smi-ops.js 28.1 KB
Newer Older
1
// Copyright 2010 the V8 project authors. All rights reserved.
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
// 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.

28 29
const SMI_MAX = (1 << 29) - 1 + (1 << 29);  // Create without overflowing.
const SMI_MIN = -SMI_MAX - 1;  // Create without overflowing.
30 31 32 33 34 35 36
const ONE = 1;
const ONE_HUNDRED = 100;

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

37
assertEquals(42, OBJ_42.valueOf());
38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58


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
59 60
assertEquals(SMI_MAX + ONE, Add1(SMI_MAX), "smimax + 1");
assertEquals(SMI_MAX + ONE, Add1Reversed(SMI_MAX), "1 + smimax");
61 62 63 64 65
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
66 67
assertEquals(SMI_MAX + ONE_HUNDRED, Add100(SMI_MAX), "smimax + 100");
assertEquals(SMI_MAX + ONE_HUNDRED, Add100Reversed(SMI_MAX), " 100 + smimax");
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102
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
103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150


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));

151 152
assertEquals(6, Shr100(100), "100 >>> 100");
assertEquals(6, Sar100(100), "100 >> 100");
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
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);
198

199 200 201 202 203

// Bitwise not.
var v = 0;
assertEquals(-1, ~v);
v = SMI_MIN;
204
assertEquals(0x3fffffff, ~v, "~smimin");
205
v = SMI_MAX;
206
assertEquals(-0x40000000, ~v, "~smimax");
207 208 209 210

// Overflowing ++ and --.
v = SMI_MAX;
v++;
211
assertEquals(0x40000000, v, "smimax++");
212 213
v = SMI_MIN;
v--;
214
assertEquals(-0x40000001, v, "smimin--");
215

216 217 218 219 220 221 222 223 224
// 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);

225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
// Not actually Smi operations.
// Check that relations on unary ops work.
var v = -1.2;
assertTrue(v == v);
assertTrue(v === v);
assertTrue(v <= v);
assertTrue(v >= v);
assertFalse(v < v);
assertFalse(v > v);
assertFalse(v != v);
assertFalse(v !== v);

// Right hand side of unary minus is overwritable.
v = 1.5
assertEquals(-2.25, -(v * v));

// Smi input to bitop gives non-smi result where the rhs is a float that
// can be overwritten.
var x1 = 0x10000000;
var x2 = 0x40000002;
var x3 = 0x40000000;
246
assertEquals(0x40000000, x1 << (x2 - x3), "0x10000000<<1(1)");
247 248 249 250 251 252

// Smi input to bitop gives non-smi result where the rhs could be overwritten
// if it were a float, but it isn't.
x1 = 0x10000000
x2 = 4
x3 = 2
253
assertEquals(0x40000000, x1 << (x2 - x3), "0x10000000<<2(2)");
254 255


256 257 258 259 260 261 262 263 264 265 266 267 268 269
// Test shift operators on non-smi inputs, giving smi and non-smi results.
function testShiftNonSmis() {
  var pos_non_smi = 2000000000;
  var neg_non_smi = -pos_non_smi;
  var pos_smi = 1000000000;
  var neg_smi = -pos_smi;

  // Begin block A
  assertEquals(pos_non_smi, (pos_non_smi) >> 0);
  assertEquals(pos_non_smi, (pos_non_smi) >>> 0);
  assertEquals(pos_non_smi, (pos_non_smi) << 0);
  assertEquals(neg_non_smi, (neg_non_smi) >> 0);
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi) >>> 0);
  assertEquals(neg_non_smi, (neg_non_smi) << 0);
270 271 272 273 274 275
  assertEquals(pos_smi, (pos_smi) >> 0, "possmi >> 0");
  assertEquals(pos_smi, (pos_smi) >>> 0, "possmi >>>0");
  assertEquals(pos_smi, (pos_smi) << 0, "possmi << 0");
  assertEquals(neg_smi, (neg_smi) >> 0, "negsmi >> 0");
  assertEquals(neg_smi + 0x100000000, (neg_smi) >>> 0, "negsmi >>> 0");
  assertEquals(neg_smi, (neg_smi) << 0), "negsmi << 0";
276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294

