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Date: Fri, 10 Nov 2006 13:34:57 +0300
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CC: Dmitry Stogov <dmitry@zend.com>, 
 Andrei Zmievski <andrei@gravitonic.com>
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Subject: zend_u_strtod() 400% speed up
From: antony@zend.com (Antony Dovgal)

Hello all.

I would like to propose a replacement for current zend_u_strtod() implementation.
The patch: http://tony2001.phpclub.net/dev/tmp/u_strtod.diff

According to my tests, new implementation is faster in about 40 (forty) times.
The simple script below takes ~1 sec to run with the patch and ~40 seconds without. 

<?php
$a = array(
    "0.1",
    "1.",
    "1.0",
    "23423423.234234",
    "0.00000E-2",
    "0.000002E+3",
    "121231312.1111",
    "000.11111111",
);

$start = microtime(true);
for ($i = 0; $i<100000; $i++) {
    foreach ($a as $d) { $double = (double)$d; }
}
var_dump(microtime(true) - $start);
?>

The only question here is which locale to use for number parsing/formatting.
I used "en_US_POSIX" and it doesn't seem to create any new problems, though I'd like to hear your comments.

-- 
Wbr, 
Antony Dovgal