2 Commits

Author	SHA1	Message	Date
Michael Jones	6f80339b18	[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	2021-10-04 21:08:02 +00:00
Tue Ly	4e5f8b4d8d	[libc] Add implementation of expm1f. ... Use expm1f(x) = exp(x) - 1 for |x| > ln(2). For |x| <= ln(2), divide it into 3 subintervals: [-ln2, -1/8], [-1/8, 1/8], [1/8, ln2] and use a degree-6 polynomial approximation generated by Sollya's fpminmax for each interval. Errors < 1.5 ULPs when we use fma to evaluate the polynomials. Differential Revision: https://reviews.llvm.org/D101134	2021-06-10 14:58:34 -04:00