GCC inline assembly error: no such instruction: `stosd'

Question

Oh man, I've got yet another error while compiling the following inline assembly code (with -fasm-blocks ) under GCC :

_asm
{
    mov ecx, esi
    shr ecx, 2
    rep stosd
};

GCC understands other stos instructions, why won't it accept stosd ???

Answer 1

seeing as your using intel syntax, just go for the explicit version of the STOS command: REP STOS DWORD PTR:[EDI] .

and iirc under gcc, stosd is called stosl .

Answer 2

Another way to fix this is to tell gcc to use intel assembly syntax with "-masm=intel".