...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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 1.34. Operator +
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.23704 (0.0274266s) |
1.09358 (0.0383278s) |
1.26645 (0.0558828s) |
1.32188 (0.0916899s) |
cpp_int(fixed) |
1.62044 (0.0359271s) |
1.5277 (0.053543s) |
1.73059 (0.076363s) |
1.71537 (0.118983s) |
gmp_int |
1.87515 (0.0415741s) |
1.21699 (0.042653s) |
1.15599 (0.0510088s) |
1 (0.0693631s) |
tommath_int |
1 (0.0221711s) |
1 (0.035048s) |
1 (0.0441255s) |
1.04441 (0.0724435s) |
Table 1.35. Operator +(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0155377s) |
1 (0.0209523s) |
1 (0.0306377s) |
1 (0.043125s) |
cpp_int(fixed) |
1.31904 (0.0204948s) |
1.76211 (0.0369203s) |
1.52941 (0.0468577s) |
1.60412 (0.0691778s) |
gmp_int |
1.96204 (0.0304855s) |
2.02569 (0.0424428s) |
2.11505 (0.0648002s) |
2.65993 (0.114709s) |
tommath_int |
14.0654 (0.218543s) |
10.8239 (0.226786s) |
7.76691 (0.23796s) |
6.10039 (0.263079s) |
Table 1.36. Operator +(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.026624s) |
1 (0.0291407s) |
1 (0.0373209s) |
1 (0.0464919s) |
cpp_int(fixed) |
1.31378 (0.034978s) |
1.54897 (0.045138s) |
1.53649 (0.0573431s) |
1.27833 (0.0594319s) |
gmp_int |
25.5775 (0.680974s) |
24.0117 (0.699717s) |
19.5633 (0.730121s) |
16.8939 (0.785432s) |
tommath_int |
19.4694 (0.518354s) |
18.4246 (0.536907s) |
14.7715 (0.551288s) |
12.3637 (0.574812s) |
Table 1.37. Operator +=(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.18405 (0.0196905s) |
1.22304 (0.0206476s) |
1.25861 (0.0217397s) |
1.29525 (0.0220829s) |
cpp_int(fixed) |
1 (0.0166298s) |
1 (0.0168822s) |
1 (0.0172728s) |
1 (0.0170492s) |
gmp_int |
39.9082 (0.663668s) |
39.4584 (0.666147s) |
38.5504 (0.665873s) |
39.2231 (0.668722s) |
tommath_int |
30.6219 (0.509238s) |
30.4135 (0.513447s) |
30.9077 (0.533863s) |
32.3086 (0.550835s) |
Table 1.38. Operator -
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.06986 (0.0296064s) |
1 (0.0381508s) |
1.05932 (0.053186s) |
1.1766 (0.0844721s) |
cpp_int(fixed) |
1.3304 (0.0368163s) |
1.44506 (0.0551303s) |
1.4431 (0.0724545s) |
1.57255 (0.112898s) |
gmp_int |
1.48072 (0.0409761s) |
1.19003 (0.0454007s) |
1.0794 (0.0541942s) |
1 (0.0717934s) |
tommath_int |
1 (0.0276731s) |
1.10891 (0.0423057s) |
1 (0.0502076s) |
1.08479 (0.0778811s) |
Table 1.39. Operator -(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0147372s) |
1 (0.0170001s) |
1 (0.0232882s) |
1 (0.0310734s) |
cpp_int(fixed) |
1.4267 (0.0210256s) |
1.98887 (0.0338109s) |
1.83788 (0.0428009s) |
1.81269 (0.0563264s) |
gmp_int |
2.07504 (0.0305803s) |
2.40928 (0.0409579s) |
2.58711 (0.0602493s) |
3.26438 (0.101435s) |
tommath_int |
13.5424 (0.199577s) |
12.1793 (0.207048s) |
9.28855 (0.216314s) |
7.49327 (0.232842s) |
Table 1.40. Operator -(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0277377s) |
1 (0.0296807s) |
