With powerpc-apple-darwin7.9.0, version 4.3.0 20070223, the polyhedron test 'fatigue.f90' (see http://www.polyhedron.co.uk/pb05/polyhedron_benchmark_suite.html) gives
... Simulation terminated. This sample will never fracture. The imposed stress is below the fatigue limit. See the output file for more information. with optimisation -O1 and above. It worked with 4.3.0 20070217. If I add the line if(coefficient == 1000.0) print *, n, coefficient after line 1428, the code works again. I am attaching two reduced tests. The first one works without optimization, gives Simulation terminated. Spin cycle = 100000 Time (sec) = 2.77778E+01 The maximum number of simulation spin cycles was exceeded. with -O1, and This sample will never fracture. The imposed stress is below the fatigue limit. with -O2. The second test is similar to the previous one but works with -O3 -ffast-math -funroll-loops I have commented several variants which break the code. Of special interest is !4 where if (accumulated_plastic_strain < plastic_strain_threshold) then else is working, but not if (accumulated_plastic_strain >= plastic_strain_threshold) then Note that there is also some problems with the test 'induct.f90' see http://gcc.gnu.org/ml/fortran/2007-02/msg00554.html -- Summary: The polyhedron test 'fatigue.f90' is no longer working. Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: regression AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dominiq at lps dot ens dot fr GCC target triplet: powerpc-apple-darwin7 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30969