tree b7701bf63d970748457d88aac3718af35314842f
parent 68fc9811e067b9d31217fcbd0856b770225c21c6
author Michael Jones <michaelrj@google.com> 1632525071 +0000
committer Copybara-Service <copybara-worker@google.com> 1633381816 -0700

[libc][NFC] Add supporting class for atof implementation

This change adds the High Precision Decimal described here:
https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html
It will be used for the atof implementation later, but is complete and
tested now.

The code is inspired by the golang implmentation of the HPD class, which
can be found here: https://github.com/golang/go/blob/release-branch.go1.16/src/strconv/decimal.go

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D110454

GitOrigin-RevId: 6f80339b18da61be986e75b4824ff5b308412ead