[wayne@cs.toronto.edu: Cygwin-1.5.5 sscanf on floats: 20 times slower than 2 years ago]
J. Johnston
jjohnstn@redhat.com
Fri Nov 21 19:53:00 GMT 2003
Wayne Hayes wrote:
>>Since scanf and the floating point arithmetic is implemented in newlib,
>>I've redirected this message there. Does anybody have an idea, what
>>could slow down float scanning in sscanf by a factor of 20?
>
>
> Thanks! Just to be pedentic, I realized that it's worse than a factor of 20.
> My *entire simulation* slows down by a factor of 20; there's significant
> other computation in it. So the scanf slowdown is probably closer to
> hundreds of times. *Something* fishy must be going on. :-)
>
The reason for the slow down is long double support. A new routine _strtold is
used instead of _strtod_r. I am working on a patch to use the old routine for
non-long-doubles to avoid the slow down.
-- Jeff J.
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