41 lines
943 B
JavaScript
41 lines
943 B
JavaScript
|
// Copyright 2024 the V8 project authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style license that can be
|
||
|
|
// found in the LICENSE file.
|
||
|
|
|
||
|
|
// Flags: --allow-natives-syntax --turbofan --no-always-turbofan
|
||
|
|
|
||
|
|
class Vector {
|
||
|
|
constructor(x) {
|
||
|
|
this.x = x;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function magnitude(v) {
|
||
|
|
return v.x;
|
||
|
|
}
|
||
|
|
|
||
|
|
const zero = new Vector(0); // Map1
|
||
|
|
const anotherOldObject = new Vector(0); // Map1
|
||
|
|
|
||
|
|
%PrepareFunctionForOptimization(magnitude);
|
||
|
|
magnitude(zero);
|
||
|
|
|
||
|
|
const nonzero = new Vector(0.6); // Map2
|
||
|
|
|
||
|
|
// Map1 is now deprecated but Map2 is not a migration target.
|
||
|
|
|
||
|
|
%OptimizeFunctionOnNextCall(magnitude);
|
||
|
|
magnitude(zero);
|
||
|
|
|
||
|
|
// The first call immediately deopts
|
||
|
|
assertUnoptimized(magnitude);
|
||
|
|
|
||
|
|
// But we learn and don't deopt any more.
|
||
|
|
%OptimizeFunctionOnNextCall(magnitude);
|
||
|
|
magnitude(zero);
|
||
|
|
assertOptimized(magnitude);
|
||
|
|
|
||
|
|
// Also passing other old objects won't deopt.
|
||
|
|
magnitude(anotherOldObject);
|
||
|
|
assertOptimized(magnitude);
|