digitalmars.D.bugs - [Issue 18559] New: std.math.* should stop using `real` overloads by
- d-bugmail puremagic.com (25/25) Mar 05 2018 https://issues.dlang.org/show_bug.cgi?id=18559
https://issues.dlang.org/show_bug.cgi?id=18559 Issue ID: 18559 Summary: std.math.* should stop using `real` overloads by default Product: D Version: D2 Hardware: x86 OS: All Status: NEW Severity: enhancement Priority: P1 Component: phobos Assignee: nobody puremagic.com Reporter: hsteoh quickfur.ath.cx Using 80-bit reals on x86 causes major performance degradations in std.math functions like atan(). This poor performance is on the brink of turning away a significant group of potential D users, and needs to be taken seriously: Cf.: https://forum.dlang.org/post/aepfpjkytvpnzgizvpwh forum.dlang.org It's about time we take off our blinders and stop pretending that 80-bit "extra" precision buys us anything. Let 80-bit be an option if the user wants to, sure. But can we please, pretty please, change the default type in std.math.* to double instead of real. This is making our "fast code fast" slogan look absolutely ridiculous when people run benchmarks like that linked to above, and see D performing horribly slow compared to C++. --
Mar 05 2018