decimal128 performance

These measurements are on decNumber/decFloats version 3.56 and IDFPL version 1.0, measured 2007.10.11 and 2007.10.19 respectively.

128-bit conversions   Operation decQuad idfpl128   decNum   Encoding to BCD (with exponent)   34-digit finite   53       n/s       460       BCD to encoding (with exponent)   34-digit finite   74       n/s       307       Encoding to string   34-digit, with exponent   183       629       239       Exact string to encoding (unrounded)   34-digit, with exponent   297       1331       597       String to encoding (rounded)   34-digit, rounded, with exponent   451       1680       956       Narrow to decimal64   34-digit, all nines   140       546       612       int32 to encoding   From most negative int   44       18       199       Encoded integer to int32   To most negative int32   32       87       156       Encoding (any value) to int32   34-digit, all-nines round, to uint32   241       435       n/s

128-bit miscellaneous operations   Operation decQuad idfpl128   decNum   Class (classify number)   Negative small subnormal   53       355       133       Copies (Abs/Negate/Sign)   CopySign, copy needed   27       33       380       Count significant digits   Single digit   27       n/s       138       Logical And/Or/Xor/Invert (digitwise)   34-digit   27       n/s       622       Shift/Rotate   Rotate 33 digits   222       n/s       812

128-bit computations   Operation decQuad idfpl128   decNum   Add (same-sign addition)   34-digit, aligned   433       672       1180       Subtract (different-signs addition)   34-digit, unaligned, rounded, borrow   457       689       Compare   34-digit, unaligned, mismatch at end   187       320       1125       CompareTotal   34-digit, unaligned, mismatch at end   238       293       778       Divide   34- by 34-digit (rounded)   2018       1961       3172       FMA (fused multiply-add)   34-digit, subtraction, rounded   1622       3903       2707       LogB   Negative result   58       138       299       MaxNum/MinNum   34-digit, unaligned, mismatch at end   241       312       857       Multiply   34×34-digit, round needed   821       2444       2235       Quantize   34-digit, round all-nines   209       581       670       ScaleB   Underflow   263       495       553       To integral value   34-digit, round all-nines   233       461       886