format

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.