Calculate exp x from series expansion

    exp x = 1 + x/1! + x²/2! + x³/3! ...

    Note that while the numerator is fixed point, the factorial
    in the denominator is not.  This allows a larger valid range
    before overflow occurs.

    V0      x (Input), exp x (Output)
    V1      num
    V2      sum
    V3      denom
    V4      count
    V5      scratch
    V6      1

    V9      0
    V11     100000
    V12     50000

A set decimal places to +10

N002    1.0
N003    1
N004    2
N006    1

N009    0
N011 10000000000
N012 5000000000

    Scale to use 10 more digits for computation

×
L000
L011
S000
S001

(?

    sum = sum + num / denom

/
L001
L003
S005'

+
L002
L005
S002

    num = num * x

*
L001
L000
>
S001

    denom = denom * count

L003
L004
S003

    count = count + 1

+
L004
L006
S004

    Cycle if term nonzero

-
L009
L005
)

    Add rounding constant

+
L002
L012
S000

    Scale to result

÷
L000
L011
S000'

A set decimal places to -10