  assertEquals(pos_non_smi / 2, (pos_non_smi) >> 1);
  assertEquals(pos_non_smi / 2, (pos_non_smi) >>> 1);
  assertEquals(-0x1194D800, (pos_non_smi) << 1);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >> 3);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >>> 3);
  assertEquals(-0x46536000, (pos_non_smi) << 3);
  assertEquals(0x73594000, (pos_non_smi) << 4);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >> 0);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >>> 0);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) << 0);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >> 1);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >>> 1);
  assertEquals(-0x1194D800, (pos_non_smi + 0.5) << 1);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >> 3);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >>> 3);
  assertEquals(-0x46536000, (pos_non_smi + 0.5) << 3);
  assertEquals(0x73594000, (pos_non_smi + 0.5) << 4);

295 296 297 298
  assertEquals(neg_non_smi / 2, (neg_non_smi) >> 1, "negnonsmi >> 1");

  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi) >>> 1,
               "negnonsmi >>> 1");
299 300 301 302 303 304
  assertEquals(0x1194D800, (neg_non_smi) << 1);
  assertEquals(neg_non_smi / 8, (neg_non_smi) >> 3);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi) >>> 3);
  assertEquals(0x46536000, (neg_non_smi) << 3);
  assertEquals(-0x73594000, (neg_non_smi) << 4);
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) >> 0);
305 306
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi - 0.5) >>> 0,
               "negnonsmi.5 >>> 0");
307 308
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) << 0);
  assertEquals(neg_non_smi / 2, (neg_non_smi - 0.5) >> 1);
309 310
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi - 0.5) >>> 1,
               "negnonsmi.5 >>> 1");
311 312 313 314 315 316 317 318 319 320 321 322 323
  assertEquals(0x1194D800, (neg_non_smi - 0.5) << 1);
  assertEquals(neg_non_smi / 8, (neg_non_smi - 0.5) >> 3);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi - 0.5) >>> 3);
  assertEquals(0x46536000, (neg_non_smi - 0.5) << 3);
  assertEquals(-0x73594000, (neg_non_smi - 0.5) << 4);

  assertEquals(pos_smi / 2, (pos_smi) >> 1);
  assertEquals(pos_smi / 2, (pos_smi) >>> 1);
  assertEquals(pos_non_smi, (pos_smi) << 1);
  assertEquals(pos_smi / 8, (pos_smi) >> 3);
  assertEquals(pos_smi / 8, (pos_smi) >>> 3);
  assertEquals(-0x2329b000, (pos_smi) << 3);
  assertEquals(0x73594000, (pos_smi) << 5);
324 325 326
  assertEquals(pos_smi, (pos_smi + 0.5) >> 0, "possmi.5 >> 0");
  assertEquals(pos_smi, (pos_smi + 0.5) >>> 0, "possmi.5 >>> 0");
  assertEquals(pos_smi, (pos_smi + 0.5) << 0, "possmi.5 << 0");
327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >> 1);
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >>> 1);
  assertEquals(pos_non_smi, (pos_smi + 0.5) << 1);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >> 3);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >>> 3);
  assertEquals(-0x2329b000, (pos_smi + 0.5) << 3);
  assertEquals(0x73594000, (pos_smi + 0.5) << 5);

  assertEquals(neg_smi / 2, (neg_smi) >> 1);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi) >>> 1);
  assertEquals(neg_non_smi, (neg_smi) << 1);
  assertEquals(neg_smi / 8, (neg_smi) >> 3);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi) >>> 3);
  assertEquals(0x46536000, (neg_smi) << 4);
  assertEquals(-0x73594000, (neg_smi) << 5);
342 343 344
  assertEquals(neg_smi, (neg_smi - 0.5) >> 0, "negsmi.5 >> 0");
  assertEquals(neg_smi + 0x100000000, (neg_smi - 0.5) >>> 0, "negsmi.5 >>> 0");
  assertEquals(neg_smi, (neg_smi - 0.5) << 0, "negsmi.5 << 0");
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364
  assertEquals(neg_smi / 2, (neg_smi - 0.5) >> 1);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi - 0.5) >>> 1);
  assertEquals(neg_non_smi, (neg_smi - 0.5) << 1);
  assertEquals(neg_smi / 8, (neg_smi - 0.5) >> 3);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi - 0.5) >>> 3);
  assertEquals(0x46536000, (neg_smi - 0.5) << 4);
  assertEquals(-0x73594000, (neg_smi - 0.5) << 5);
  // End block A

