b92d12d3fe
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. |
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