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1 /*
2 * Copyright (C) 2015 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef MathCommon_h
27 #define MathCommon_h
28
29 #include "JITOperations.h"
30
31 #ifndef JIT_OPERATION
32 #define JIT_OPERATION
33 #endif
34
35 namespace JSC {
36 double JIT_OPERATION operationMathPow(double x, double y) WTF_INTERNAL;
37
38 inline int clz32(uint32_t number)
39 {
40 #if COMPILER(GCC) || COMPILER(CLANG)
41 int zeroCount = 32;
42 if (number)
43 zeroCount = __builtin_clz(number);
44 return zeroCount;
45 #else
46 int zeroCount = 0;
47 for (int i = 31; i >= 0; i--) {
48 if (!(number >> i))
49 zeroCount++;
50 else
51 break;
52 }
53 return zeroCount;
54 #endif
55 }
56
57 extern "C" {
58 double JIT_OPERATION jsRound(double value) REFERENCED_FROM_ASM WTF_INTERNAL;
59 }
60
61 }
62
63 #endif // MathCommon_h