  // Repeat block A with 2^32 added to positive numbers and
  // 2^32 subtracted from negative numbers.
  // Begin block A repeat 1
  var two_32 = 0x100000000;
  var neg_32 = -two_32;
  assertEquals(pos_non_smi, (two_32 + pos_non_smi) >> 0);
  assertEquals(pos_non_smi, (two_32 + pos_non_smi) >>> 0);
  assertEquals(pos_non_smi, (two_32 + pos_non_smi) << 0);
  assertEquals(neg_non_smi, (neg_32 + neg_non_smi) >> 0);
  assertEquals(neg_non_smi + 0x100000000, (neg_32 + neg_non_smi) >>> 0);
  assertEquals(neg_non_smi, (neg_32 + neg_non_smi) << 0);
365 366 367 368
  assertEquals(pos_smi, (two_32 + pos_smi) >> 0, "2^32+possmi >> 0");
  assertEquals(pos_smi, (two_32 + pos_smi) >>> 0, "2^32+possmi >>> 0");
  assertEquals(pos_smi, (two_32 + pos_smi) << 0, "2^32+possmi << 0");
  assertEquals(neg_smi, (neg_32 + neg_smi) >> 0, "2^32+negsmi >> 0");
369
  assertEquals(neg_smi + 0x100000000, (neg_32 + neg_smi) >>> 0);
370
  assertEquals(neg_smi, (neg_32 + neg_smi) << 0, "2^32+negsmi << 0");
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434

  assertEquals(pos_non_smi / 2, (two_32 + pos_non_smi) >> 1);
  assertEquals(pos_non_smi / 2, (two_32 + pos_non_smi) >>> 1);
  assertEquals(-0x1194D800, (two_32 + pos_non_smi) << 1);
  assertEquals(pos_non_smi / 8, (two_32 + pos_non_smi) >> 3);
  assertEquals(pos_non_smi / 8, (two_32 + pos_non_smi) >>> 3);
  assertEquals(-0x46536000, (two_32 + pos_non_smi) << 3);
  assertEquals(0x73594000, (two_32 + pos_non_smi) << 4);
  assertEquals(pos_non_smi, (two_32 + pos_non_smi + 0.5) >> 0);
  assertEquals(pos_non_smi, (two_32 + pos_non_smi + 0.5) >>> 0);
  assertEquals(pos_non_smi, (two_32 + pos_non_smi + 0.5) << 0);
  assertEquals(pos_non_smi / 2, (two_32 + pos_non_smi + 0.5) >> 1);
  assertEquals(pos_non_smi / 2, (two_32 + pos_non_smi + 0.5) >>> 1);
  assertEquals(-0x1194D800, (two_32 + pos_non_smi + 0.5) << 1);
  assertEquals(pos_non_smi / 8, (two_32 + pos_non_smi + 0.5) >> 3);
  assertEquals(pos_non_smi / 8, (two_32 + pos_non_smi + 0.5) >>> 3);
  assertEquals(-0x46536000, (two_32 + pos_non_smi + 0.5) << 3);
  assertEquals(0x73594000, (two_32 + pos_non_smi + 0.5) << 4);

  assertEquals(neg_non_smi / 2, (neg_32 + neg_non_smi) >> 1);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_32 + neg_non_smi) >>> 1);
  assertEquals(0x1194D800, (neg_32 + neg_non_smi) << 1);
  assertEquals(neg_non_smi / 8, (neg_32 + neg_non_smi) >> 3);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_32 + neg_non_smi) >>> 3);
  assertEquals(0x46536000, (neg_32 + neg_non_smi) << 3);
  assertEquals(-0x73594000, (neg_32 + neg_non_smi) << 4);
  assertEquals(neg_non_smi, (neg_32 + neg_non_smi - 0.5) >> 0);
  assertEquals(neg_non_smi + 0x100000000, (neg_32 + neg_non_smi - 0.5) >>> 0);
  assertEquals(neg_non_smi, (neg_32 + neg_non_smi - 0.5) << 0);
  assertEquals(neg_non_smi / 2, (neg_32 + neg_non_smi - 0.5) >> 1);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_32 + neg_non_smi - 0.5)
               >>> 1);
  assertEquals(0x1194D800, (neg_32 + neg_non_smi - 0.5) << 1);
  assertEquals(neg_non_smi / 8, (neg_32 + neg_non_smi - 0.5) >> 3);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_32 + neg_non_smi - 0.5)
               >>> 3);
  assertEquals(0x46536000, (neg_32 + neg_non_smi - 0.5) << 3);
  assertEquals(-0x73594000, (neg_32 + neg_non_smi - 0.5) << 4);

