hi all,
how can i realize EXP basic function using floating instructions ?
Just another question... to do Y^X ?
THX
first you need to express x^y as 2^(y * log2(x)), since fpu can only calc 2^val.
Then you must seperate 2^val into integer and fractional exponent: 2^int * 2^fraction.
Now you can use fscale and f2xm1.
fld dword ptr dvY
fld dword ptr dvX
fyl2x
fld st(0)
frndint
fsub st(1), st(0)
fxch st(1)
f2xm1
fld1
faddp st(1), st(0)
fscale
fstp dword ptr