Inline asm SSE code, how to?

[Rodrigo Hernandez]

Hi, new to the list here :)

I read on the Manual that there is an "x" constraint for using xmm 
registers, however, there is
no example and I couldnt find any on the web, so I figured I could ask 
for one here.

Right now I want to turn this:

asm
(
      "movups %0,%%xmm0\n\t"
      "movups %1,%%xmm1\n\t"
      "addps %%xmm1,%%xmm0\n\t"
        "movups %%xmm0,%2\n\t"
        :
        : "m" (var1[0]), "m" (var2[0]),"m"(result[0])
        : "%xmm0", "%xmm1"
);

into this:

asm
(
        "addps %2,%1\n\t"
        "movups %1,%0\n\t"
        : "=x"(result[0])
        : "x" (var1[0]), "x" (var2[0])
);

but the second approach gives me an "impossible constraint in `asm'" 
error, the variables are float[4] 16bit aligned arrays, I wouldn't 
change the code if it wasnt because I am getting wierd, random results 
in runtime with the first piece of code.

Anyway, could someone give me an example on how to use the constraint?

Thank you very much :)