  assertEquals(pos_smi / 2, (two_32 + pos_smi) >> 1);
  assertEquals(pos_smi / 2, (two_32 + pos_smi) >>> 1);
  assertEquals(pos_non_smi, (two_32 + pos_smi) << 1);
  assertEquals(pos_smi / 8, (two_32 + pos_smi) >> 3);
  assertEquals(pos_smi / 8, (two_32 + pos_smi) >>> 3);
  assertEquals(-0x2329b000, (two_32 + pos_smi) << 3);
  assertEquals(0x73594000, (two_32 + pos_smi) << 5);
  assertEquals(pos_smi, (two_32 + pos_smi + 0.5) >> 0);
  assertEquals(pos_smi, (two_32 + pos_smi + 0.5) >>> 0);
  assertEquals(pos_smi, (two_32 + pos_smi + 0.5) << 0);
  assertEquals(pos_smi / 2, (two_32 + pos_smi + 0.5) >> 1);
  assertEquals(pos_smi / 2, (two_32 + pos_smi + 0.5) >>> 1);
  assertEquals(pos_non_smi, (two_32 + pos_smi + 0.5) << 1);
  assertEquals(pos_smi / 8, (two_32 + pos_smi + 0.5) >> 3);
  assertEquals(pos_smi / 8, (two_32 + pos_smi + 0.5) >>> 3);
  assertEquals(-0x2329b000, (two_32 + pos_smi + 0.5) << 3);
  assertEquals(0x73594000, (two_32 + pos_smi + 0.5) << 5);

  assertEquals(neg_smi / 2, (neg_32 + neg_smi) >> 1);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_32 + neg_smi) >>> 1);
  assertEquals(neg_non_smi, (neg_32 + neg_smi) << 1);
  assertEquals(neg_smi / 8, (neg_32 + neg_smi) >> 3);
  assertEquals((neg_smi + 0x100000000) / 8, (neg_32 + neg_smi) >>> 3);
  assertEquals(0x46536000, (neg_32 + neg_smi) << 4);
  assertEquals(-0x73594000, (neg_32 + neg_smi) << 5);
435
  assertEquals(neg_smi, (neg_32 + neg_smi - 0.5) >> 0, "-2^32+negsmi.5 >> 0");
436
  assertEquals(neg_smi + 0x100000000, (neg_32 + neg_smi - 0.5) >>> 0);
437
  assertEquals(neg_smi, (neg_32 + neg_smi - 0.5) << 0, "-2^32+negsmi.5 << 0");
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462
  assertEquals(neg_smi / 2, (neg_32 + neg_smi - 0.5) >> 1);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_32 + neg_smi - 0.5) >>> 1);
  assertEquals(neg_non_smi, (neg_32 + neg_smi - 0.5) << 1);
  assertEquals(neg_smi / 8, (neg_32 + neg_smi - 0.5) >> 3);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_32 + neg_smi - 0.5) >>> 3);
  assertEquals(0x46536000, (neg_32 + neg_smi - 0.5) << 4);
  assertEquals(-0x73594000, (neg_32 + neg_smi - 0.5) << 5);
  // End block A repeat 1
  // Repeat block A with shift amounts in variables intialized with
  // a constant.
  var zero = 0;
  var one = 1;
  var three = 3;
  var four = 4;
  var five = 5;
  // Begin block A repeat 2
  assertEquals(pos_non_smi, (pos_non_smi) >> zero);
  assertEquals(pos_non_smi, (pos_non_smi) >>> zero);
  assertEquals(pos_non_smi, (pos_non_smi) << zero);
  assertEquals(neg_non_smi, (neg_non_smi) >> zero);
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi) >>> zero);
  assertEquals(neg_non_smi, (neg_non_smi) << zero);
  assertEquals(pos_smi, (pos_smi) >> zero);
  assertEquals(pos_smi, (pos_smi) >>> zero);
  assertEquals(pos_smi, (pos_smi) << zero);
463
  assertEquals(neg_smi, (neg_smi) >> zero, "negsmi >> zero");
464
  assertEquals(neg_smi + 0x100000000, (neg_smi) >>> zero);
465
  assertEquals(neg_smi, (neg_smi) << zero, "negsmi << zero");
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548

