Someone

;e^x = 2^(x * log2(e))
fld1              ;we is calculating e^1
fldl2e            ;log2(e)
fsub st1          ;frac(x * log2(e)) 
f2xm1             ;2^(fract(x * log2(e))) - 1
fld1              ;push 1.0
faddp st1,st0     ;add st1 and st0 and pop
fscale            ;scale st0 by st1
fstp st1          ;copy st0 to st1 and pop