float compare xmm

[dusty]

How can I compare two floats, xmm0 and xmm1 without using fpu and return answer i rax
int compf( double x, double y) "c++ calling function.  x64
x < y,  x > y ??

[qWord]

use COMISS for REAL4 (=float) or COMISD for REAL8 (=double). These instruction sets the eFlags:

Code Select Expand

xor eax,eax ; clear rax
movss xmm0,value1
movss xmm1,value2
comiss xmm0,xmm1
ja @foo  ; jump if value1 > value2
jb @foo  ; jump if value1 < value2
je ...
jae ...

seta al ; set AL if value1 > value2
...


[dusty]

qword;
thanks that did the trick
your'e to goodest