1 (0.0372392s) |
1 (0.0455855s) |
cpp_int(fixed) |
1.19867 (0.0332484s) |
1.48639 (0.0441169s) |
1.43253 (0.0533464s) |
1.27697 (0.0582111s) |
gmp_int |
24.1794 (0.670683s) |
22.9073 (0.679904s) |
18.8758 (0.702922s) |
16.5837 (0.755975s) |
tommath_int |
18.149 (0.503413s) |
17.4116 (0.516787s) |
14.0411 (0.52288s) |
11.8237 (0.538987s) |
Table 1.41. Operator -=(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.26896 (0.0203467s) |
1.25722 (0.0206147s) |
1.36108 (0.0225485s) |
1.18351 (0.0226161s) |
cpp_int(fixed) |
1 (0.0160342s) |
1 (0.0163971s) |
1 (0.0165667s) |
1 (0.0191094s) |
gmp_int |
41.1339 (0.659547s) |
40.3982 (0.662411s) |
39.925 (0.661425s) |
34.636 (0.661874s) |
tommath_int |
31.1543 (0.499533s) |
31.0303 (0.508806s) |
30.7699 (0.509756s) |
27.7054 (0.529434s) |
Table 1.42. Operator *
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.11839 (0.0757577s) |
1.61061 (0.207951s) |
1.4501 (0.696912s) |
1.72796 (2.64108s) |
cpp_int(fixed) |
1.01115 (0.0684934s) |
1.28687 (0.166152s) |
1 (0.480595s) |
1 (1.52844s) |
gmp_int |
1 (0.0677384s) |
1 (0.129113s) |
1.09011 (0.523902s) |
1.03374 (1.58s) |
tommath_int |
1.6322 (0.110562s) |
2.71751 (0.350866s) |
2.05222 (0.986288s) |
2.0644 (3.15531s) |
Table 1.43. Operator *(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.01611 (0.0229536s) |
1.12175 (0.0298152s) |
1.16413 (0.0416439s) |
1.31747 (0.0666043s) |
cpp_int(fixed) |
1.30215 (0.0294152s) |
1.669 (0.0443606s) |
1.72395 (0.0616701s) |
1.88315 (0.095202s) |
gmp_int |
1 (0.0225897s) |
1 (0.0265791s) |
1 (0.0357725s) |
1 (0.0505547s) |
tommath_int |
10.8281 (0.244603s) |
10.1516 (0.26982s) |
8.76424 (0.313519s) |
8.04364 (0.406644s) |
Table 1.44. Operator *(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0570721s) |
1 (0.0856141s) |
1 (0.143279s) |
1 (0.252785s) |
cpp_int(fixed) |
1.10857 (0.0632686s) |
1.2951 (0.110878s) |
1.20827 (0.173121s) |
1.18463 (0.299456s) |
gmp_int |
12.0605 (0.68832s) |
8.13434 (0.696415s) |
5.21762 (0.747577s) |
3.11601 (0.787681s) |
tommath_int |
10.0524 (0.57371s) |
7.33116 (0.627651s) |
4.85202 (0.695193s) |
3.35808 (0.848871s) |
Table 1.45. Operator *=(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
111.27 (7.43118s) |
67.7078 (7.34138s) |
43.3851 (7.4075s) |
25.3089 (7.55455s) |
cpp_int(fixed) |
1 (0.0667848s) |
1 (0.108427s) |
1 (0.170738s) |
1 (0.298493s) |
gmp_int |
46.3718 (3.09693s) |
28.4639 (3.08626s) |
18.1719 (3.10264s) |
10.5223 (3.14083s) |
tommath_int |
276.674 (18.4776s) |
169.146 (18.34s) |
108.491 (18.5236s) |
63.3261 (18.9024s) |
Table 1.46. Operator /
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
2.68035 (0.595251s) |
2.04702 (0.707471s) |
1.62314 (0.921536s) |
1.43112 (1.38811s) |
cpp_int(fixed) |
1 (0.222079s) |
1 (0.34561s) |
1 (0.567748s) |
1 (0.969945s) |
gmp_int |
3.79283 (0.842308s) |
2.73668 (0.945824s) |
1.86649 (1.05969s) |
1.32141 (1.2817s) |
tommath_int |
13.2531 (2.94324s) |
