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

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax --no-fold-constants

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

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


function test(x, y) {
  assertTrue(%_IsMinusZero(-0));
  assertTrue(%_IsMinusZero(1/(-Infinity)));
  assertTrue(%_IsMinusZero(x));

  assertFalse(%_IsMinusZero(0));
  assertFalse(%_IsMinusZero(1/Infinity));
  assertFalse(%_IsMinusZero(0.1));
  assertFalse(%_IsMinusZero(-0.2));
  assertFalse(%_IsMinusZero({}));
  assertFalse(%_IsMinusZero(""));
  assertFalse(%_IsMinusZero("-0"));
  assertFalse(%_IsMinusZero(function() {}));
  assertFalse(%_IsMinusZero(y));
}

test(-0, 1.2);
test(-0, 1.2);
%OptimizeFunctionOnNextCall(test);
test(-0, 1.2);
assertOptimized(test);


function testsin() {
  assertTrue(%_IsMinusZero(Math.sin(-0)));
}

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


function testfloor() {
  assertTrue(%_IsMinusZero(Math.floor(-0)));
  assertFalse(%_IsMinusZero(Math.floor(2)));
}

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


var double_one = Math.cos(0);

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

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