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Merge pull request #3362 from dheaton-arm/implement-unarrow

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Implement `Unarrow`, `Uunarrow`, and `Snarrow` for the interpreter
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Chris Fallin
2021-09-21 10:06:46 -07:00
committed by GitHub
parent e0bd4bd007 3fc29f5f6c
commit 38728c5746
9 changed files with 166 additions and 10 deletions
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cranelift/codegen/meta/src/shared/instructions.rs
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@@ -4047,7 +4047,7 @@ pub(crate) fn define(
Combine `x` and `y` into a vector with twice the lanes but half the integer width while
saturating overflowing values to the unsigned maximum and minimum.
Note that all input lanes are considered unsigned.
Note that all input lanes are considered unsigned: any negative values will be interpreted as unsigned, overflowing and being replaced with the unsigned maximum.
The lanes will be concatenated after narrowing. For example, when `x` and `y` are `i32x4`
and `x = [x3, x2, x1, x0]` and `y = [y3, y2, y1, y0]`, then after narrowing the value