11.2054 (3.87271s) |
9.83293 (5.58262s) |
13.0164 (12.6252s) |
Table 1.47. Operator /(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
4.06026 (0.225473s) |
3.45732 (0.340049s) |
3.00195 (0.547957s) |
2.80587 (0.978029s) |
cpp_int(fixed) |
2.43766 (0.135367s) |
2.56264 (0.252052s) |
2.44011 (0.445402s) |
2.38009 (0.829617s) |
gmp_int |
1 (0.0555316s) |
1 (0.0983563s) |
1 (0.182534s) |
1 (0.348566s) |
tommath_int |
35.9988 (1.99907s) |
27.1024 (2.66569s) |
21.8333 (3.98531s) |
25.8066 (8.99528s) |
Table 1.48. Operator /(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.50505 (0.705756s) |
1.39347 (1.58556s) |
2.63348 (3.57438s) |
4.75451 (8.52733s) |
cpp_int(fixed) |
1 (0.468925s) |
1.12378 (1.27869s) |
2.29966 (3.12128s) |
4.4844 (8.04288s) |
gmp_int |
2.17234 (1.01866s) |
1 (1.13785s) |
1 (1.35728s) |
1 (1.79352s) |
tommath_int |
4.74612 (2.22557s) |
2.70088 (3.07319s) |
3.65634 (4.96268s) |
6.79408 (12.1853s) |
Table 1.49. Operator /=(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.76281 (0.0574966s) |
1.76471 (0.0604224s) |
1.56085 (0.0716403s) |
1.31422 (0.124043s) |
cpp_int(fixed) |
1 (0.0326164s) |
1 (0.0342393s) |
1 (0.0458981s) |
1 (0.0943852s) |
gmp_int |
20.2862 (0.661664s) |
19.4043 (0.664389s) |
14.4881 (0.664976s) |
7.14238 (0.674135s) |
tommath_int |
32.9555 (1.07489s) |
30.1525 (1.0324s) |
22.8324 (1.04796s) |
11.7456 (1.10861s) |
Table 1.50. Operator %
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.8501 (0.364131s) |
1.46527 (0.476653s) |
1.27509 (0.689738s) |
1.20064 (1.11769s) |
cpp_int(fixed) |
1 (0.196817s) |
1 (0.325301s) |
1 (0.540932s) |
1 (0.930916s) |
gmp_int |
3.2533 (0.640305s) |
2.15441 (0.700832s) |
1.47898 (0.800029s) |
1.07439 (1.00016s) |
tommath_int |
15.3501 (3.02116s) |
12.1106 (3.9396s) |
11.0689 (5.98752s) |
13.5535 (12.6172s) |
Table 1.51. Operator %(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.82761 (0.104331s) |
2.01496 (0.202512s) |
2.10004 (0.389523s) |
2.17252 (0.768097s) |
cpp_int(fixed) |
1.78851 (0.102099s) |
1.96844 (0.197838s) |
2.02956 (0.376451s) |
2.07257 (0.73276s) |
gmp_int |
1 (0.057086s) |
1 (0.100505s) |
1 (0.185483s) |
1 (0.353552s) |
tommath_int |
36.3018 (2.07233s) |
26.3075 (2.64402s) |
21.9525 (4.07183s) |
25.6759 (9.07775s) |
Table 1.52. Operator construct
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.40211 (0.0026854s) |
1 (0.00278639s) |
1 (0.00322813s) |
1 (0.0027185s) |
cpp_int(fixed) |
1 (0.00191526s) |
1.40721 (0.00392103s) |
1.90346 (0.00614463s) |
2.14621 (0.00583447s) |
gmp_int |
98.705 (0.189046s) |
68.9726 (0.192184s) |
58.8994 (0.190135s) |
70.0525 (0.190438s) |
tommath_int |
105.602 (0.202255s) |
74.1994 (0.206748s) |
63.6455 (0.205456s) |
76.8935 (0.209035s) |
Table 1.53. Operator construct(unsigned)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.73436 (0.00348927s) |
1 (0.00263476s) |
1 (0.0027009s) |
1 (0.00318651s) |
cpp_int(fixed) |
1 (0.00201185s) |
