[Bug middle-end/64099] New: [5 Regression] ~15% runtime increase for fatigue.f90.

["dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099

            Bug ID: 64099
           Summary: [5 Regression] ~15% runtime increase for fatigue.f90.
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: hubicka at ucw dot cz, rguenth at gcc dot gnu.org

On x86_64-apple-darwin14, I see a ~15% runtime increase for the polyhedron test
fatigue.f90 on the current trunk (r218134). It is split in two steps. The first
one occurred between r216631 and r216747:

[Book15] lin/test% /opt/gcc/gcc4.10p-216631p3/bin/gfortran -fprotect-parens
-Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program
-flto fatigue.f90
[Book15] lin/test% time a.out > /dev/null
1.373u 0.001s 0:01.37 100.0%    0+0k 0+0io 0pf+0w
[Book15] lin/test% /opt/gcc/gcc4.10p-216747p2/bin/gfortran -fprotect-parens
-Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program
-flto fatigue.f90
[Book15] lin/test% time a.out > /dev/null                                      
                                                                    1.462u
0.002s 0:01.47 99.3%    0+0k 0+1io 40pf+0w

The second one occurred between r217816 and r217833:

[Book15] lin/test% /opt/gcc/gcc4.10p-217816p2/bin/gfortran -fprotect-parens
-Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program
-flto fatigue.f90
[Book15] lin/test% time a.out > /dev/null                                      
                                                                    1.435u
0.002s 0:01.44 99.3%    0+0k 0+2io 41pf+0w
[Book15] lin/test% /opt/gcc/gcc4.10p-217833p1/bin/gfortran -fprotect-parens
-Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -fwhole-program
-flto fatigue.f90
[Book15] lin/test% time a.out > /dev/null                                      
                                                                    1.582u
0.001s 0:01.58 100.0%    0+0k 0+1io 0pf+0w