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H. Peter Anvin (Intel) 7e82d9d1e3 Add a default-error warning for impossible o64, a64, or a16 prefixes 
The o64, a64 and a16 prefixes are only possible in specific
modes. It is a lot easier to debug with a more sensible error message.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
2025-10-09 19:24:07 -07:00
.github/workflows
Setup CI/CD pipeline
2025-10-04 10:51:08 -07:00
asm
Add a default-error warning for impossible o64, a64, or a16 prefixes
2025-10-09 19:24:07 -07:00
autoconf
autoconf: more autoconf library macro updates
2025-09-22 17:02:58 -07:00
common
treewide: replace verbose copyright headers with SPDX tags
2025-10-01 11:45:31 -07:00
config
treewide: replace verbose copyright headers with SPDX tags
2025-10-01 11:45:31 -07:00
contrib
contrib/MSVC6.txt: Add guide how to use nasm in MSVC6
2010-01-24 23:17:55 +03:00
disasm
Fix compilation with Open Watcom
2025-10-09 14:52:29 -07:00
doc
Add a default-error warning for impossible o64, a64, or a16 prefixes
2025-10-09 19:24:07 -07:00
editors
Sync builtin.mac
2025-10-07 18:06:34 -07:00
headers
Fix more license headers
2025-10-01 12:05:34 -07:00
include
labels: make the prefix/suffix options and pragmas consistent
2025-10-07 18:46:39 -07:00
macros
Disable other warnings in endstruc
2025-10-03 10:30:33 -07:00
misc
Move editor help files to editors/, add NASM version number
2025-10-02 13:49:43 -07:00
Mkfiles
openwcom.mak: use internal commands if possible
2025-10-09 15:05:29 -07:00
nasmlib
nasmlib: rename crc32.c to crc32b.c to avoid conflict with zlib/crc32.c
2025-10-09 14:49:22 -07:00
nsis
nsis: remove references to RDOFF tools
2022-11-08 18:22:25 -08:00
output
output: fix null pointer dereferences in output/outaout.c
2025-10-06 14:58:40 -07:00
perllib
Fix some typos
2022-01-09 17:34:35 +01:00
stdlib
treewide: replace verbose copyright headers with SPDX tags
2025-10-01 11:45:31 -07:00
test
AMX-TRANSPOSE: removed, retag instructions NEVER.
2025-10-09 14:44:24 -07:00
tools
x86: tools: Remove unused perl code variables
2025-10-06 19:17:51 +02:00
travis
AMX-TRANSPOSE: removed, retag instructions NEVER.
2025-10-09 14:44:24 -07:00
win
windows host: add embedded manifest file
2024-01-29 17:19:32 -08:00
x86
insns.pl: register 0 should add RN_ZERO, not RM_ZERO
2025-10-09 15:42:29 -07:00
zlib
zlib: yet one more portability hack
2025-09-05 20:08:18 -07:00
.editorconfig
.editorconfig: hard tabs are still 8 spaces
2024-06-10 21:12:52 -07:00
.gitattributes
gitattributes: don't try to merge the version file
2020-06-30 13:48:13 -07:00
.gitignore
reconstruct ffmpegtest to be generic to support more different projects
2025-10-07 08:11:33 -07:00
.travis.yml
travis: Disable osx for a while
2018-10-17 21:40:14 +03:00
AUTHORS
Correct name spelling and email address
2015-01-18 20:21:14 +02:00
autogen.sh
autogen.sh: Use $PATH_SEPARATOR as a path separator of ACLOCAL_PATH
2025-10-03 10:29:57 -07:00
ChangeLog
Fix some typos
2022-01-09 17:34:35 +01:00
CHANGES
Move the revision history into the documentation
2008-07-14 02:45:57 -04:00
configure.ac
travis improvements: look for python3, log output, option to filter
2025-10-08 12:56:00 -07:00
INSTALL
Fix some typos
2022-01-09 17:34:35 +01:00
LICENSE
treewide: replace verbose copyright headers with SPDX tags
2025-10-01 11:45:31 -07:00
Makefile.in
nasmlib: rename crc32.c to crc32b.c to avoid conflict with zlib/crc32.c
2025-10-09 14:49:22 -07:00
nasm.spec.in
nasm.spec.in: change http:// to https://
2025-10-09 17:19:54 -07:00
nasm.spec.sed
nasm.spec: use a sed file to insert perl dependencies
2017-04-23 18:54:23 -07:00
nasm.txt
Fix some typos
2022-01-09 17:34:35 +01:00
ndisasm.txt
ndisasm: man -- Add missing -p option
2013-04-20 20:18:46 +04:00
README.md
doc: remove references to sourceforge
2020-07-01 21:48:44 -07:00
SubmittingPatches
SubmittingPatches: Update git link
2025-10-06 14:22:50 -07:00
version
NASM 3.01rc8
2025-10-09 16:15:52 -07:00
version.pl
Move editor help files to editors/, add NASM version number
2025-10-02 13:49:43 -07:00

README.md

NASM, the Netwide Assembler

master

Many many developers all over the net respect NASM for what it is: a widespread (thus netwide), portable (thus netwide!), very flexible and mature assembler tool with support for many output formats (thus netwide!!).

Now we have good news for you: NASM is licensed under the "simplified" (2-clause) BSD license. This means its development is open to even wider society of programmers wishing to improve their lovely assembler.

Visit our nasm.us website for more details.

With best regards, the NASM crew.

Description
A cross-platform x86 assembler with an Intel-like syntax.
https://www.nasm.us/
Readme BSD-2-Clause 14 MiB
Languages
Assembly 57%
C 36.9%
Perl 3.1%
Makefile 0.8%
M4 0.7%
Other 1.5%