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Compiler Option: -asm

Documentation

Set assembler format for inline assembly under -gen gcc

Syntax



-asm < format >

Parameters

format

The assembler format: intel or att

Description

The -asm compiler option sets the assembler format for inline Asm blocks when using -gen gcc.

-gen gcc -asm intel: FB inline assembly blocks must use FB's usual Intel syntax format. Under -gen gcc, fbc will try to translate it to gcc's format automatically. For example:

Dim a As Long = 1

Print a

Asm

    inc dword Ptr [a]

End Asm

Print a

-gen gcc -asm att: FB inline assembly blocks must use gcc's format. For example:

Dim a As Long = 1

Print a

Asm

    "incl %0\n" : "+m" (a) : :

End Asm

Print a

The x86 ASM backend (-gen gas) currently only supports -asm intel and using -asm att results in an error.