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Side by Side Diff: src/fast-dtoa.h

Issue 1968003: Revert r4591 (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: Created 10 years, 7 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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29 #define V8_FAST_DTOA_H_ 29 #define V8_FAST_DTOA_H_
30 30
31 namespace v8 { 31 namespace v8 {
32 namespace internal { 32 namespace internal {
33 33
34 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not 34 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not
35 // include the terminating '\0' character. 35 // include the terminating '\0' character.
36 static const int kFastDtoaMaximalLength = 17; 36 static const int kFastDtoaMaximalLength = 17;
37 37
38 // Provides a decimal representation of v. 38 // Provides a decimal representation of v.
39 // v must be a strictly positive finite double. 39 // v must not be (positive or negative) zero and it must not be Infinity or NaN.
40 // Returns true if it succeeds, otherwise the result can not be trusted. 40 // Returns true if it succeeds, otherwise the result can not be trusted.
41 // There will be *length digits inside the buffer followed by a null terminator. 41 // There will be *length digits inside the buffer followed by a null terminator.
42 // If the function returns true then 42 // If the function returns true then
43 // v == (double) (buffer * 10^(point - length)). 43 // v == (double) (buffer * 10^(point - length)).
44 // The digits in the buffer are the shortest representation possible: no 44 // The digits in the buffer are the shortest representation possible: no
45 // 0.099999999999 instead of 0.1. 45 // 0.099999999999 instead of 0.1.
46 // The last digit will be closest to the actual v. That is, even if several 46 // The last digit will be closest to the actual v. That is, even if several
47 // digits might correctly yield 'v' when read again, the buffer will contain the 47 // digits might correctly yield 'v' when read again, the buffer will contain the
48 // one closest to v. 48 // one closest to v.
49 // The variable 'sign' will be '0' if the given number is positive, and '1' 49 // The variable 'sign' will be '0' if the given number is positive, and '1'
50 // otherwise. 50 // otherwise.
51 bool FastDtoa(double d, 51 bool FastDtoa(double d,
52 Vector<char> buffer, 52 Vector<char> buffer,
53 int* sign,
53 int* length, 54 int* length,
54 int* point); 55 int* point);
55 56
56 } } // namespace v8::internal 57 } } // namespace v8::internal
57 58
58 #endif // V8_FAST_DTOA_H_ 59 #endif // V8_FAST_DTOA_H_
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