NASM/YASM is easy to distinguish from MASM/TASM/emu8086. YASM uses NASM syntax, with a few minor differences in what it accepts for constants and directives. I don’t know how to distinguish MASM from TASM, or TASM from emu8086, or FASM, so I’ll leave that for another answer to address. In NASM, explicit sizes on things like … Read more
As of Binutils 2.29 the instruction suffixes are now deprecated in favor of pseudo-prefixes. You can find the older suffixes documented in the GNU Assembler (pre-2.29) info pages. Earlier info as pages say this: 9.15.4.1 Instruction Naming [snip] Different encoding options can be specified via optional mnemonic suffix. .s suffix swaps 2 register operands in … Read more
Compile with gcc -masm=intel and don’t try to switch modes inside the asm template string. AFAIK there’s no equivalent before clang14 (Note: MacOS installs clang as gcc / g++ by default.) Also, of course you need to use valid GNU C inline asm, using operands to tell the compiler which C objects you want to … Read more
Use -masm=intel and don’t use any .att_syntax directives in your inline asm. This works with GCC and I think ICC, and with any constraints you use. Other methods don’t. (See Can I use Intel syntax of x86 assembly with GCC? for a simple answer saying that; this answer explores exactly what goes wrong, including with … Read more