Re: [Bug-gsl] 'make check' failes with Intel Compiler 10

[Brian Gough]

At Thu, 3 Apr 2008 11:33:00 +0200,
Stefan Gerlach wrote:
> compiling gsl-1.11 on openSUSE 10.2 (x86_64) with Intel C Compiler 10 i get 
> the following problems during make check :
> 
> ...
> FAIL: gsl_sf_angle_restrict_symm_err_e(-1e9, &r) [2769]
>   expected: -5.7739542350138517e-01
>   obtained: -5.7739543914794922e-01 +/- 4.4408920959364753e-07 
> (rel=7.69124e-07)
>   fracdiff: 1.3549262078941325e-08
>  tolerance: 3.5527136788005009e-15
>   value not within tolerance of expected value
>    -5.773954391479492188e-01  4.440892095936475318e-07
> FAIL:   gsl_angle_restrict_pos_e: theta = 50000.0 + 1.0/65536.0 [2775]
> FAIL:   gsl_angle_restrict_pos_e: theta = 5000000.0 + 1.0/65536.0 [2776]
> FAIL:   gsl_angle_restrict_symm_e: theta = 50000.0 + 1.0/65536.0 [2782]
> FAIL: Trigonometric and Related Functions [2783]
> FAIL: test
> ===================
> 1 of 1 tests failed
> ===================
> 
> this is the last of a long list of failed tests in specfunc/

Thanks for your email.  

Most likely many of the failures are errors just above the test limit.

In test_sf.h you'll find two factors

   #define TEST_FACTOR 100.0  
   #define TEST_SIGMA 1.5  

If you increase these you may find that some of the errors go away.

In the example above, it looks like the formula in
gsl_sf_angle_restrict_symm_err_e has broken down and caused a loss of
precision.  That could be a problem with the compiler.  If you used
optimisation you could try compiling without optimisation.  As icc is
proprietary software I don't run any tests with it myself, only gcc.

-- 
Brian Gough

Network Theory Ltd,
Publishing Free Software Manuals --- http://www.network-theory.co.uk/