http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41115
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |burnus at gcc dot gnu.org
--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> 2013-03-28
23:08:00 UTC ---
(In reply to comment #3)
> It would be nice to see where we are today with respect to the cost model /
> vectorizing / not vectorizing.
Answer: It became much worse (compared to GCC 4.5 of comment 0):
Using gcc version 4.8.0 20130308 [trunk revision 196547], the induct runtimes
are:
gfortran -march=native -ffast-math -O3 -ftree-vectorize -fvect-cost-model
induct.f90
real 0m47.142s / user 0m47.072s / sys 0m0.020s
gfortran-4.8 -march=native -ffast-math -O3 -ftree-vectorize
-fno-vect-cost-model induct.f90
real 0m35.713s / user 0m35.236s / sys 0m0.052s
time gfortran-4.8 -march=native -ffast-math -O3 -fno-tree-vectorize induct.f90
real 0m47.837s / user 0m47.388s / sys 0m0.028s
real 0m47.514s / user 0m47.428s / sys 0m0.044s
gfortran -march=opteron -ffast-math -funroll-loops -fno-tree-vectorize
-ftree-loop-linear -msse3 -O3 induct.f90
real 0m44.676s / user 0m44.640s / sys 0m0.032s
gfortran-4.5 -march=opteron -ffast-math -funroll-loops -fno-tree-vectorize
-ftree-loop-linear -msse3 -O3 induct.f90; time ./a.out
real 0m34.591s / user 0m34.524s / sys 0m0.020s
