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Issue 9638018: [v8-dev] Optimise Math.floor(x/y) to use integer division for specific divisor.... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: Created 8 years, 9 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 // Flags: --allow-natives-syntax --nouse_inlining
29
30 // Use this function as reference. Make sure it is not inlined.
31 function div(a, b) {
32 return a / b;
33 }
34
35 var limit = 0x1000000;
36 var exhaustive_limit = 100;
37 var step = 10;
38 var values = [0x10000001,
39 0x12345678,
40 -0x789abcdf, // 0x87654321
41 0x01234567,
42 0x76543210,
43 -0x80000000, // 0x80000000
44 0x7fffffff,
45 -0x0fffffff, // 0xf0000001
46 0x00000010,
47 -0x01000000 // 0xff000000
48 ];
49
50 function test_div() {
51 var c = 0;
52 for (var l = 0; l <= limit; l++) {
fschneider 2012/03/28 09:59:18 Maybe use a different letter (j, k?), since 1 and
Alexandre 2012/03/28 16:27:38 Done.
53 if (l > exhaustive_limit) { c += step; l += c; }
54 assertEquals(Math.floor(div(l, 1)), Math.floor(l / 1)); assertEquals(Mat h.floor(div(l, -1)), Math.floor(l / -1));
fschneider 2012/03/28 09:59:18 Please break the line at 80 chars.
Alexandre 2012/03/28 16:27:38 Done.
55 assertEquals(Math.floor(div(l, 2)), Math.floor(l / 2)); assertEquals(Mat h.floor(div(l, -2)), Math.floor(l / -2));
56 assertEquals(Math.floor(div(l, 3)), Math.floor(l / 3)); assertEquals(Mat h.floor(div(l, -3)), Math.floor(l / -3));
57 assertEquals(Math.floor(div(l, 4)), Math.floor(l / 4)); assertEquals(Mat h.floor(div(l, -4)), Math.floor(l / -4));
58 assertEquals(Math.floor(div(l, 5)), Math.floor(l / 5)); assertEquals(Mat h.floor(div(l, -5)), Math.floor(l / -5));
59 assertEquals(Math.floor(div(l, 6)), Math.floor(l / 6)); assertEquals(Mat h.floor(div(l, -6)), Math.floor(l / -6));
60 assertEquals(Math.floor(div(l, 7)), Math.floor(l / 7)); assertEquals(Mat h.floor(div(l, -7)), Math.floor(l / -7));
61 assertEquals(Math.floor(div(l, 8)), Math.floor(l / 8)); assertEquals(Mat h.floor(div(l, -8)), Math.floor(l / -8));
62 assertEquals(Math.floor(div(l, 9)), Math.floor(l / 9)); assertEquals(Mat h.floor(div(l, -9)), Math.floor(l / -9));
63 assertEquals(Math.floor(div(l, 10)), Math.floor(l / 10)); assertEquals(Mat h.floor(div(l, -10)), Math.floor(l / -10));
64 assertEquals(Math.floor(div(l, 11)), Math.floor(l / 11)); assertEquals(Mat h.floor(div(l, -11)), Math.floor(l / -11));
65 assertEquals(Math.floor(div(l, 12)), Math.floor(l / 12)); assertEquals(Mat h.floor(div(l, -12)), Math.floor(l / -12));
66 assertEquals(Math.floor(div(l, 13)), Math.floor(l / 13)); assertEquals(Mat h.floor(div(l, -13)), Math.floor(l / -13));
67 assertEquals(Math.floor(div(l, 14)), Math.floor(l / 14)); assertEquals(Mat h.floor(div(l, -14)), Math.floor(l / -14));
68 assertEquals(Math.floor(div(l, 15)), Math.floor(l / 15)); assertEquals(Mat h.floor(div(l, -15)), Math.floor(l / -15));
