https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79744
Bug ID: 79744
Summary: [7 Regression] The polyhedron test rnflow.f90 is
miscompiled with -O3 after r236361
Product: gcc
Version: 7.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: dominiq at lps dot ens.fr
CC: rguenth at gcc dot gnu.org
Target Milestone: ---
When compiled with gfortran 6.3.0 (or trunk up to r236319) and -O3, the
polyhedron test rnflow.f90 gives the output
...
173 , 181 194373 193363 0.519999981
173 , 189 78369 78008 0.460000008
173 , 197 19089 18777 1.63000000
181 , 189 81645 81532 0.140000001
181 , 197 29924 29571 1.17999995
189 , 197 32866 33059 0.579999983
189 , 205 12258 12352 0.759999990
197 , 205 10923 10786 1.25000000
205 , 213 3278 3208 2.14000010
0: 0:17.492 -> Completed program execution
After revision r236361 (pr71168)
...
165 , 197 9830 9748 0.829999983
165 , 205 1529 1461 4.44999981
173 , 181 194373 194038 0.170000002
173 , 189 78369 78584 0.270000011
173 , 197 19089 19180 0.469999999
181 , 189 81645 81303 0.419999987
181 , 197 29924 30302 1.25000000
189 , 205 12258 12546 2.29999995
197 , 213 2790 2698 3.29999995
0: 0:22.058 -> Completed program execution
Note also that the execution time increases by ~30%.
