rfc:grisu3-strtod
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rfc:grisu3-strtod [2011/07/15 16:26] – created dsp | rfc:grisu3-strtod [2011/07/15 16:34] – dsp | ||
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- | ====== Request for Comments: | + | ====== Request for Comments: |
- | * Version: | + | * Version: 0.9 |
* Date: 2011-07-15 | * Date: 2011-07-15 | ||
* Author: David Soria Parra <dsp at php dot net> | * Author: David Soria Parra <dsp at php dot net> | ||
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is David Gays strtod algorithm. This algorithm is used in PHP and can be found in zend_strtod. Recently | is David Gays strtod algorithm. This algorithm is used in PHP and can be found in zend_strtod. Recently | ||
Florian Loitsch found a new algorithm, called grisu3, to this problem. His algorithm is faster than David Gays algorithm. An | Florian Loitsch found a new algorithm, called grisu3, to this problem. His algorithm is faster than David Gays algorithm. An | ||
- | OpenSource implementation exists [[http:// | + | OpenSource implementation exists [[http:// |
+ | 0.5% cases. The library will fall back to David Gays algorithm in that case. | ||
===== Proposal ===== | ===== Proposal ===== | ||
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Using grisu3 will speed up string to double and double to string conversions. In particular json_encode and json_decode | Using grisu3 will speed up string to double and double to string conversions. In particular json_encode and json_decode | ||
- | of json data includign doubles will be faster. Simple microbenchmarks show about 30% faster json_decode. | + | of json data includign doubles will be faster. Simple microbenchmarks show about 20% faster json_decode. |
===== Common Misconceptions ===== | ===== Common Misconceptions ===== | ||
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There is a initial patchset at http:// | There is a initial patchset at http:// | ||
- | ==== More about Grisu3 ==== | + | ===== More about Grisu3 |
http:// | http:// |
rfc/grisu3-strtod.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1