1.36851 (0.0036057s) |
2.07362 (0.00560064s) |
1.66856 (0.00531688s) |
gmp_int |
97.2414 (0.195635s) |
76.3759 (0.201232s) |
72.7396 (0.196462s) |
63.8129 (0.20334s) |
tommath_int |
210.112 (0.422713s) |
162.652 (0.42855s) |
158.33 (0.427634s) |
134.626 (0.428987s) |
Table 1.54. Operator construct(unsigned long long)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
2.34403 (0.00739542s) |
1.66376 (0.00713834s) |
1.22989 (0.0074969s) |
1.23708 (0.00711417s) |
cpp_int(fixed) |
1 (0.00315501s) |
1 (0.00429049s) |
1 (0.00609561s) |
1 (0.0057508s) |
gmp_int |
222.866 (0.703144s) |
164.331 (0.705059s) |
115.363 (0.70321s) |
122.347 (0.703596s) |
tommath_int |
218.681 (0.689941s) |
163.796 (0.702765s) |
114.57 (0.698376s) |
122.422 (0.704027s) |
Table 1.55. Operator gcd
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.16358 (2.74442s) |
1.39847 (8.11559s) |
1.64677 (22.2518s) |
1.95096 (64.4961s) |
cpp_int(fixed) |
1 (2.35859s) |
1.30986 (7.60133s) |
1.67681 (22.6577s) |
2.0895 (69.0758s) |
gmp_int |
1.03392 (2.4386s) |
1 (5.80319s) |
1 (13.5124s) |
1 (33.0586s) |
tommath_int |
5.25978 (12.4057s) |
4.4619 (25.8932s) |
4.15577 (56.1542s) |
3.91192 (129.323s) |
Table 1.56. Operator powm
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
2.50722 (2.91621s) |
3.5561 (13.406s) |
4.37066 (73.483s) |
4.88831 (473.91s) |
cpp_int(fixed) |
1.93385 (2.24931s) |
3.18107 (11.9922s) |
4.20753 (70.7403s) |
4.8158 (466.88s) |
gmp_int |
1 (1.16313s) |
1 (3.76986s) |
1 (16.8128s) |
1 (96.9476s) |
tommath_int |
1.44081 (1.67584s) |
1.8794 (7.08507s) |
2.19115 (36.8394s) |
2.17186 (210.557s) |
Table 1.57. Operator str
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.17175 (0.00160006s) |
1.41999 (0.00329476s) |
1.40856 (0.00813784s) |
1.52964 (0.0229767s) |
cpp_int(fixed) |
1 (0.00136554s) |
1 (0.00232027s) |
1 (0.00577741s) |
1.14754 (0.0172372s) |
gmp_int |
1.50501 (0.00205515s) |
1.52968 (0.00354926s) |
1.01989 (0.0058923s) |
1 (0.015021s) |
tommath_int |
12.2161 (0.0166816s) |
16.9577 (0.0393463s) |
18.7474 (0.108311s) |
22.7368 (0.341528s) |
Table 1.58. Operator |
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0301617s) |
1 (0.0423404s) |
1 (0.0522358s) |
1 (0.0813156s) |
cpp_int(fixed) |
1.0638 (0.0320861s) |
1.22566 (0.0518951s) |
1.28515 (0.0671305s) |
1.16118 (0.094422s) |
gmp_int |
1.76553 (0.0532514s) |
1.51489 (0.0641408s) |
1.70708 (0.0891706s) |
1.77346 (0.14421s) |
tommath_int |
4.37637 (0.131999s) |
3.46212 (0.146587s) |
2.91875 (0.152463s) |
4.19621 (0.341217s) |
Table 1.59. Operator |(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0289129s) |
1 (0.0351119s) |
1 (0.0406779s) |
1 (0.0525891s) |
cpp_int(fixed) |
1.06091 (0.030674s) |
1.25979 (0.0442336s) |
1.36194 (0.0554009s) |
1.37438 (0.0722772s) |
gmp_int |
4.92854 (0.142498s) |
4.34687 (0.152627s) |
3.71442 (0.151095s) |
2.981 (0.156768s) |
tommath_int |
10.9847 (0.317598s) |
9.37065 (0.329021s) |
