The flat assembler (abbreviated to fasm) is a fast self-assembling assembler for DOS, Windows and Linux operating systems. It was designed primarily for the assembly of x86 instructions and it supports x86 and x86-64 instructions sets with MMX, 3DNow!, SSE up to SSE4, AVX, AVX2, XOP and AVX-512 extensions and can produce output in plain binary, MZ, PE, COFF or ELF format. It includes the powerful but easy to use macroinstruction support and does multiple passes to optimize the size of instruction codes. The flat assembler is self-hosting and the complete source code is included.
Modifications
Added "invlpgb" and "tlbsync" instructions. Upper bits of default entry point of ELF64 executable were not correctly stored in the header.
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