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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: James Cloos <cloos@...>
Subject: Re: Possible Math Problem - Request For Verification [Solved]
Date: Sun, 26 Jun 2011 07:33:52 -0400
>>>>> "FP" == Frank Peters <frank.peters@...> writes:

FP> All I need now is for someone to come forward and say that he is using
FP> gcc-4.5.2 and has no problem.  Then I'll really start to bang my head.

Using gcc-4.6.0 (compiled with +graphite), using:

      -O3 -ggdb3 -march=amdfam10 -ftree-vectorize

a number of the cabs(3) and cpow(3) tests returned (0,0) (for each of
float and double, and each of c and fortran) instead of the correct results.

The sin and cos tests had max errors in the +- 5 ulp range for doubles
and the +- 1.5 range for floats.

Your obsercation that graphite may be to blame is likely correct.

You may be interested in crlibm (correctly rounded lib m):

    http://lipforge.ens-lyon.fr/projects/crlibm
    http://lipforge.ens-lyon.fr/www/crlibm/

-JimC
-- 
James Cloos <cloos@...>         OpenPGP: 1024D/ED7DAEA6


References:
Possible Math Problem - Request For Verification
-- Frank Peters
Re: Possible Math Problem - Request For Verification [Solved]
-- Frank Peters
Re: Possible Math Problem - Request For Verification [Solved]
-- Mark Knecht
Re: Possible Math Problem - Request For Verification [Solved]
-- Frank Peters
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Updated Jun 28, 2012

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