// output of ./demo/arith/shiftadd-log-demo.cc:
// Description:
//% Shift-add algorithm for computing log_b(x).

arg 1: 1.41421 == x  [Argument for shift-add log_b(x) computation]  default=1.41421
arg 2: 2 == b  [Base of the logarithm]  default=2
arg 3: 16 == n  [Number of iterations]  default=16

 -1   0.00000000   0.00000000  +1.00000000  +1.00000000

  1   1.50000000   0.00000000  +1.00000000  +0.58496250
  2   1.25000000   0.00000000  +1.00000000  +0.32192809
  2   1.56250000   0.32192809  +1.25000000  +0.32192809
  3   1.40625000   0.32192809  +1.25000000  +0.16992500
  3   1.58203125   0.49185309  +1.40625000  +0.16992500
  4   1.49414062   0.49185309  +1.40625000  +0.08746284
  5   1.45019531   0.49185309  +1.40625000  +0.04439411
  6   1.42822265   0.49185309  +1.40625000  +0.02236781
  7   1.41723632   0.49185309  +1.40625000  +0.01122725
  8   1.41174316   0.49185309  +1.40625000  +0.00562454
  8   1.41725778   0.49747764  +1.41174316  +0.00562454
  9   1.41450047   0.49747764  +1.41174316  +0.00281501
 10   1.41312181   0.49747764  +1.41174316  +0.00140819
 10   1.41450182   0.49888583  +1.41312181  +0.00140819
 11   1.41381182   0.49888583  +1.41312181  +0.00070426
 11   1.41450215   0.49959010  +1.41381182  +0.00070426
 12   1.41415698   0.49959010  +1.41381182  +0.00035217
 12   1.41450224   0.49994228  +1.41415698  +0.00035217
 13   1.41432961   0.49994228  +1.41415698  +0.00017609
 14   1.41424330   0.49994228  +1.41415698  +0.00008805
 15   1.41420014   0.49994228  +1.41415698  +0.00004402
 15   1.41424330   0.49998631  +1.41420014  +0.00004402

 99   1.41421356   0.50000000  +1.41421356  +0.00000000

dl = -1.368670526391557729e-05
2**(-n) = 1.52587890625e-05

