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Auto merge of #95317 - Jules-Bertholet:round_ties_to_even, r=pnkfelix,m-ou-se,scottmcm

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Add `round_ties_even` to `f32` and `f64`

Tracking issue: #96710

Redux of #82273. See also #55107

Adds a new method, `round_ties_even`, to `f32` and `f64`, that rounds the float to the nearest integer , rounding halfway cases to the number with an even least significant bit. Uses the `roundeven` LLVM intrinsic to do this.

Of the five IEEE 754 rounding modes, this is the only one that doesn't already have a round-to-integer function exposed by Rust (others are `round`, `floor`, `ceil`, and `trunc`).  Ties-to-even is also the rounding mode used for int-to-float and float-to-float `as` casts, as well as float arithmentic operations. So not having an explicit rounding method for it seems like an oversight.

Bikeshed: this PR currently uses `round_ties_even` for the name of the method. But maybe `round_ties_to_even` is better, or `round_even`, or `round_to_even`?
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bors 2023-03-07 09:43:12 +00:00
commit 0a3b557d52
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2
compiler/rustc_span/src/symbol.rs
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@ -1197,6 +1197,8 @@ symbols! {
rlib,
rotate_left,
rotate_right,
roundevenf32,
roundevenf64,
roundf32,
roundf64,
rt,