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Note that these tests are carefully designed to test performance of the underlying algorithms and not memory allocation or variable copying. As usual, performance results should be taken with a healthy dose of scepticism, and real-world performance may vary widely depending upon the specifics of the program. In each table relative times are given first, with the best performer given a score of 1. Total actual times are given in brackets, measured in seconds for 500000 operations.
Table 1.14. Operator +
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.0575156s) | 1 (0.0740086s) | 1 (0.219073s) | 
| gmp_float | 2.45065 (0.14095s) | 2.01398 (0.149052s) | 1.09608 (0.240122s) | 
| mpfr_float | 2.6001 (0.149546s) | 2.12079 (0.156957s) | 1.09078 (0.23896s) | 
Table 1.15. Operator +(int)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1.46115 (0.0855392s) | 2.60353 (0.114398s) | 3.62562 (0.264905s) | 
| gmp_float | 1 (0.0585424s) | 1 (0.0439398s) | 1 (0.0730648s) | 
| mpfr_float | 2.40441 (0.14076s) | 3.2877 (0.144461s) | 2.40379 (0.175632s) | 
Table 1.16. Operator +(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.118146s) | 1 (0.144714s) | 1 (0.315639s) | 
| gmp_float | 4.5555 (0.538213s) | 3.83096 (0.554395s) | 1.95079 (0.615745s) | 
| mpfr_float | 5.74477 (0.678719s) | 4.85295 (0.702291s) | 2.70354 (0.853342s) | 
Table 1.17. Operator +=(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.101188s) | 1 (0.122394s) | 1 (0.251975s) | 
| gmp_float | 5.199 (0.526079s) | 4.39327 (0.537712s) | 2.42151 (0.610159s) | 
| mpfr_float | 6.08318 (0.615547s) | 5.18525 (0.634645s) | 3.1022 (0.781677s) | 
Table 1.18. Operator -
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.0895163s) | 1 (0.129248s) | 1.5088 (0.374512s) | 
| gmp_float | 1.72566 (0.154474s) | 1.22567 (0.158415s) | 1 (0.248219s) | 
| mpfr_float | 1.83764 (0.164499s) | 1.34284 (0.173559s) | 1.00226 (0.248781s) | 
Table 1.19. Operator -(int)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.105285s) | 1 (0.142741s) | 1 (0.278718s) | 
| gmp_float | 2.34437 (0.246828s) | 1.28814 (0.183871s) | 1.00731 (0.280754s) | 
| mpfr_float | 2.8032 (0.295136s) | 2.09178 (0.298582s) | 1.25213 (0.34899s) | 
Table 1.20. Operator -(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.13719s) | 1 (0.184428s) | 1 (0.344212s) | 
| gmp_float | 4.0804 (0.559791s) | 3.06776 (0.565781s) | 2.07736 (0.715053s) | 
| mpfr_float | 5.10114 (0.699828s) | 3.88684 (0.716843s) | 2.50074 (0.860784s) | 
Table 1.21. Operator -=(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.100984s) | 1 (0.123148s) | 1 (0.246181s) | 
| gmp_float | 5.68353 (0.573944s) | 4.68636 (0.577116s) | 2.6958 (0.663655s) | 
| mpfr_float | 6.19738 (0.625834s) | 5.18544 (0.638577s) | 3.18738 (0.784673s) | 
Table 1.22. Operator *
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1.03667 (0.284251s) | 1.30576 (0.536527s) | 1.44686 (4.81057s) | 
| gmp_float | 1 (0.274196s) | 1 (0.410891s) | 1 (3.32484s) | 
| mpfr_float | 1.24537 (0.341477s) | 1.15785 (0.475749s) | 1.1796 (3.92199s) | 
Table 1.23. Operator *(int)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 3.97453 (0.240262s) | 9.91222 (0.463473s) | 50.7926 (4.36527s) | 
