mshared disable branch optimization for shared code
-momit-lock-prefix=[no|yes]
strip all lock prefixes
-mrelax-relocations=[no|yes]
generate relax relocations
-mamd64 accept only AMD64 ISA
-mintel64 accept only Intel64 ISA
Report bugs to <http://www.sourceware.org/bugzilla/>
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