OLD | NEW |
1 // Copyright 2014 the V8 project authors. All rights reserved. | 1 // Copyright 2014 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 "src/runtime/runtime-utils.h" | 5 #include "src/runtime/runtime-utils.h" |
6 | 6 |
7 #include "src/arguments.h" | 7 #include "src/arguments.h" |
8 #include "src/assembler.h" | 8 #include "src/assembler.h" |
9 #include "src/base/utils/random-number-generator.h" | 9 #include "src/base/utils/random-number-generator.h" |
10 #include "src/bootstrapper.h" | 10 #include "src/bootstrapper.h" |
11 #include "src/codegen.h" | 11 #include "src/codegen.h" |
12 | 12 |
13 namespace v8 { | 13 namespace v8 { |
14 namespace internal { | 14 namespace internal { |
15 | 15 |
16 RUNTIME_FUNCTION(Runtime_DoubleHi) { | |
17 HandleScope scope(isolate); | |
18 DCHECK(args.length() == 1); | |
19 CONVERT_DOUBLE_ARG_CHECKED(x, 0); | |
20 uint64_t unsigned64 = double_to_uint64(x); | |
21 uint32_t unsigned32 = static_cast<uint32_t>(unsigned64 >> 32); | |
22 int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32); | |
23 return *isolate->factory()->NewNumber(signed32); | |
24 } | |
25 | |
26 | |
27 RUNTIME_FUNCTION(Runtime_DoubleLo) { | |
28 HandleScope scope(isolate); | |
29 DCHECK(args.length() == 1); | |
30 CONVERT_DOUBLE_ARG_CHECKED(x, 0); | |
31 uint64_t unsigned64 = double_to_uint64(x); | |
32 uint32_t unsigned32 = static_cast<uint32_t>(unsigned64); | |
33 int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32); | |
34 return *isolate->factory()->NewNumber(signed32); | |
35 } | |
36 | |
37 | |
38 RUNTIME_FUNCTION(Runtime_GenerateRandomNumbers) { | 16 RUNTIME_FUNCTION(Runtime_GenerateRandomNumbers) { |
39 HandleScope scope(isolate); | 17 HandleScope scope(isolate); |
40 DCHECK(args.length() == 1); | 18 DCHECK(args.length() == 1); |
41 if (isolate->serializer_enabled()) { | 19 if (isolate->serializer_enabled()) { |
42 // Random numbers in the snapshot are not really that random. And we cannot | 20 // Random numbers in the snapshot are not really that random. And we cannot |
43 // return a typed array as it cannot be serialized. To make calling | 21 // return a typed array as it cannot be serialized. To make calling |
44 // Math.random possible when creating a custom startup snapshot, we simply | 22 // Math.random possible when creating a custom startup snapshot, we simply |
45 // return a normal array with a single random number. | 23 // return a normal array with a single random number. |
46 Handle<HeapNumber> random_number = isolate->factory()->NewHeapNumber( | 24 Handle<HeapNumber> random_number = isolate->factory()->NewHeapNumber( |
47 isolate->random_number_generator()->NextDouble()); | 25 isolate->random_number_generator()->NextDouble()); |
(...skipping 37 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
85 base::RandomNumberGenerator::XorShift128(&state0, &state1); | 63 base::RandomNumberGenerator::XorShift128(&state0, &state1); |
86 array[i] = base::RandomNumberGenerator::ToDouble(state0, state1); | 64 array[i] = base::RandomNumberGenerator::ToDouble(state0, state1); |
87 } | 65 } |
88 // Persist current state. | 66 // Persist current state. |
89 array[kState0Offset] = uint64_to_double(state0); | 67 array[kState0Offset] = uint64_to_double(state0); |
90 array[kState1Offset] = uint64_to_double(state1); | 68 array[kState1Offset] = uint64_to_double(state1); |
91 return *typed_array; | 69 return *typed_array; |
92 } | 70 } |
93 } // namespace internal | 71 } // namespace internal |
94 } // namespace v8 | 72 } // namespace v8 |
OLD | NEW |