src/v8/test/mjsunit/compiler/minus-zero.js

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// Flags: --allow-natives-syntax

function add(x, y) {
  return x + y;
}

%PrepareFunctionForOptimization(add);
assertEquals(0, add(0, 0));
assertEquals(0, add(0, 0));
%OptimizeFunctionOnNextCall(add);
assertEquals(-0, add(-0, -0));


function testsin() {
  assertEquals(-0, Math.sin(-0));
}

%PrepareFunctionForOptimization(testsin);
testsin();
testsin();
%OptimizeFunctionOnNextCall(testsin);
testsin();


function testfloor() {
  assertEquals(-0, Math.floor(-0));
}

%PrepareFunctionForOptimization(testfloor);
testfloor();
testfloor();
%OptimizeFunctionOnNextCall(testfloor);
testfloor();


var double_one = Math.cos(0);

function add(a, b) {
  return a + b;
}

%PrepareFunctionForOptimization(add);
assertEquals(1, 1/add(double_one, 0));
assertEquals(1, 1/add(0, double_one));
%OptimizeFunctionOnNextCall(add);
assertEquals(1/(-0 + -0), 1/add(-0, -0));