https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81839
Bug ID: 81839
Summary: [7/8 Regression] doduc.f90 undefined behavior warning
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: tkoenig at gcc dot gnu.org
Target Milestone: ---
Compiling doduc.f90 from the pb11 benchmark suite results in the
warning
$ gfortran -O -Waggressive-loop-optimizations doduc.f90
doduc.f90:3587:0:
QUGii(ij) = 0.
Warning: iteration 2 invokes undefined behavior
[-Waggressive-loop-optimizations]
doduc.f90:3586:0:
DO ij = 1 , 3
note: within this loop
The loop itself looks innocent enough:
ELSE
DO ij = 1 , 3
QUGii(ij) = 0.
QCOni(ij) = 0.
ENDDO
GOTO 600
