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Side by Side Diff: third_party/WebKit/Source/platform/audio/DenormalDisabler.h

Issue 2384073002: reflow comments in platform/audio (Closed)
Patch Set: comments (heh!) Created 4 years, 2 months ago
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1 /* 1 /*
2 * Copyright (C) 2011, Google Inc. All rights reserved. 2 * Copyright (C) 2011, Google Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions 5 * modification, are permitted provided that the following conditions
6 * are met: 6 * are met:
7 * 1. Redistributions of source code must retain the above copyright 7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer. 8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright 9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the 10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution. 11 * documentation and/or other materials provided with the distribution.
12 * 12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN Y 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN Y 16 * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O N 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
23 * DAMAGE.
23 */ 24 */
24 25
25 #ifndef DenormalDisabler_h 26 #ifndef DenormalDisabler_h
26 #define DenormalDisabler_h 27 #define DenormalDisabler_h
27 28
28 #include "wtf/Allocator.h" 29 #include "wtf/Allocator.h"
29 #include "wtf/CPU.h" 30 #include "wtf/CPU.h"
30 #include "wtf/MathExtras.h" 31 #include "wtf/MathExtras.h"
31 #include <float.h> 32 #include <float.h>
32 33
(...skipping 61 matching lines...) Expand 10 before | Expand all | Expand 10 after
94 _controlfp_s(&unused, _DN_FLUSH, _MCW_DN); 95 _controlfp_s(&unused, _DN_FLUSH, _MCW_DN);
95 } 96 }
96 97
97 inline void restoreState() { 98 inline void restoreState() {
98 unsigned unused; 99 unsigned unused;
99 _controlfp_s(&unused, m_savedCSR, _MCW_DN); 100 _controlfp_s(&unused, m_savedCSR, _MCW_DN);
100 } 101 }
101 #elif CPU(ARM) || CPU(ARM64) 102 #elif CPU(ARM) || CPU(ARM64)
102 inline void disableDenormals() { 103 inline void disableDenormals() {
103 m_savedCSR = getStatusWord(); 104 m_savedCSR = getStatusWord();
104 // Bit 24 is the flush-to-zero mode control bit. Setting it to 1 flushes den ormals to 0. 105 // Bit 24 is the flush-to-zero mode control bit. Setting it to 1 flushes
106 // denormals to 0.
105 setStatusWord(m_savedCSR | (1 << 24)); 107 setStatusWord(m_savedCSR | (1 << 24));
106 } 108 }
107 109
108 inline void restoreState() { setStatusWord(m_savedCSR); } 110 inline void restoreState() { setStatusWord(m_savedCSR); }
109 111
110 inline int getStatusWord() { 112 inline int getStatusWord() {
111 int result; 113 int result;
112 #if CPU(ARM64) 114 #if CPU(ARM64)
113 asm volatile("mrs %x[result], FPCR" : [result] "=r"(result)); 115 asm volatile("mrs %x[result], FPCR" : [result] "=r"(result));
114 #else 116 #else
(...skipping 25 matching lines...) Expand all
140 return (fabs(f) < FLT_MIN) ? 0.0f : f; 142 return (fabs(f) < FLT_MIN) ? 0.0f : f;
141 } 143 }
142 }; 144 };
143 145
144 #endif 146 #endif
145 147
146 } // namespace blink 148 } // namespace blink
147 149
148 #undef HAVE_DENORMAL 150 #undef HAVE_DENORMAL
149 #endif // DenormalDisabler_h 151 #endif // DenormalDisabler_h
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