8.53651 (0.347248s) |
11.2155 (0.589813s) |
Table 1.60. Operator ^
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0305149s) |
1 (0.04217s) |
1 (0.0525977s) |
1 (0.0816632s) |
cpp_int(fixed) |
1.01544 (0.0309861s) |
1.24872 (0.0526585s) |
1.26661 (0.066621s) |
1.15965 (0.0947007s) |
gmp_int |
1.64675 (0.0502505s) |
1.47181 (0.0620663s) |
1.66038 (0.0873322s) |
1.67895 (0.137108s) |
tommath_int |
4.30668 (0.131418s) |
3.45859 (0.145849s) |
2.91462 (0.153303s) |
4.15538 (0.339342s) |
Table 1.61. Operator ^(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.01566 (0.0296088s) |
1 (0.0356634s) |
1 (0.0401898s) |
1 (0.0514097s) |
cpp_int(fixed) |
1 (0.0291524s) |
1.2393 (0.0441976s) |
1.38556 (0.0556856s) |
1.38899 (0.0714075s) |
gmp_int |
4.68027 (0.136441s) |
4.15243 (0.14809s) |
3.74237 (0.150405s) |
3.0483 (0.156712s) |
tommath_int |
10.919 (0.318314s) |
9.16311 (0.326788s) |
8.62554 (0.346659s) |
11.6212 (0.597442s) |
Table 1.62. Operator &
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.0346 (0.0303431s) |
1 (0.0427309s) |
1 (0.0535587s) |
1.06945 (0.0828084s) |
cpp_int(fixed) |
1 (0.0293284s) |
1.10435 (0.04719s) |
1.05262 (0.0563769s) |
1 (0.0774309s) |
gmp_int |
1.86057 (0.0545675s) |
1.58432 (0.0676995s) |
1.69164 (0.0906018s) |
1.86625 (0.144505s) |
tommath_int |
4.4157 (0.129506s) |
3.60396 (0.154s) |
2.95985 (0.158525s) |
4.4032 (0.340944s) |
Table 1.63. Operator &(int)
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1.05874 (0.038946s) |
1 (0.0483903s) |
1 (0.063842s) |
1 (0.100361s) |
cpp_int(fixed) |
1 (0.0367853s) |
1.05827 (0.0512099s) |
1.09114 (0.0696605s) |
1.09432 (0.109826s) |
gmp_int |
3.92298 (0.144308s) |
2.99447 (0.144903s) |
2.228 (0.14224s) |
1.42296 (0.142809s) |
tommath_int |
8.79208 (0.323419s) |
7.02288 (0.339839s) |
5.65271 (0.36088s) |
6.27104 (0.629365s) |
Table 1.64. Operator <<
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0248801s) |
1.23196 (0.04s) |
1 (0.0424149s) |
1 (0.060157s) |
cpp_int(fixed) |
1.08931 (0.027102s) |
1.40572 (0.0456418s) |
1.3475 (0.0571542s) |
1.24573 (0.0749397s) |
gmp_int |
1.05561 (0.0262636s) |
1 (0.0324686s) |
1.09914 (0.0466199s) |
1.16315 (0.0699719s) |
tommath_int |
1.60497 (0.0399319s) |
2.13048 (0.0691737s) |
2.31219 (0.0980712s) |
2.74695 (0.165248s) |
Table 1.65. Operator >>
Backend |
128 Bits |
256 Bits |
512 Bits |
1024 Bits |
---|---|---|---|---|
cpp_int |
1 (0.0213349s) |
1.02127 (0.0295019s) |
1 (0.0327116s) |
1.13168 (0.0433804s) |
cpp_int(fixed) |
1.13514 (0.0242181s) |
1.16938 (0.0337803s) |
1.46999 (0.0480859s) |
1.60077 (0.061362s) |
gmp_int |
1.26614 (0.0270129s) |
1 (0.0288873s) |
1.42219 (0.0465221s) |
1 (0.0383329s) |
tommath_int |
12.0066 (0.25616s) |
10.2837 (0.297067s) |
9.99696 (0.327017s) |
16.0943 (0.616942s) |
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.
Linux x86_64 results are broadly similar, except that libtommath performs much better there.