[Bug middle-end/44329] New: vectorization loss in gas_dyn

[howarth at nitro dot med dot uc dot edu]

Currently gcc trunk is showing significant loss of vectorization at r160038 for
the gas_dyn.f90 benchmark...

bash-3.2$ gfortran -O3 -ffast-math -ftree-vectorizer-verbose=2 gas_dyn.f90 &>
gcc46.txt
bash-3.2$ grep "LOOP VECTORIZED" gcc46.txt | wc
      29     116    1177

compared to...

bash-3.2$ gfortran -O3 -ffast-math -ftree-vectorizer-verbose=2 gas_dyn.f90 &>
gcc46.txt
bash-3.2$ grep "LOOP VECTORIZED" gcc46.txt | wc
      41     164    1666

at r159941.


-- 
           Summary: vectorization loss in gas_dyn
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: howarth at nitro dot med dot uc dot edu
 GCC build triplet: x86_64-apple-darwin10
  GCC host triplet: x86_64-apple-darwin10
GCC target triplet: x86_64-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44329