JezK

Edit File: int32-ops.js

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Repeat most the tests in smi-ops.js that use SMI_MIN and SMI_MAX, but
// with SMI_MIN and SMI_MAX from the 64-bit platform, which represents all
// signed 32-bit integer values as smis.

const SMI_MAX = (1 << 30) - 1 + (1 << 30);  // Create without overflowing.
const SMI_MIN = -SMI_MAX - 1;  // Create without overflowing.
const ONE = 1;
const ONE_HUNDRED = 100;

const OBJ_42 = new (function() {
  this.valueOf = function() { return 42; };
})();

assertEquals(42, OBJ_42.valueOf());

function Add1(x) {
  return x + 1;
}

function Add100(x) {
  return x + 100;
}

function Add1Reversed(x) {
  return 1 + x;
}

function Add100Reversed(x) {
  return 100 + x;
}

assertEquals(1, Add1(0));  // fast case
assertEquals(1, Add1Reversed(0));  // fast case
assertEquals(SMI_MAX + ONE, Add1(SMI_MAX), "smimax + 1");
assertEquals(SMI_MAX + ONE, Add1Reversed(SMI_MAX), "1 + smimax");
assertEquals(42 + ONE, Add1(OBJ_42));  // non-smi
assertEquals(42 + ONE, Add1Reversed(OBJ_42));  // non-smi

assertEquals(100, Add100(0));  // fast case
assertEquals(100, Add100Reversed(0));  // fast case
assertEquals(SMI_MAX + ONE_HUNDRED, Add100(SMI_MAX), "smimax + 100");
assertEquals(SMI_MAX + ONE_HUNDRED, Add100Reversed(SMI_MAX), " 100 + smimax");
assertEquals(42 + ONE_HUNDRED, Add100(OBJ_42));  // non-smi
assertEquals(42 + ONE_HUNDRED, Add100Reversed(OBJ_42));  // non-smi

function Sub1(x) {
  return x - 1;
}

function Sub100(x) {
  return x - 100;
}

function Sub1Reversed(x) {
  return 1 - x;
}

function Sub100Reversed(x) {
  return 100 - x;
}

assertEquals(0, Sub1(1));  // fast case
assertEquals(-1, Sub1Reversed(2));  // fast case
assertEquals(SMI_MIN - ONE, Sub1(SMI_MIN));  // overflow
assertEquals(ONE - SMI_MIN, Sub1Reversed(SMI_MIN));  // overflow
assertEquals(42 - ONE, Sub1(OBJ_42));  // non-smi
assertEquals(ONE - 42, Sub1Reversed(OBJ_42));  // non-smi

assertEquals(0, Sub100(100));  // fast case
assertEquals(1, Sub100Reversed(99));  // fast case
assertEquals(SMI_MIN - ONE_HUNDRED, Sub100(SMI_MIN));  // overflow
assertEquals(ONE_HUNDRED - SMI_MIN, Sub100Reversed(SMI_MIN));  // overflow
assertEquals(42 - ONE_HUNDRED, Sub100(OBJ_42));  // non-smi
assertEquals(ONE_HUNDRED - 42, Sub100Reversed(OBJ_42));  // non-smi

function Shr1(x) {
  return x >>> 1;
}

function Shr100(x) {
  return x >>> 100;
}

function Shr1Reversed(x) {
  return 1 >>> x;
}

function Shr100Reversed(x) {
  return 100 >>> x;
}

function Sar1(x) {
  return x >> 1;
}

function Sar100(x) {
  return x >> 100;
}

function Sar1Reversed(x) {
  return 1 >> x;
}

function Sar100Reversed(x) {
  return 100 >> x;
}

assertEquals(0, Shr1(1));
assertEquals(0, Sar1(1));
assertEquals(0, Shr1Reversed(2));
assertEquals(0, Sar1Reversed(2));
assertEquals(1073741824, Shr1(SMI_MIN));
assertEquals(-1073741824, Sar1(SMI_MIN));
assertEquals(1, Shr1Reversed(SMI_MIN));
assertEquals(1, Sar1Reversed(SMI_MIN));
assertEquals(21, Shr1(OBJ_42));
assertEquals(21, Sar1(OBJ_42));
assertEquals(0, Shr1Reversed(OBJ_42));
assertEquals(0, Sar1Reversed(OBJ_42));

assertEquals(6, Shr100(100), "100 >>> 100");
assertEquals(6, Sar100(100), "100 >> 100");
assertEquals(12, Shr100Reversed(99));
assertEquals(12, Sar100Reversed(99));
assertEquals(134217728, Shr100(SMI_MIN));
assertEquals(-134217728, Sar100(SMI_MIN));
assertEquals(100, Shr100Reversed(SMI_MIN));
assertEquals(100, Sar100Reversed(SMI_MIN));
assertEquals(2, Shr100(OBJ_42));
assertEquals(2, Sar100(OBJ_42));
assertEquals(0, Shr100Reversed(OBJ_42));
assertEquals(0, Sar100Reversed(OBJ_42));

function Xor1(x) {
  return x ^ 1;
}

function Xor100(x) {
  return x ^ 100;
}

function Xor1Reversed(x) {
  return 1 ^ x;
}

function Xor100Reversed(x) {
  return 100 ^ x;
}

assertEquals(0, Xor1(1));
assertEquals(3, Xor1Reversed(2));
assertEquals(SMI_MIN + 1, Xor1(SMI_MIN));
assertEquals(SMI_MIN + 1, Xor1Reversed(SMI_MIN));
assertEquals(43, Xor1(OBJ_42));
assertEquals(43, Xor1Reversed(OBJ_42));

assertEquals(0, Xor100(100));
assertEquals(7, Xor100Reversed(99));
assertEquals(-2147483548, Xor100(SMI_MIN));
assertEquals(-2147483548, Xor100Reversed(SMI_MIN));
assertEquals(78, Xor100(OBJ_42));
assertEquals(78, Xor100Reversed(OBJ_42));

var x = 0x23; var y = 0x35;
assertEquals(0x16, x ^ y);

// Bitwise not.
var v = 0;
assertEquals(-1, ~v);
v = SMI_MIN;
assertEquals(0x7fffffff, ~v, "~smimin");
v = SMI_MAX;
assertEquals(-0x80000000, ~v, "~smimax");

// Overflowing ++ and --.
v = SMI_MAX;
v++;
assertEquals(0x80000000, v, "smimax++");
v = SMI_MIN;
v--;
assertEquals(-0x80000001, v, "smimin--");

// Check that comparisons of numbers separated by MIN_SMI work.
assertFalse(SMI_MIN > 0);
assertFalse(SMI_MIN + 1 > 1);
assertFalse(SMI_MIN + 1 > 2);
assertFalse(SMI_MIN + 2 > 1);
assertFalse(0 < SMI_MIN);
assertTrue(-1 < SMI_MAX);
assertFalse(SMI_MAX < -1);

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