[LLVMdev] Is NASM supported by LLVM?

[Thomson]

I saw some LLVM generated assembly in NASM format, but did find this support in the official release. Is this supported?

--
Thanks
Thomson Tan

[Sean Silva]

If by "NASM format" you mean Intel syntax, then yes. In my experience most LLVM tools refer to it with the option "-x86-asm-syntax=intel". For example, tools/llvm-objdump has this flag.

--Sean Silva

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[Thomson]

Could generated assembly with option "-x86-asm-symtab=intel" be assembled by nasm directly?

[Sean Silva]

My intuition is that it will almost, but not quite, work. However, I would suggest that you test it to find out though.

--Sean Silva

[Charles Davis]

On Jun 20, 2012, at 11:12 PM, Thomson wrote:

I saw some LLVM generated assembly in NASM format, but did find this support in the official release. Is this supported?

I have no idea where people get this silly notion that Intel syntax is the same as Netwide* syntax. They are NOT the same. They are similar, but not the same.

LLVM does not support the Netwide syntax. (There was talk of it, but nothing ever came of it--so far, at least) It does, however, support the Intel syntax... sort of. Specifically, it supports the GNU variant of it (where the actual instructions use Intel syntax, but pseudo-ops use GNU syntax--'.byte' instead of 'DB', for example).

* That's what the 'N' in "NASM' stands for.

Chip