69 assertEquals(Math.floor(div(l, 16)), Math.floor(l / 16)); assertEquals(Mat h.floor(div(l, -16)), Math.floor(l / -16));
70 assertEquals(Math.floor(div(l, 17)), Math.floor(l / 17)); assertEquals(Mat h.floor(div(l, -17)), Math.floor(l / -17));
71 assertEquals(Math.floor(div(l, 18)), Math.floor(l / 18)); assertEquals(Mat h.floor(div(l, -18)), Math.floor(l / -18));
72 assertEquals(Math.floor(div(l, 19)), Math.floor(l / 19)); assertEquals(Mat h.floor(div(l, -19)), Math.floor(l / -19));
73 assertEquals(Math.floor(div(l, 20)), Math.floor(l / 20)); assertEquals(Mat h.floor(div(l, -20)), Math.floor(l / -20));
74 assertEquals(Math.floor(div(l, 21)), Math.floor(l / 21)); assertEquals(Mat h.floor(div(l, -21)), Math.floor(l / -21));
75 assertEquals(Math.floor(div(l, 22)), Math.floor(l / 22)); assertEquals(Mat h.floor(div(l, -22)), Math.floor(l / -22));
76 assertEquals(Math.floor(div(l, 23)), Math.floor(l / 23)); assertEquals(Mat h.floor(div(l, -23)), Math.floor(l / -23));
77 assertEquals(Math.floor(div(l, 24)), Math.floor(l / 24)); assertEquals(Mat h.floor(div(l, -24)), Math.floor(l / -24));
78 assertEquals(Math.floor(div(l, 25)), Math.floor(l / 25)); assertEquals(Mat h.floor(div(l, -25)), Math.floor(l / -25));
79 assertEquals(Math.floor(div(l, 125)), Math.floor(l / 125)); assertEquals(Mat h.floor(div(l, -125)), Math.floor(l / -125));
80 assertEquals(Math.floor(div(l, 625)), Math.floor(l / 625)); assertEquals(Mat h.floor(div(l, -625)), Math.floor(l / -625));
81 }
82 c = 0;
83 for (var l = 0; l <= limit; l++) {
84 if (l > exhaustive_limit) { c += step; l += c; }
85 assertEquals(Math.floor(div(-l, 1)), Math.floor(-l / 1)); assertEquals(M ath.floor(div(-l, -1)), Math.floor(-l / -1));
86 assertEquals(Math.floor(div(-l, 2)), Math.floor(-l / 2)); assertEquals(M ath.floor(div(-l, -2)), Math.floor(-l / -2));
87 assertEquals(Math.floor(div(-l, 3)), Math.floor(-l / 3)); assertEquals(M ath.floor(div(-l, -3)), Math.floor(-l / -3));
88 assertEquals(Math.floor(div(-l, 4)), Math.floor(-l / 4)); assertEquals(M ath.floor(div(-l, -4)), Math.floor(-l / -4));
89 assertEquals(Math.floor(div(-l, 5)), Math.floor(-l / 5)); assertEquals(M ath.floor(div(-l, -5)), Math.floor(-l / -5));
90 assertEquals(Math.floor(div(-l, 6)), Math.floor(-l / 6)); assertEquals(M ath.floor(div(-l, -6)), Math.floor(-l / -6));
91 assertEquals(Math.floor(div(-l, 7)), Math.floor(-l / 7)); assertEquals(M ath.floor(div(-l, -7)), Math.floor(-l / -7));
92 assertEquals(Math.floor(div(-l, 8)), Math.floor(-l / 8)); assertEquals(M ath.floor(div(-l, -8)), Math.floor(-l / -8));
93 assertEquals(Math.floor(div(-l, 9)), Math.floor(-l / 9)); assertEquals(M ath.floor(div(-l, -9)), Math.floor(-l / -9));
94 assertEquals(Math.floor(div(-l, 10)), Math.floor(-l / 10)); assertEquals(M ath.floor(div(-l, -10)), Math.floor(-l / -10));
95 assertEquals(Math.floor(div(-l, 11)), Math.floor(-l / 11)); assertEquals(M ath.floor(div(-l, -11)), Math.floor(-l / -11));
