digitalmars.D.bugs - [Issue 17662] New: Replace 2.0^e2 with std.math.ldexp(1.0, cast(int)
- via Digitalmars-d-bugs (20/21) Jul 17 2017 https://issues.dlang.org/show_bug.cgi?id=17662
https://issues.dlang.org/show_bug.cgi?id=17662 Issue ID: 17662 Summary: Replace 2.0^e2 with std.math.ldexp(1.0, cast(int) e2) Product: D Version: D2 Hardware: All OS: All Status: NEW Keywords: performance Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: greensunny12 gmail.com See also: https://github.com/dlang/phobos/pull/5057It should be clear that just setting the exponent (some integer ops) is way faster than the current loop for bigger absolute N, but I didn't perform any speed tests.I'd rather drop this and add the optimization to the compiler, something like [1] [1] https://github.com/kinke/ldc/commit/dc01a338d73c2cdb843de6426f520f6c175640d3 --
Jul 17 2017