  assertEquals(pos_non_smi / 2, (pos_non_smi) >> one);
  assertEquals(pos_non_smi / 2, (pos_non_smi) >>> one);
  assertEquals(-0x1194D800, (pos_non_smi) << one);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >> three);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >>> three);
  assertEquals(-0x46536000, (pos_non_smi) << three);
  assertEquals(0x73594000, (pos_non_smi) << four);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >> zero);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >>> zero);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) << zero);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >> one);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >>> one);
  assertEquals(-0x1194D800, (pos_non_smi + 0.5) << one);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >> three);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >>> three);
  assertEquals(-0x46536000, (pos_non_smi + 0.5) << three);
  assertEquals(0x73594000, (pos_non_smi + 0.5) << four);

  assertEquals(neg_non_smi / 2, (neg_non_smi) >> one);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi) >>> one);
  assertEquals(0x1194D800, (neg_non_smi) << one);
  assertEquals(neg_non_smi / 8, (neg_non_smi) >> three);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi) >>> three);
  assertEquals(0x46536000, (neg_non_smi) << three);
  assertEquals(-0x73594000, (neg_non_smi) << four);
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) >> zero);
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi - 0.5) >>> zero);
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) << zero);
  assertEquals(neg_non_smi / 2, (neg_non_smi - 0.5) >> one);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi - 0.5) >>> one);
  assertEquals(0x1194D800, (neg_non_smi - 0.5) << one);
  assertEquals(neg_non_smi / 8, (neg_non_smi - 0.5) >> three);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi - 0.5)
      >>> three);
  assertEquals(0x46536000, (neg_non_smi - 0.5) << three);
  assertEquals(-0x73594000, (neg_non_smi - 0.5) << four);

  assertEquals(pos_smi / 2, (pos_smi) >> one);
  assertEquals(pos_smi / 2, (pos_smi) >>> one);
  assertEquals(pos_non_smi, (pos_smi) << one);
  assertEquals(pos_smi / 8, (pos_smi) >> three);
  assertEquals(pos_smi / 8, (pos_smi) >>> three);
  assertEquals(-0x2329b000, (pos_smi) << three);
  assertEquals(0x73594000, (pos_smi) << five);
  assertEquals(pos_smi, (pos_smi + 0.5) >> zero);
  assertEquals(pos_smi, (pos_smi + 0.5) >>> zero);
  assertEquals(pos_smi, (pos_smi + 0.5) << zero);
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >> one);
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >>> one);
  assertEquals(pos_non_smi, (pos_smi + 0.5) << one);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >> three);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >>> three);
  assertEquals(-0x2329b000, (pos_smi + 0.5) << three);
  assertEquals(0x73594000, (pos_smi + 0.5) << five);

  assertEquals(neg_smi / 2, (neg_smi) >> one);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi) >>> one);
  assertEquals(neg_non_smi, (neg_smi) << one);
  assertEquals(neg_smi / 8, (neg_smi) >> three);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi) >>> three);
  assertEquals(0x46536000, (neg_smi) << four);
  assertEquals(-0x73594000, (neg_smi) << five);
  assertEquals(neg_smi, (neg_smi - 0.5) >> zero);
  assertEquals(neg_smi + 0x100000000, (neg_smi - 0.5) >>> zero);
  assertEquals(neg_smi, (neg_smi - 0.5) << zero);
  assertEquals(neg_smi / 2, (neg_smi - 0.5) >> one);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi - 0.5) >>> one);
  assertEquals(neg_non_smi, (neg_smi - 0.5) << one);
  assertEquals(neg_smi / 8, (neg_smi - 0.5) >> three);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi - 0.5) >>> three);
  assertEquals(0x46536000, (neg_smi - 0.5) << four);
  assertEquals(-0x73594000, (neg_smi - 0.5) << five);
  // End block A repeat 2

  // Repeat previous block, with computed values in the shift variables.
  five = 0;
  while (five < 5 ) ++five;
  four = five - one;
  three = four - one;
  one = four - three;
  zero = one - one;

