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| author | Cassio Neri <cassio.neri@gmail.com> | 2021-06-23 15:32:16 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2021-06-23 18:28:08 +0100 |
| commit | b92d12d3fe3f1aa56d190d960e40c62869a6cfbb (patch) | |
| tree | e27d94f4883acb7bcf3346f6a2e7b8b8a316d921 /gcc/fortran/dump-parse-tree.c | |
| parent | 53330b7d6848209d658c02be76c36aa5475a88c9 (diff) | |
| download | gcc-b92d12d3fe3f1aa56d190d960e40c62869a6cfbb.zip gcc-b92d12d3fe3f1aa56d190d960e40c62869a6cfbb.tar.gz gcc-b92d12d3fe3f1aa56d190d960e40c62869a6cfbb.tar.bz2 | |
libstdc++: More efficient std::chrono::year::leap
Simple change to std::chrono::year::is_leap. If a year is multiple of 100,
then it's divisible by 400 if and only if it's divisible by 16. The latter
allows for better code generation.
The expression is then either y%16 or y%4 which are both powers of two
and so it can be rearranged to use simple bitmask operations.
Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
Co-authored-by: Ulrich Drepper <drepper@redhat.com>
libstdc++-v3/ChangeLog:
* include/std/chrono (chrono::year::is_leap()): Optimize.
Diffstat (limited to 'gcc/fortran/dump-parse-tree.c')
0 files changed, 0 insertions, 0 deletions