mirror of
https://github.com/fastfloat/fast_float.git
synced 2026-10-28 18:07:16 +08:00
b2e41e8b88
8.3.0 added the ECMAScript leading-zero rule as a runtime test on fmt inside
parse_number_string, so unlike basic_json_fmt its error returns and Annex B
octal scan land in the parser body that every from_chars instantiation
force-inlines. from_chars_caller<double>::call grew from 935 to 1031
instructions and other formats lost about 3% on short inputs.
Make the rule a compile-time parameter of the parser body, selected once at the
entry point, and take chars_format::javascript out to a cold conversion before
anything else is live so the branch is a tail call. parse_number_string keeps
its signature and behaviour.
benchmarks/benchmark.cpp, Intel Xeon 6975P-C, clang 22.1.8, cycles per float,
best of 7:
canada.txt mesh.txt
8.2.10 47.03 24.78
8.3.0 47.34 26.08
this 46.28 24.86
|
||
|---|---|---|
| .. | ||
| ascii_number.h | ||
| bigint.h | ||
| constexpr_feature_detect.h | ||
| decimal_to_binary.h | ||
| digit_comparison.h | ||
| fast_float.h | ||
| fast_table.h | ||
| float_common.h | ||
| parse_number.h | ||