mirror of
https://github.com/tc39/test262.git
synced 2025-05-05 07:20:27 +02:00
34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
// Copyright 2018 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
|
|
|
|
// This tests that NumberAdd passes on the right truncations
|
|
// even if it figures out during SimplifiedLowering that it
|
|
// can indeed do a Word32 operation (based on the feedback
|
|
// baked in for its inputs by other operators).
|
|
(function() {
|
|
// We need a + with Number feedback to get to a NumberAdd
|
|
// during the typed lowering pass of TurboFan's frontend.
|
|
function foo(x, y) { return x + y; }
|
|
foo(0.1, 0.2);
|
|
foo(0.1, 0.2);
|
|
|
|
// Now we need to fool TurboFan to think that it has to
|
|
// perform the `foo(x,-1)` on Float64 values until the
|
|
// very last moment (after the RETYPE phase of the
|
|
// SimplifiedLowering) where it realizes that the inputs
|
|
// and outputs of the NumberAdd allow it perform the
|
|
// operation on Word32.
|
|
function bar(x) {
|
|
x = Math.trunc(foo(x - 1, 1));
|
|
return foo(x, -1);
|
|
}
|
|
|
|
assertEquals(0, bar(1));
|
|
assertEquals(1, bar(2));
|
|
%OptimizeFunctionOnNextCall(bar);
|
|
assertEquals(2, bar(3));
|
|
})();
|