549
  // Begin block A repeat 3
550 551 552 553 554 555 556 557 558
  assertEquals(pos_non_smi, (pos_non_smi) >> zero);
  assertEquals(pos_non_smi, (pos_non_smi) >>> zero);
  assertEquals(pos_non_smi, (pos_non_smi) << zero);
  assertEquals(neg_non_smi, (neg_non_smi) >> zero);
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi) >>> zero);
  assertEquals(neg_non_smi, (neg_non_smi) << zero);
  assertEquals(pos_smi, (pos_smi) >> zero);
  assertEquals(pos_smi, (pos_smi) >>> zero);
  assertEquals(pos_smi, (pos_smi) << zero);
559
  assertEquals(neg_smi, (neg_smi) >> zero, "negsmi >> zero(2)");
560
  assertEquals(neg_smi + 0x100000000, (neg_smi) >>> zero);
561
  assertEquals(neg_smi, (neg_smi) << zero, "negsmi << zero(2)");
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624

  assertEquals(pos_non_smi / 2, (pos_non_smi) >> one);
  assertEquals(pos_non_smi / 2, (pos_non_smi) >>> one);
  assertEquals(-0x1194D800, (pos_non_smi) << one);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >> three);
  assertEquals(pos_non_smi / 8, (pos_non_smi) >>> three);
  assertEquals(-0x46536000, (pos_non_smi) << three);
  assertEquals(0x73594000, (pos_non_smi) << four);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >> zero);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) >>> zero);
  assertEquals(pos_non_smi, (pos_non_smi + 0.5) << zero);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >> one);
  assertEquals(pos_non_smi / 2, (pos_non_smi + 0.5) >>> one);
  assertEquals(-0x1194D800, (pos_non_smi + 0.5) << one);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >> three);
  assertEquals(pos_non_smi / 8, (pos_non_smi + 0.5) >>> three);
  assertEquals(-0x46536000, (pos_non_smi + 0.5) << three);
  assertEquals(0x73594000, (pos_non_smi + 0.5) << four);

  assertEquals(neg_non_smi / 2, (neg_non_smi) >> one);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi) >>> one);
  assertEquals(0x1194D800, (neg_non_smi) << one);
  assertEquals(neg_non_smi / 8, (neg_non_smi) >> three);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi) >>> three);
  assertEquals(0x46536000, (neg_non_smi) << three);
  assertEquals(-0x73594000, (neg_non_smi) << four);
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) >> zero);
  assertEquals(neg_non_smi + 0x100000000, (neg_non_smi - 0.5) >>> zero);
  assertEquals(neg_non_smi, (neg_non_smi - 0.5) << zero);
  assertEquals(neg_non_smi / 2, (neg_non_smi - 0.5) >> one);
  assertEquals(neg_non_smi / 2 + 0x100000000 / 2, (neg_non_smi - 0.5) >>> one);
  assertEquals(0x1194D800, (neg_non_smi - 0.5) << one);
  assertEquals(neg_non_smi / 8, (neg_non_smi - 0.5) >> three);
  assertEquals(neg_non_smi / 8 + 0x100000000 / 8, (neg_non_smi - 0.5)
      >>> three);
  assertEquals(0x46536000, (neg_non_smi - 0.5) << three);
  assertEquals(-0x73594000, (neg_non_smi - 0.5) << four);

  assertEquals(pos_smi / 2, (pos_smi) >> one);
  assertEquals(pos_smi / 2, (pos_smi) >>> one);
  assertEquals(pos_non_smi, (pos_smi) << one);
  assertEquals(pos_smi / 8, (pos_smi) >> three);
  assertEquals(pos_smi / 8, (pos_smi) >>> three);
  assertEquals(-0x2329b000, (pos_smi) << three);
  assertEquals(0x73594000, (pos_smi) << five);
  assertEquals(pos_smi, (pos_smi + 0.5) >> zero);
  assertEquals(pos_smi, (pos_smi + 0.5) >>> zero);
  assertEquals(pos_smi, (pos_smi + 0.5) << zero);
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >> one);
  assertEquals(pos_smi / 2, (pos_smi + 0.5) >>> one);
  assertEquals(pos_non_smi, (pos_smi + 0.5) << one);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >> three);
  assertEquals(pos_smi / 8, (pos_smi + 0.5) >>> three);
  assertEquals(-0x2329b000, (pos_smi + 0.5) << three);
  assertEquals(0x73594000, (pos_smi + 0.5) << five);

