// 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));
})();