Thread: _asm or __asm?

in MSVC, it allows you to define assembly blocks with either _asm or __asm (one underscore as opposed to two). i was wondering if there is any difference in these at all, and if so, what? the docs only provide information for the double underscore version.

inline assembly is compiler dependent, and most compilers have a few different ways of doing it, in order to support other compilers' ways of doing inline assembly.

there is no ANSI standard on inline ASM code.

the most common inline asm statements are:

asm
_asm
__asm

and i think GCC uses a function call that takes a string, but I have not been able to get it to work so far, so anyone who is able to get it to work, tell me:

asm ( char * );

and i think GCC uses a function call that takes a string, but I have not been able to get it to work so far, so anyone who is able to get it to work, tell me:

asm ( char * );

I was able to get inline asm to work in Dev-C++ (which uses gcc I believe), but it's really strange, and to use intel syntax you have to add -masm=intel to compiler commands...Which doesn't seem to work if I try to call gcc directly. But anyways here's something I got to compile with Dev-C++:

Code:

#include <iostream>
using namespace std;

int main(void)
{
static int x __asm__("x") = 5;
asm(
"mov eax, x;"
"shr eax,1;"
"mov x, eax;"
);

std::cout<<x;
}

Useless, yes, but my assembly skills suck and I couldn't think of anything better...

Originally posted by DISGUISED
EDIT: Brain was moving faster than fingers

Don't let it happen again