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Message-ID: <3FBE7A8A.6080005@redhat.com>
Date: Fri, 21 Nov 2003 15:50:18 -0500
From: "J. Johnston" <jjohnstn AT redhat DOT com>
Organization: Red Hat Inc.
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To: "J. Johnston" <jjohnstn AT redhat DOT com>
Cc: Wayne Hayes <wayne AT cs DOT toronto DOT edu>, newlib AT sources DOT redhat DOT com,
   cygwin AT cygwin DOT com
Subject: Re: [wayne AT cs DOT toronto DOT edu: Cygwin-1.5.5 sscanf on floats: 20 times
 slower than 2 years ago]
References: <03Nov17 DOT 130546edt DOT 453219-16291 AT jane DOT cs DOT toronto DOT edu> <3FBE6D21 DOT 1080305 AT redhat DOT com>
In-Reply-To: <3FBE6D21.1080305@redhat.com>
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J. Johnston wrote:
> 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.
>

Patch checked in.

-- Jeff J.



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