1 // Copyright 2015 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Flags: --allow-natives-syntax 6 7 function mul(a, b) { 8 const l = a & 0x3ffffff; 9 const h = b & 0x3ffffff; 10 11 return (l * h) >>> 0; 12 } 13 14 function mulAndDiv(a, b) { 15 const l = a & 0x3ffffff; 16 const h = b & 0x3ffffff; 17 const m = l * h; 18 19 const rl = m & 0x3ffffff; 20 const rh = (m / 0x4000000) >>> 0; 21 22 return rl | rh; 23 } 24 25 function overflowMul(a, b) { 26 const l = a | 0; 27 const h = b | 0; 28 29 return (l * h) >>> 0; 30 } 31 32 function overflowDiv(a, b) { 33 const l = a & 0x3ffffff; 34 const h = b & 0x3ffffff; 35 const m = l * h; 36 37 return (m / 0x10) >>> 0; 38 } 39 40 function nonPowerOfTwoDiv(a, b) { 41 const l = a & 0x3ffffff; 42 const h = b & 0x3ffffff; 43 const m = l * h; 44 45 return (m / 0x4000001) >>> 0; 46 } 47 48 function test(fn, a, b, sets) { 49 const expected = fn(a, b); 50 fn(1, 2); 51 fn(0, 0); 52 %OptimizeFunctionOnNextCall(fn); 53 const actual = fn(a, b); 54 55 assertEquals(expected, actual); 56 57 sets.forEach(function(set, i) { 58 assertEquals(set.expected, fn(set.a, set.b), fn.name + ', set #' + i); 59 }); 60 } 61 62 test(mul, 0x3ffffff, 0x3ffffff, [ 63 { a: 0, b: 0, expected: 0 }, 64 { a: 0xdead, b: 0xbeef, expected: 0xa6144983 }, 65 { a: 0x1aa1dea, b: 0x2badead, expected: 0x35eb2322 } 66 ]); 67 test(mulAndDiv, 0x3ffffff, 0x3ffffff, [ 68 { a: 0, b: 0, expected: 0 }, 69 { a: 0xdead, b: 0xbeef, expected: 0x21449ab }, 70 { a: 0x1aa1dea, b: 0x2badead, expected: 0x1ebf32f } 71 ]); 72 test(overflowMul, 0x4ffffff, 0x4ffffff, [ 73 { a: 0, b: 0, expected: 0 }, 74 { a: 0xdead, b: 0xbeef, expected: 0xa6144983 }, 75 { a: 0x1aa1dea, b: 0x2badead, expected: 0x35eb2322 } 76 ]); 77 test(overflowDiv, 0x3ffffff, 0x3ffffff, [ 78 { a: 0, b: 0, expected: 0 }, 79 { a: 0xdead, b: 0xbeef, expected: 0xa614498 }, 80 { a: 0x1aa1dea, b: 0x2badead, expected: 0x835eb232 } 81 ]); 82 test(nonPowerOfTwoDiv, 0x3ffffff, 0x3ffffff, [ 83 { a: 0, b: 0, expected: 0 }, 84 { a: 0xdead, b: 0xbeef, expected: 0x29 }, 85 { a: 0x1aa1dea, b: 0x2badead, expected: 0x122d20d } 86 ]); 87