96 assertEquals(Math.floor(div(-l, 12)), Math.floor(-l / 12)); assertEquals(M ath.floor(div(-l, -12)), Math.floor(-l / -12));
97 assertEquals(Math.floor(div(-l, 13)), Math.floor(-l / 13)); assertEquals(M ath.floor(div(-l, -13)), Math.floor(-l / -13));
98 assertEquals(Math.floor(div(-l, 14)), Math.floor(-l / 14)); assertEquals(M ath.floor(div(-l, -14)), Math.floor(-l / -14));
99 assertEquals(Math.floor(div(-l, 15)), Math.floor(-l / 15)); assertEquals(M ath.floor(div(-l, -15)), Math.floor(-l / -15));
100 assertEquals(Math.floor(div(-l, 16)), Math.floor(-l / 16)); assertEquals(M ath.floor(div(-l, -16)), Math.floor(-l / -16));
101 assertEquals(Math.floor(div(-l, 17)), Math.floor(-l / 17)); assertEquals(M ath.floor(div(-l, -17)), Math.floor(-l / -17));
102 assertEquals(Math.floor(div(-l, 18)), Math.floor(-l / 18)); assertEquals(M ath.floor(div(-l, -18)), Math.floor(-l / -18));
103 assertEquals(Math.floor(div(-l, 19)), Math.floor(-l / 19)); assertEquals(M ath.floor(div(-l, -19)), Math.floor(-l / -19));
104 assertEquals(Math.floor(div(-l, 20)), Math.floor(-l / 20)); assertEquals(M ath.floor(div(-l, -20)), Math.floor(-l / -20));
105 assertEquals(Math.floor(div(-l, 21)), Math.floor(-l / 21)); assertEquals(M ath.floor(div(-l, -21)), Math.floor(-l / -21));
106 assertEquals(Math.floor(div(-l, 22)), Math.floor(-l / 22)); assertEquals(M ath.floor(div(-l, -22)), Math.floor(-l / -22));
107 assertEquals(Math.floor(div(-l, 23)), Math.floor(-l / 23)); assertEquals(M ath.floor(div(-l, -23)), Math.floor(-l / -23));
108 assertEquals(Math.floor(div(-l, 24)), Math.floor(-l / 24)); assertEquals(M ath.floor(div(-l, -24)), Math.floor(-l / -24));
109 assertEquals(Math.floor(div(-l, 25)), Math.floor(-l / 25)); assertEquals(M ath.floor(div(-l, -25)), Math.floor(-l / -25));
110 assertEquals(Math.floor(div(-l, 125)), Math.floor(-l / 125)); assertEquals(M ath.floor(div(-l, -125)), Math.floor(-l / -125));
111 assertEquals(Math.floor(div(-l, 625)), Math.floor(-l / 625)); assertEquals(M ath.floor(div(-l, -625)), Math.floor(-l / -625));
112 }
113 // Test for edge cases.
114 // Use (values[key] + 0) to force the integer type.
115 // (values[key] | 0) does not work anymore as it is optimized by hydrogen.)
116 for (var i = 0; i < values.length; i++) {
117 for (var j = 0; j < values.length; j++) {
118 assertEquals(Math.floor(div((values[i] + 0), (values[j] + 0))), Math.floor ((values[i] + 0) / (values[j] + 0)));
119 assertEquals(Math.floor(div(-(values[i] + 0), (values[j] + 0))), Math.floo r(-(values[i] + 0) / (values[j] + 0)));
120 assertEquals(Math.floor(div((values[i] + 0), -(values[j] + 0))), Math.floo r((values[i] + 0) / -(values[j] + 0)));
121 assertEquals(Math.floor(div(-(values[i] + 0), -(values[j] + 0))), Math.flo or(-(values[i] + 0) / -(values[j] + 0)));
122 }
123 }
124 }
125
126 test_div();
127 %OptimizeFunctionOnNextCall(test_div);
128 test_div();
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