[Bug fortran/29317] gfortran.dg/exponent_1.f90 failure

[sgk at troutmask dot apl dot washington dot edu]

------- Comment #1 from sgk at troutmask dot apl dot washington dot edu  2006-10-02 14:22 -------
Subject: Re:   New: gfortran.dg/exponent_1.f90 failure

On Mon, Oct 02, 2006 at 09:32:55AM -0000, fxcoudert at gcc dot gnu dot org
wrote:
> gfortran.dg/exponent_1.f90 is failing at all optimization levels on
> x86_64-linux (see http://gcc.gnu.org/ml/gcc-testresults/2006-10/msg00081.html).
> Here is the problem:
> 
> $ cat exponent_1.f90 
>   real, parameter :: one = 1.0
>   print *, exponent(one)
>   if (exponent(one) /= 1.0) call abort
>   end

What version of mpfr do you have?  This test will
fail if the version is not 2.2.0 or newer.

If you have a good mpfr, then the problem may be
similar to the one with nearest_1.f90 where the extra 
precision in the registers is bad (ie., add -ffloat-store
to the test).

One other possibility is the problem with subnormal 
numbers is also affecting this test.  I hope to look
into the subnormal issue later today.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29317