| gmp_float | 1 (0.0604505s) | 1 (0.0467577s) | 1 (0.0859431s) | 
| mpfr_float | 2.56974 (0.155342s) | 3.56312 (0.166603s) | 3.22964 (0.277565s) | 
Table 1.24. Operator *(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.331877s) | 1.01058 (0.586122s) | 6.688 (4.7931s) | 
| gmp_float | 1.72433 (0.572266s) | 1 (0.579987s) | 1 (0.716672s) | 
| mpfr_float | 2.5553 (0.848047s) | 1.74987 (1.0149s) | 1.80403 (1.2929s) | 
Table 1.25. Operator *=(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.321397s) | 1.00772 (0.574887s) | 6.65946 (4.7468s) | 
| gmp_float | 1.77419 (0.570218s) | 1 (0.570482s) | 1 (0.712791s) | 
| mpfr_float | 2.62172 (0.842611s) | 1.77691 (1.01369s) | 1.77511 (1.26528s) | 
Table 1.26. Operator /
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 2.96096 (4.00777s) | 4.53244 (7.86435s) | 6.11936 (51.5509s) | 
| gmp_float | 1 (1.35354s) | 1 (1.73512s) | 1 (8.42422s) | 
| mpfr_float | 1.30002 (1.75963s) | 1.39045 (2.41261s) | 1.66762 (14.0484s) | 
Table 1.27. Operator /(int)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 8.60726 (1.8181s) | 15.4122 (3.67479s) | 34.5119 (24.729s) | 
| gmp_float | 1.24394 (0.262756s) | 1 (0.238433s) | 1 (0.716536s) | 
| mpfr_float | 1 (0.211229s) | 1.12178 (0.26747s) | 1.02237 (0.732562s) | 
Table 1.28. Operator /(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 2.10976 (1.97569s) | 3.73601 (3.9133s) | 11.3085 (25.4533s) | 
| gmp_float | 1 (0.936452s) | 1 (1.04746s) | 1 (2.25081s) | 
| mpfr_float | 1.3423 (1.257s) | 1.51575 (1.58768s) | 3.31513 (7.46175s) | 
Table 1.29. Operator /=(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 2.17401 (1.96883s) | 3.79591 (3.8965s) | 11.2328 (25.2606s) | 
| gmp_float | 1 (0.905621s) | 1 (1.0265s) | 1 (2.24882s) | 
| mpfr_float | 1.37953 (1.24933s) | 1.53073 (1.57129s) | 3.30546 (7.43339s) | 
Table 1.30. Operator construct
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.00929804s) | 1 (0.0268321s) | 1 (0.0310685s) | 
| gmp_float | 30.8781 (0.287106s) | 7.59969 (0.203916s) | 6.51873 (0.202527s) | 
| mpfr_float | 23.5296 (0.218779s) | 8.11058 (0.217624s) | 7.16325 (0.222552s) | 
Table 1.31. Operator construct(unsigned)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.0603971s) | 1 (0.0735485s) | 1 (0.116464s) | 
| gmp_float | 3.91573 (0.236498s) | 2.88171 (0.211945s) | 1.81075 (0.210887s) | 
| mpfr_float | 4.90052 (0.295977s) | 4.01118 (0.295017s) | 2.62005 (0.305141s) | 
Table 1.32. Operator construct(unsigned long long)
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 1 (0.0610288s) | 1 (0.0759005s) | 1 (0.118511s) | 
| gmp_float | 8.26247 (0.504249s) | 6.69042 (0.507806s) | 4.32819 (0.51294s) | 
| mpfr_float | 10.1593 (0.620013s) | 8.45884 (0.64203s) | 5.51472 (0.653557s) | 
Table 1.33. Operator str
| Backend | 50 Bits | 100 Bits | 500 Bits | 
|---|---|---|---|
| cpp_dec_float | 2.95848 (0.0223061s) | 3.33461 (0.033471s) | 3.0159 (0.132732s) | 
| gmp_float | 1 (0.00753971s) | 1 (0.0100374s) | 1 (0.0440106s) | 
| mpfr_float | 1.25424 (0.00945658s) | 1.24943 (0.012541s) | 1.09428 (0.0481601s) | 
Test code was compiled with Microsoft Visual Studio 2010 with all optimisations turned on (/Ox), and used MPIR-2.3.0 and MPFR-3.0.0. The tests were run on 32-bit Windows Vista machine.