v8/test/mjsunit/smi-ops.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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const SMI_MAX = (1 << 30) - 1;
const SMI_MIN = -(1 << 30);
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));  // overflow
assertEquals(SMI_MAX + ONE, Add1Reversed(SMI_MAX));  // overflow
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));  // overflow
assertEquals(SMI_MAX + ONE_HUNDRED, Add100Reversed(SMI_MAX));  // overflow
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(1610612736, Shr1(SMI_MIN));
assertEquals(-536870912, 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));
assertEquals(6, Sar100(100));
assertEquals(12, Shr100Reversed(99));
assertEquals(12, Sar100Reversed(99));
assertEquals(201326592, Shr100(SMI_MIN));
assertEquals(-67108864, 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(-1073741724, Xor100(SMI_MIN));
assertEquals(-1073741724, Xor100Reversed(SMI_MIN));
assertEquals(78, Xor100(OBJ_42));
assertEquals(78, Xor100Reversed(OBJ_42));

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