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 :)
