pasm-x86 is an assembler for x86-64 architecture.
Warning
i left pasm in rc phase, bc i'm too lazy to test and catch all the edge-cases (bc i'm not an assembly expert and i don't want to) and this tool is not production-ready despite its "impressive" (depends to who) results. use at your own risk.
-matyz 2026
- Wide coverage of x86-64 ISA (1795 unique mnemonics)
- Support for
SSE*,AVX,AVX2,AVX-512/AVX-10,Intel APX,x87,MMXand more x86-64 extensions - Support for bin and 32/64-bit ELF as export target
- Very performant and optimized (~3-4x faster than GAS in our cherry picked benchmarks 😊)
Just run: cargo build --release or cargo install --path .
Note
If you want to test if source code from any commit is valid to use:
# this requires that NASM binary is installed in $PATH
$ just test pasm's documentation can be found here.
It contains information on pasm's syntax as well as full x86-64 encoding notes.
pasm was brought to you by matissoss <matissossgamedev@proton.me> under MPL 2.0 license.