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Compiler: optimize (x | 0) >>> 0 #1177

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Merged
merged 1 commit into from
Nov 21, 2021
Merged

Compiler: optimize (x | 0) >>> 0 #1177

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1 change: 1 addition & 0 deletions CHANGES.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
## Features/Changes
* Compiler: static evaluation of backend_type
* Compiler: speedup emitting js files.
* Compiler: simplify (a | 0) >>> 0 into (a >>> 0)
* Lib: add messageEvent to Dom_html
* Lib: add PerformanceObserver API
* Lib: add CSSStyleDeclaration.{setProperty, getPropertyValue, getPropertyPriority, removeProperty}
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5 changes: 5 additions & 0 deletions compiler/lib/generate.ml
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Expand Up @@ -240,6 +240,11 @@ let to_int cx = J.EBin (J.Bor, cx, int 0)
let unsigned' x = J.EBin (J.Lsr, x, int 0)

let unsigned x =
let x =
match x with
| J.EBin (J.Bor, x, J.ENum maybe_zero) when J.Num.is_zero maybe_zero -> x
| _ -> x
in
let pos_int32 =
match x with
| J.ENum num -> ( try Int32.(J.Num.to_int32 num >= 0l) with _ -> false)
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