tree a6cc65e60e5b97d56f29f5d6a068642b052d649a
parent 96a0bf28bfa0f7b46bb17678cf6e3e39fa9a10b1
author Tue Ly <lntue@google.com> 1636647772 -0500
committer Copybara-Service <copybara-worker@google.com> 1636674060 -0800

[libc] Simplify decimalStringToFloat and hexadecimalStringToFloat and improve their performance.

Combine two loops in decimalStringToFloat and hexadecimalStringToFloat that extract the digits and re-arrange them a little bit.  This slightly improves the performance of strtof and strtod:
Running libc_str_to_float_comparison_test parse-number-fxx-test_data/data/* on my machine (Ryzen 1700)
- with glibc: ~1.92 seconds
- with current implementation: ~1.78 seconds
- with this change: ~1.67 seconds

Differential Revision: https://reviews.llvm.org/D113681

GitOrigin-RevId: 499ca806dcfb5f5c842fb240e150140fb15011ed