  assertEquals(neg_smi / 2, (neg_smi) >> one);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi) >>> one);
  assertEquals(neg_non_smi, (neg_smi) << one);
  assertEquals(neg_smi / 8, (neg_smi) >> three);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi) >>> three);
  assertEquals(0x46536000, (neg_smi) << four);
  assertEquals(-0x73594000, (neg_smi) << five);
625
  assertEquals(neg_smi, (neg_smi - 0.5) >> zero, "negsmi.5 >> zero");
626
  assertEquals(neg_smi + 0x100000000, (neg_smi - 0.5) >>> zero);
627
  assertEquals(neg_smi, (neg_smi - 0.5) << zero, "negsmi.5 << zero");
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
  assertEquals(neg_smi / 2, (neg_smi - 0.5) >> one);
  assertEquals(neg_smi / 2 + 0x100000000 / 2, (neg_smi - 0.5) >>> one);
  assertEquals(neg_non_smi, (neg_smi - 0.5) << one);
  assertEquals(neg_smi / 8, (neg_smi - 0.5) >> three);
  assertEquals(neg_smi / 8 + 0x100000000 / 8, (neg_smi - 0.5) >>> three);
  assertEquals(0x46536000, (neg_smi - 0.5) << four);
  assertEquals(-0x73594000, (neg_smi - 0.5) << five);
  // End block A repeat 3

  // Test non-integer shift value
  assertEquals(5, 20.5 >> 2.4);
  assertEquals(5, 20.5 >> 2.7);
  var shift = 2.4;
  assertEquals(5, 20.5 >> shift);
  assertEquals(5, 20.5 >> shift + 0.3);
  shift = shift + zero;
  assertEquals(5, 20.5 >> shift);
  assertEquals(5, 20.5 >> shift + 0.3);
}

testShiftNonSmis();
649

650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
function intConversion() {
  function foo(x) {
    assertEquals(x, (x * 1.0000000001) | 0, "foo more " + x);
    assertEquals(x, x | 0, "foo " + x);
    if (x > 0) {
      assertEquals(x - 1, (x * 0.9999999999) | 0, "foo less " + x);
    } else {
      assertEquals(x + 1, (x * 0.9999999999) | 0, "foo less " + x);
    }
  }
  for (var i = 1; i < 0x80000000; i *= 2) {
    foo(i);
    foo(-i);
  }
  for (var i = 1; i < 1/0; i *= 2) {
    assertEquals(i | 0, (i * 1.0000000000000001) | 0, "b" + i);
    assertEquals(-i | 0, (i * -1.0000000000000001) | 0, "c" + i);
  }
  for (var i = 0.5; i > 0; i /= 2) {
    assertEquals(0, i | 0, "d" + i);
    assertEquals(0, -i | 0, "e" + i);
  }
}

intConversion();
675 676 677 678 679 680

// Verify that we handle the (optimized) corner case of shifting by
// zero even for non-smis.
function shiftByZero(n) { return n << 0; }

assertEquals(3, shiftByZero(3.1415));
681 682 683 684 685 686 687 688 689

// Verify that the static type information of x >>> 32 is computed correctly.
function LogicalShiftRightByMultipleOf32(x) {
  x = x >>> 32;
  return x + x;
}

assertEquals(4589934592, LogicalShiftRightByMultipleOf32(-2000000000));
assertEquals(4589934592, LogicalShiftRightByMultipleOf32(-2000000000));
690 691 692 693 694 695 696

// Verify that the shift amount is reduced modulo 32, not modulo 64.
function LeftShiftThreeBy(x) {return 3 << x;}
assertEquals(24, LeftShiftThreeBy(3));
assertEquals(24, LeftShiftThreeBy(35));
assertEquals(24, LeftShiftThreeBy(67));
assertEquals(24, LeftShiftThreeBy(-29));
697 698 699 700 701

// Regression test for a bug in the ARM code generator.  For some register
// allocations we got the Smi overflow case wrong.
function f(x, y) { return y +  ( 1 << (x & 31)); }
assertEquals(-2147483647, f(31, 1));
702 703 704

// Regression test for correct handling of overflow in smi comparison.
assertTrue(-0x40000000 < 42);