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[Bug rtl-optimization/32084] gfortran 4.3 13%-18% slower for induct.f90 than gcc 4.0-based competitor
- From: "burnus at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Jun 2007 12:03:06 -0000
- Subject: [Bug rtl-optimization/32084] gfortran 4.3 13%-18% slower for induct.f90 than gcc 4.0-based competitor
- References: <bug-32084-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from burnus at gcc dot gnu dot org 2007-06-28 12:03 -------
core2 AMD
0m45.215s 0m4.312s (no vectorize)
1m34.046s 0m4.668s -ftree-vectorize
0m45.447s 0m4.300s -ftree-vectorize -fvect-cost-model
i.e. "-ftree-vectorize -fvect-cost-model" is marginally faster than without
-ftree-vectorize on AMD but slower on Intel; and on Intel "-ftree-vectorize"
alone has a huge impact (80% slower) whereas on AMD only it is only 8% slower.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32084