Re: Recent (middle-end?) regressions in the Fortran testsuite

[Steve Kargl <sgk at troutmask dot apl dot washington dot edu>]

On Tue, Sep 11, 2007 at 03:50:39PM +0100, Fran?ois-Xavier Coudert wrote:
> The last few days have seen a regression in the Fortran testsuite on
> i386-linux and x86_64-linux (filed as PR33391). The following code
> gives wrong results at -O2 while it works at -O1:
> 
>   program test
>     integer(kind=1) :: i
> 
>     do i = -128, 127
>     end do
>     if (i /= -128) call abort
>   end program test
> 
> 
> Also of interest, gfortran.dg/vect/vect-{1,2,4}.f90 have started
> failing on ia64 and i386 (but not x86_64 and i686, apparently).
> 

See the long thread I started at

http://gcc.gnu.org/ml/gcc/2007-09/msg00043.html

According to honza some inlining changes have broken gfortran

http://gcc.gnu.org/ml/gcc/2007-09/msg00044.html

such that the overflowing of the index i is now detected
and disallowed.  I haven't tried to verify nor find the 
exact commit that broke gfortran.  One can supposely add
-fno-strict-overflow, but I think that this is bogus and 
whatever commit is causing the regression should be 
reverted.

-- 
Steve