Name: EXP2.ASM
         Type: Assembler Macro
      Version: 1.0
  Last Change: 26-Jan-87
                                                                   
 This macro will take the exponential of a number base 2.

      2**(x) = .1713425 x*x + .6674432 x + .9979554

 This polynomial will give approximately 8 significant bits of accuracy.
 This is valid for -1<= x <=0.

 The input value is put into x0, the output value is returned in register
 A.  Register R1 initially points to the coefficients in y memory in the
 order:a1,a2,a0.

       R1
       |
       v
 y:.6674432,.1713425,.9979554
       a1       a2       a0

 Benchmarks for this macro is 4 cycles, 4 instructions.
 The library program EXP2T demonstrates how to use the EXP2 macro.