On Mon, 27 Dec 2004 18:16:21 +0800, Jason Wong <php-general@xxxxxxxxxxxx> wrote:
> ternary:
>
> $doo = -20;
> for ($i = 1; $i < 10000000; $i++) {
> $dah = ($doo < 0) ? - $doo : $doo;
> }
>
> abs():
>
> $doo = -20;
> for ($i = 1; $i < 10000000; $i++) {
> $dah = abs($doo);
> }
>
> It turns out that abs() is slightly faster - as you might have guessed,
> otherwise I wouldn't be posting this ;-)
>
> ternary = 14.67 secs
> abs() = 14.10 secs
With PHP 5.03 I found the exact opposite results, ternary is slightly faster:
> time ./ternary.php ;time ./abs.php
real 0m53.242s
user 0m26.655s
sys 0m0.017s
real 0m53.625s
user 0m26.732s
sys 0m0.019s
There has to be more overhead in calling a function than not,
especially after seeing the function.
PHP_FUNCTION(abs)
{
zval **value;
if (ZEND_NUM_ARGS()!=1||zend_get_parameters_ex(1, &value)==FAILURE) {
WRONG_PARAM_COUNT;
}
convert_scalar_to_number_ex(value);
if (Z_TYPE_PP(value) == IS_DOUBLE) {
RETURN_DOUBLE(fabs(Z_DVAL_PP(value)));
} else if (Z_TYPE_PP(value) == IS_LONG) {
if (Z_LVAL_PP(value) == LONG_MIN) {
RETURN_DOUBLE(-(double)LONG_MIN);
} else {
RETURN_LONG(Z_LVAL_PP(value) < 0 ? -Z_LVAL_PP(value) :
Z_LVAL_PP(value));
}
}
RETURN_FALSE;
}
--
Greg Donald
Zend Certified Engineer
http://gdconsultants.com/
http://destiney.com/
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