I see word NASM, MASM, Intel, AT&T. I am confused between them. Is it different types of assembly?

1 Answer 1


You are confusing several things.

nasm, masm and gas (GNU Assembler) are tools that compile an x86 assembly text file into an executable. Each of them do have a specific syntax to specify your program. But, they share a lot on assembly instructions.

Then, Intel and AT&T are specific syntax to write x86 assembly programs. In fact, nasm and masm use the Intel syntax, where gas is using the AT&T syntax.

  • gas has support for both, Intel syntax requires that you use the .intel_syntax directive. However, you'd be better off using a different assembler if you want to use Intel syntax.
    – Chase
    Nov 15, 2019 at 17:40

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