0a7010458a
This shaves 416+ KB, just under 1% off the size of the debug d8 executable on Linux (mostly because the CheckHelper functions for assertions were getting separate copies for each compilation unit). The difference in release builds is negligible---a size reduction of 0.1%. Also, change namespace-level 'static const' variables to remove the static storage class as it's the default. R=danno@chromium.org BUG= TEST= Review URL: http://codereview.chromium.org/8680013 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10083 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
84 lines
3.7 KiB
C++
84 lines
3.7 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following
|
|
// disclaimer in the documentation and/or other materials provided
|
|
// with the distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived
|
|
// from this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#ifndef V8_FAST_DTOA_H_
|
|
#define V8_FAST_DTOA_H_
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
enum FastDtoaMode {
|
|
// Computes the shortest representation of the given input. The returned
|
|
// result will be the most accurate number of this length. Longer
|
|
// representations might be more accurate.
|
|
FAST_DTOA_SHORTEST,
|
|
// Computes a representation where the precision (number of digits) is
|
|
// given as input. The precision is independent of the decimal point.
|
|
FAST_DTOA_PRECISION
|
|
};
|
|
|
|
// FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not
|
|
// include the terminating '\0' character.
|
|
const int kFastDtoaMaximalLength = 17;
|
|
|
|
// Provides a decimal representation of v.
|
|
// The result should be interpreted as buffer * 10^(point - length).
|
|
//
|
|
// Precondition:
|
|
// * v must be a strictly positive finite double.
|
|
//
|
|
// Returns true if it succeeds, otherwise the result can not be trusted.
|
|
// There will be *length digits inside the buffer followed by a null terminator.
|
|
// If the function returns true and mode equals
|
|
// - FAST_DTOA_SHORTEST, then
|
|
// the parameter requested_digits is ignored.
|
|
// The result satisfies
|
|
// v == (double) (buffer * 10^(point - length)).
|
|
// The digits in the buffer are the shortest representation possible. E.g.
|
|
// if 0.099999999999 and 0.1 represent the same double then "1" is returned
|
|
// with point = 0.
|
|
// The last digit will be closest to the actual v. That is, even if several
|
|
// digits might correctly yield 'v' when read again, the buffer will contain
|
|
// the one closest to v.
|
|
// - FAST_DTOA_PRECISION, then
|
|
// the buffer contains requested_digits digits.
|
|
// the difference v - (buffer * 10^(point-length)) is closest to zero for
|
|
// all possible representations of requested_digits digits.
|
|
// If there are two values that are equally close, then FastDtoa returns
|
|
// false.
|
|
// For both modes the buffer must be large enough to hold the result.
|
|
bool FastDtoa(double d,
|
|
FastDtoaMode mode,
|
|
int requested_digits,
|
|
Vector<char> buffer,
|
|
int* length,
|
|
int* decimal_point);
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_FAST_DTOA_H_
|