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Issue 2700123003: DO NOT COMMIT: Results of running old (current) clang-format on Blink (Closed)
Patch Set: Created 3 years, 10 months ago
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1 // Copyright 2010 the V8 project authors. All rights reserved. 1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 27
28 #include "diy-fp.h" 28 #include "diy-fp.h"
29 29
30 #include "utils.h" 30 #include "utils.h"
31 31
32 namespace WTF { 32 namespace WTF {
33 33
34 namespace double_conversion { 34 namespace double_conversion {
35 35
36 void DiyFp::Multiply(const DiyFp& other) { 36 void DiyFp::Multiply(const DiyFp& other) {
37 // Simply "emulates" a 128 bit multiplication. 37 // Simply "emulates" a 128 bit multiplication.
38 // However: the resulting number only contains 64 bits. The least 38 // However: the resulting number only contains 64 bits. The least
39 // significant 64 bits are only used for rounding the most significant 6 4 39 // significant 64 bits are only used for rounding the most significant 64
40 // bits. 40 // bits.
41 const uint64_t kM32 = 0xFFFFFFFFU; 41 const uint64_t kM32 = 0xFFFFFFFFU;
42 uint64_t a = f_ >> 32; 42 uint64_t a = f_ >> 32;
43 uint64_t b = f_ & kM32; 43 uint64_t b = f_ & kM32;
44 uint64_t c = other.f_ >> 32; 44 uint64_t c = other.f_ >> 32;
45 uint64_t d = other.f_ & kM32; 45 uint64_t d = other.f_ & kM32;
46 uint64_t ac = a * c; 46 uint64_t ac = a * c;
47 uint64_t bc = b * c; 47 uint64_t bc = b * c;
48 uint64_t ad = a * d; 48 uint64_t ad = a * d;
49 uint64_t bd = b * d; 49 uint64_t bd = b * d;
50 uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32); 50 uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32);
51 // By adding 1U << 31 to tmp we round the final result. 51 // By adding 1U << 31 to tmp we round the final result.
52 // Halfway cases will be round up. 52 // Halfway cases will be round up.
53 tmp += 1U << 31; 53 tmp += 1U << 31;
54 uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32); 54 uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32);
55 e_ += other.e_ + 64; 55 e_ += other.e_ + 64;
56 f_ = result_f; 56 f_ = result_f;
57 } 57 }
58 58
59 } // namespace double_conversion 59 } // namespace double_conversion
60 60
61 } // namespace WTF 61 } // namespace WTF
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