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Issue 304153016: Use full include paths everywhere (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 6 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "../include/v8stdint.h" 5 #include "include/v8stdint.h"
6 #include "globals.h" 6 #include "src/globals.h"
7 #include "checks.h" 7 #include "src/checks.h"
8 #include "diy-fp.h" 8 #include "src/diy-fp.h"
9 9
10 namespace v8 { 10 namespace v8 {
11 namespace internal { 11 namespace internal {
12 12
13 void DiyFp::Multiply(const DiyFp& other) { 13 void DiyFp::Multiply(const DiyFp& other) {
14 // Simply "emulates" a 128 bit multiplication. 14 // Simply "emulates" a 128 bit multiplication.
15 // However: the resulting number only contains 64 bits. The least 15 // However: the resulting number only contains 64 bits. The least
16 // significant 64 bits are only used for rounding the most significant 64 16 // significant 64 bits are only used for rounding the most significant 64
17 // bits. 17 // bits.
18 const uint64_t kM32 = 0xFFFFFFFFu; 18 const uint64_t kM32 = 0xFFFFFFFFu;
19 uint64_t a = f_ >> 32; 19 uint64_t a = f_ >> 32;
20 uint64_t b = f_ & kM32; 20 uint64_t b = f_ & kM32;
21 uint64_t c = other.f_ >> 32; 21 uint64_t c = other.f_ >> 32;
22 uint64_t d = other.f_ & kM32; 22 uint64_t d = other.f_ & kM32;
23 uint64_t ac = a * c; 23 uint64_t ac = a * c;
24 uint64_t bc = b * c; 24 uint64_t bc = b * c;
25 uint64_t ad = a * d; 25 uint64_t ad = a * d;
26 uint64_t bd = b * d; 26 uint64_t bd = b * d;
27 uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32); 27 uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32);
28 // By adding 1U << 31 to tmp we round the final result. 28 // By adding 1U << 31 to tmp we round the final result.
29 // Halfway cases will be round up. 29 // Halfway cases will be round up.
30 tmp += 1U << 31; 30 tmp += 1U << 31;
31 uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32); 31 uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32);
32 e_ += other.e_ + 64; 32 e_ += other.e_ + 64;
33 f_ = result_f; 33 f_ = result_f;
34 } 34 }
35 35
36 } } // namespace v8::internal 36 } } // namespace v8::internal
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