src/v8/test/mjsunit/math-abs.js

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// Flags: --max-semi-space-size=1 --allow-natives-syntax

function zero() {
  var x = 0.5;
  return (function() { return x - 0.5; })();
}

function test() {
  assertEquals(0, Math.abs(0));
  assertEquals(0, Math.abs(zero()));
  assertEquals(0, Math.abs(-0));
  assertEquals(Infinity, Math.abs(Infinity));
  assertEquals(Infinity, Math.abs(-Infinity));
  assertEquals(NaN, Math.abs(NaN));
  assertEquals(NaN, Math.abs(-NaN));
  assertEquals('Infinity', Math.abs(Number('+Infinity')).toString());
  assertEquals('Infinity', Math.abs(Number('-Infinity')).toString());
  assertEquals('NaN', Math.abs(NaN).toString());
  assertEquals('NaN', Math.abs(-NaN).toString());

  assertEquals(0.1, Math.abs(0.1));
  assertEquals(0.5, Math.abs(0.5));
  assertEquals(0.1, Math.abs(-0.1));
  assertEquals(0.5, Math.abs(-0.5));
  assertEquals(1, Math.abs(1));
  assertEquals(1.1, Math.abs(1.1));
  assertEquals(1.5, Math.abs(1.5));
  assertEquals(1, Math.abs(-1));
  assertEquals(1.1, Math.abs(-1.1));
  assertEquals(1.5, Math.abs(-1.5));

  assertEquals(Number.MIN_VALUE, Math.abs(Number.MIN_VALUE));
  assertEquals(Number.MIN_VALUE, Math.abs(-Number.MIN_VALUE));
  assertEquals(Number.MAX_VALUE, Math.abs(Number.MAX_VALUE));
  assertEquals(Number.MAX_VALUE, Math.abs(-Number.MAX_VALUE));

  // 2^30 is a smi boundary on arm and ia32.
  var two_30 = 1 << 30;

  assertEquals(two_30, Math.abs(two_30));
  assertEquals(two_30, Math.abs(-two_30));

  assertEquals(two_30 + 1, Math.abs(two_30 + 1));
  assertEquals(two_30 + 1, Math.abs(-two_30 - 1));

  assertEquals(two_30 - 1, Math.abs(two_30 - 1));
  assertEquals(two_30 - 1, Math.abs(-two_30 + 1));

  // 2^31 is a smi boundary on x64.
  var two_31 = 2 * two_30;

  assertEquals(two_31, Math.abs(two_31));
  assertEquals(two_31, Math.abs(-two_31));

  assertEquals(two_31 + 1, Math.abs(two_31 + 1));
  assertEquals(two_31 + 1, Math.abs(-two_31 - 1));

  assertEquals(two_31 - 1, Math.abs(two_31 - 1));
  assertEquals(two_31 - 1, Math.abs(-two_31 + 1));

  assertEquals(NaN, Math.abs("not a number"));
  assertEquals(NaN, Math.abs([1, 2, 3]));
  assertEquals(42, Math.abs({valueOf: function() { return 42; } }));
  assertEquals(42, Math.abs({valueOf: function() { return -42; } }));
}


// Test in a loop to cover the custom IC and GC-related issues.
for (var i = 0; i < 500; i++) {
  test();
}

// Regression test for optimized version of Math.abs, see:
// http://codereview.chromium.org/6875002.
function foo(x) {
  return Math.abs(x);
}
// Get some smi type feedback.
for(var i = 0; i < 1000; i++) {
  foo(-i);
}
assertEquals(42, foo(-42));
%OptimizeFunctionOnNextCall(foo)
assertEquals(42, foo(-42));

// Regression test for SMI input of Math.abs on X64, see:
// https://codereview.chromium.org/21180004/
var a = [-1, -2];
function foo2() {
  return Math.abs(a[0]);
}
assertEquals(1, foo2());
assertEquals(1, foo2());
%OptimizeFunctionOnNextCall(foo2);
assertEquals(1, foo2());

// Regression test for Integer input of Math.abs on mips64.
function absHalf(bits) {
  var x = 1 << (bits - 1);
  var half = Math.abs(x);
  return half;

}

// Create minimum integer input for abs() using bitwise operations
// that should overflow.
bits = 32;
assertEquals(2147483648, absHalf(bits));
assertEquals(2147483648, absHalf(bits));
%OptimizeFunctionOnNextCall(absHalf);
assertEquals(2147483648, absHalf(bits));