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Issue 1468313009: Revert of [machine-operator-reducer] fix float truncation (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years ago
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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 --turbo-filter=*
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 ]);
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