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Bug 19124 – Investigate using RYU to convert floats to strings

Status: RESOLVED
Resolution: WORKSFORME
Severity: enhancement
Priority: P1
Component: phobos
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2018-07-27T23:57:11Z
Last change time: 2021-03-18T07:37:36Z
Assigned to: No Owner
Creator: Basile-z
See also: https://issues.dlang.org/show_bug.cgi?id=8424, https://issues.dlang.org/show_bug.cgi?id=18139

Comments

Comment #0 by b2.temp — 2018-07-27T23:57:11Z

Relying in the c standard library to do that is sometimes an issue. It's been encountered several time, e.g in std.json because snn.lib give different results that the gnu c library. It would also allow to get it to!string, format working at CTFE for float and double. Reference : https://github.com/ulfjack/ryu

Comment #1 by andre — 2018-07-28T19:42:28Z

I added your idea to the list of potential Symmetry Autumn of Code projects. Feel free to edit/enhance the text. https://wiki.dlang.org/SAOC_2018_ideas#Implementation_of_RYU_to_convert_floats_to_strings

Comment #2 by nick — 2018-12-27T12:41:26Z

> It would also allow to get it to!string, format working at CTFE > for float and double Stefan Koch has ported "a short and efficient implementation of the grisu2 algorithm" to CTFEable D code: https://forum.dlang.org/post/[email protected] He says "ryu however looks less fast for ctfe purposes": https://forum.dlang.org/post/[email protected]

Comment #3 by b2.temp — 2021-03-18T07:37:36Z

this has been investigated. The issue was not more specific than that.