From: bors <bors@rust-lang.org>
Date: Thu, 11 Jan 2018 12:22:54 +0000 (+0000)
Subject: Auto merge of #47180 - varkor:range-iterator-overrides, r=alexcrichton
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=73ac5d6a80f26c692f1e084b72d69637d7de2c8c;p=rust.git

Auto merge of #47180 - varkor:range-iterator-overrides, r=alexcrichton

Add iterator method specialisations to Range*

Add specialised implementations of `max` for `Range`, and `last`, `min` and `max` for `RangeInclusive`, all of which lead to significant advantages in the generated assembly on x86.

Note that adding specialisations of `min` and `last` for `Range` led to no benefit, and adding `sum` for `Range` and `RangeInclusive` led to type inference issues (though this is possibly still worthwhile considering the performance gain).

This addresses some of the concerns in #39975.
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73ac5d6a80f26c692f1e084b72d69637d7de2c8c