The Eisel-Lemire ParseNumberF64 Algorithm

Add Eisel-Lemire algorithm for faster String#to_f by mensfeld · Pull Request #15655 · ruby/ruby

GitHub Ruby Dec 19, 2025

This PR adds the Eisel-Lemire algorithm for string-to-float conversion, providing significant performance improvements for String#to_f, especially for numbers with many significant digits. Performa...

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Floating-Point Printing and Parsing Can Be Simple And Fast (Floating Point Formatting, Part 3) Russ Cox January 19, 2026 research.swtch.com/fp Posted on Monday, January 19, 2026. PDF

research.swtch.com Russ Cox Sep 6, 1999

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Fast Unrounded Scaling: Proof by Ivy (Floating Point Formatting, Part 4) Russ Cox January 19, 2026 research.swtch.com/fp-proof Posted on Monday, January 19, 2026. PDF

research.swtch.com Russ Cox Jan 19, 2026

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Ruby Floats: When 2.6x Faster Is Actually Slower (and Then Faster Again)

Maciej Mensfeld; Closer to Code Maciej Mensfeld Dec 19, 2025

I implemented Eisel-Lemire for Ruby's String#to_f. It was 2.6x faster on paper, 9% slower in practice - until I found the right approach. Now it's 3.4x faster.

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Go 1.16 Release Notes

Golang Jan 1, 2020

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