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From: "markus at trippelsdorf dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug math/14412] New: Removal of sysdeps/x86_64/fpu/s_sincos.S causes pdf rendering time regression
Date: Thu, 26 Jul 2012 21:08:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=14412

             Bug #: 14412
           Summary: Removal of sysdeps/x86_64/fpu/s_sincos.S causes pdf
                    rendering time regression
           Product: glibc
           Version: 2.16
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: markus@trippelsdorf.de
    Classification: Unclassified


The removal of sysdeps/x86_64/fpu/s_sincos.S more than doubles
the time it takes to render a particular pdf testpage with Okular.

commit b35fe25ed9b3b406754fe681b1785f330d9faf62
Author: Andreas Jaeger <aj@suse.de>
Date:   Wed Mar 7 14:51:39 2012 +0100

        [BZ #13658]
        * sysdeps/x86_64/fpu/s_sincos.S: Delete.
        * math/libm-test.inc (sincos_test): Add test for large input.

See the following poppler bug:
https://bugs.freedesktop.org/show_bug.cgi?id=52551

With glibc-2.16 it takes ~1 minute to open that page:

# Overhead  Command  Shared Object            Symbol
    35.90%   okular  libm-2.16.so             [.] feraiseexcept
    12.30%   okular  libm-2.16.so             [.] __sin
     9.03%   okular  libm-2.16.so             [.] __cos
     5.01%   okular  libpoppler.so.26.0.0     [.] void
std::__introsort_loop<SplashIntersect*, long,
cmpIntersectFunctor>(SplashIntersect*, SplashInt
ersect*, long, cmpIntersectFunctor)
     2.80%   okular  libpoppler.so.26.0.0     [.]
SplashXPathScanner::computeIntersections()

Before commit b35fe25ed9b3b40 it only takes 24 seconds:

# Overhead  Command  Shared Object            Symbol
    24.09%       okular  libm.so                  [.] __sincos
    10.42%       okular  libpoppler.so.26.0.0     [.] SplashIntersect*
std::__unguarded_partition<SplashIntersect*, SplashIntersect, cmpIntersectFunc
tor>(SplashIntersect*, SplashIntersect*, SplashIntersect const&,
cmpIntersectFunctor)
     5.73%       okular  libpoppler.so.26.0.0     [.]
SplashXPathScanner::computeIntersections()

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