src/v8/test/mjsunit/bit-not.js

// Copyright 2009 the V8 project authors. All rights reserved.
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function testBitNot(x, name) {
  // The VM constant folds so we use that to check the result.
  var expected = eval("~(" + x + ")");
  var actual = ~x;
  assertEquals(expected, actual, "x: " + name);

  // Test the path where we can overwrite the result. Use -
  // to avoid concatenating strings.
  expected = eval("~(" + x + " - 0.01)");
  actual = ~(x - 0.01);
  assertEquals(expected, actual, "x - 0.01: " + name);
}


testBitNot(0, 0);
testBitNot(1, 1);
testBitNot(-1, 1);
testBitNot(100, 100);
testBitNot(0x40000000, "0x40000000");
testBitNot(0x7fffffff, "0x7fffffff");
testBitNot(0x80000000, "0x80000000");

testBitNot(2.2, 2.2);
testBitNot(-2.3, -2.3);
testBitNot(Infinity, "Infinity");
testBitNot(NaN, "NaN");
testBitNot(-Infinity, "-Infinity");
testBitNot(0x40000000 + 0.12345, "float1");
testBitNot(0x40000000 - 0.12345, "float2");
testBitNot(0x7fffffff + 0.12345, "float3");
testBitNot(0x7fffffff - 0.12345, "float4");
testBitNot(0x80000000 + 0.12345, "float5");
testBitNot(0x80000000 - 0.12345, "float6");

testBitNot("0", "string0");
testBitNot("2.3", "string2.3");
testBitNot("-9.4", "string-9.4");


// Try to test that we can deal with allocation failures in
// the fast path and just use the slow path instead.
function TryToGC() {
  var x = 0x40000000;
  // Put in an eval to foil Crankshaft.
  eval("");
  for (var i = 0; i < 1000000; i++) {
    assertEquals(~0x40000000, ~x);
  }
}
TryToGC();