{"id":1656,"date":"2014-09-03T18:36:06","date_gmt":"2014-09-04T01:36:06","guid":{"rendered":"http:\/\/boost-spirit.com\/home\/?p=1656"},"modified":"2014-09-03T18:55:48","modified_gmt":"2014-09-04T01:55:48","slug":"fastest-numeric-parsers-in-the-world","status":"publish","type":"post","link":"http:\/\/boost-spirit.com\/home\/2014\/09\/03\/fastest-numeric-parsers-in-the-world\/","title":{"rendered":"Fastest numeric parsers in the world!"},"content":{"rendered":"

Spirit.Qi numeric parsers are the fastest in the world of C++ and surpasses even hand-written low level parsers such as atoi and atof written in C. This is old news actually. The numeric parsers are highly optimised from the very start, when I started writing Spirit V2. The tests were written in 2009, yet are still very relevant now. Here are the benchmark results from the same tests I ran today on a Mac using Clang. The benchmark code is in Github (qi\/workbench<\/a>):<\/p>\n

Integer tests<\/h2>\n

atoi_test: \u00a04.7452590000 [s] {checksum: 213ce33a}
\nstrtol_test: 4.5116520000 [s] {checksum: 213ce33a}
\nspirit_int_test: 1.4126110000 [s] {checksum: 213ce33a}<\/p>\n

Double Tests<\/h2>\n

atof_test: 3.2435210000 [s] {checksum: 84a4f7d}
\nstrtod_test: 3.1327660000 [s] {checksum: 84a4f7d}
\nspirit_double_test: 0.7237810000 [s] {checksum: 84a4f7d}<\/p>\n

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