[Bug fortran/56872] [4.8/4.9 Regression] Incorrect SUM evaluation, involving implied-do loop, with -ffrontend-optimize

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56872



--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> 2013-04-08 
16:39:10 UTC ---

Front-end optimization generates for

  print *,SUM([(s**(REAL(k-1)/REAL(m-1)),k=1,m)])

the code:

   D.1918 = s;

   D.1919 = __builtin_powf (D.1918, (((real(kind=4)) (k + -1) / (real(kind=4))

(m + -1))));



Completely ignoring that "k" is a loop variable, which is not even set.