rust/library/core
bors 4cf3dc19a1 Auto merge of #76017 - JulianKnodt:fmt_fast, r=nagisa
Use less divisions in display u128/i128

This PR is an absolute mess, and I need to test if it improves the speed of fmt::Display for u128/i128, but I think it's correct.
It hopefully is more efficient by cutting u128 into at most 2 u64s, and also chunks by 1e16 instead of just 1e4.

Also I specialized the implementations for uints to always be non-false because it bothered me that it was checked at all

Do not merge until I benchmark it and also clean up the god awful mess of spaghetti.
Based on prior work in #44583

cc: `@Dylan-DPC`

Due to work on `itoa` and suggestion in original issue:
r? `@dtolnay`
2020-10-04 02:24:20 +00:00
..
benches Use more efficient scheme for display u128/i128 2020-09-28 20:38:38 +00:00
src Auto merge of #76017 - JulianKnodt:fmt_fast, r=nagisa 2020-10-04 02:24:20 +00:00
tests Rollup merge of #76745 - workingjubilee:move-wrapping-tests, r=matklad 2020-10-03 00:31:08 +02:00
Cargo.toml mv std libs to library/ 2020-07-27 19:51:13 -05:00