uint128_t Benchmarks :: Boost.int128

Methodology

The benchmarks below represent the time in microseconds it takes to perform 20'000'000 operations between two values of random width (e.g. 2x1 words, 1x2 words, etc.). On most platforms we use the builtin unsigned __int128 as the reference benchmark. When this is unavailable (such as on 32-bit architectures) we use boost::multiprecision::uint128_t (abbreviated as boost::mp::uint128_t) as it is widely used, and known to be portable. On MSVC platforms we use as reference std::_Unsigned128 from the header <__msvc_int128.hpp> since this is bundled with their compiler.

Linux

x86_64

Operation	`unsigned __int128`	`uint128_t`	`boost::mp::uint128_t`	`absl::uint128`
Comparisons	2555576	2404372	3576079	2099066
Addition	242772	241336	328546	301186
Subtraction	372481	260064	287267	282908
Multiplication	356366	312736	326328	277284
Division	4481403	4498211	4602586	4290212
Modulo	3965562	4506879	4487023	4247367

ARM64

Operation	`unsigned __int128`	`uint128_t`	`boost::mp::uint128_t`	`absl::uint128`
Comparisons	4077924	2335044	5360167	4184235
Addition	137276	151553	184406	151276
Subtraction	155498	133470	186793	149111
Multiplication	218009	233811	324341	293431
Division	2254781	1819447	2211225	2152312
Modulo	2274294	1743274	2324356	2381378

S390x

Operation	`unsigned __int128`	`uint128_t`	`boost::mp::uint128_t`	`absl::uint128`
Comparisons	7293935	6198402	8182815	13820009
Addition	636224	707436	611849	1530136
Subtraction	572225	350035	595266	1211168
Multiplication	1040424	741789	899957	1843000
Division	4191637	2593472	4106663	4883553
Modulo	4156643	2133029	4398856	5011442

PPC64LE

Operation	`unsigned __int128`	`uint128_t`	`boost::mp::uint128_t`
Comparisons	5242604	4450958	5704848
Addition	221776	193063	847504
Subtraction	222894	175259	786659
Multiplication	194494	192929	795187
Division	4821119	4896360	5344637
Modulo	4955570	4273487	5407877

x86_32

This platform has no hardware type so we compare relative to boost::mp::uint128_t

Operation	`uint128_t`	`boost::mp::uint128_t`
Comparisons	9545542	8582001
Addition	686648	7261481
Subtraction	618456	7968678
Multiplication	859253	6746697
Division	8271920	15931092
Modulo	9932867	10242720

ARM32

This platform has no hardware type so we compare relative to boost::mp::uint128_t

Operation	`uint128_t`	`boost::mp::uint128_t`
Comparisons	5286033	4538707
Addition	454715	5543856
Subtraction	487190	6465126
Multiplication	1471479	8246098
Division	19868087	32820805
Modulo	20332627	27238658

Windows

x86_64

Operation	`std::_Unsigned128`	`uint128_t`	`boost::mp::uint128_t`
Comparisons	2055229	1714007	2490543
Addition	152603	116444	2596037
Subtraction	150576	116367	2901567
Multiplication	131223	123694	3300491
Division	1476783	1489919	4898388
Modulo	1421066	1411521	3793762

ARM64

Operation	`std::_Unsigned128`	`uint128_t`	`boost::mp::uint128_t`
Comparisons	945196	405891	1306884
Addition	37403	40039	1351728
Subtraction	33927	38887	1594845
Multiplication	74384	46406	1281286
Division	992963	790846	2035065
Modulo	1087702	861121	1702396

x86_32

Operation	`std::_Unsigned128`	`uint128_t`	`boost::mp::uint128_t`
Comparisons	4806287	3940703	2624013
Addition	254275	202421	2961566
Subtraction	1322877	207351	3703369
Multiplication	2327500	2312040	4375417
Division	5596877	5629510	6756883
Modulo	4616488	5696116	6409969

macOS

ARM64 (Apple Silicon)

Operation	`unsigned __int128`	`uint128_t`	`boost::mp::uint128_t`	`absl::uint128`
Comparisons	134425	134742	133107	135182
Addition	20754	18389	20653	20929
Subtraction	20552	18573	20590	20439
Multiplication	20264	20150	20181	20228
Division	685358	740877	913877	718985
Modulo	733080	699666	951657	719500