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[Bug target/32086] [4.3 Regression] 10% to 20% Performance Regression Between 4.1.3 and 4.3
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Nov 2007 08:09:18 -0000
- Subject: [Bug target/32086] [4.3 Regression] 10% to 20% Performance Regression Between 4.1.3 and 4.3
- References: <bug-32086-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from ubizjak at gmail dot com 2007-11-29 08:09 -------
(In reply to comment #0)
> b) gfortran -m32 -march=opteron -ffast-math -funroll-loops -ftree-vectorize
> -ftree-loop-linear -O3
>
> induct.f90: 61.41 [100%] vs 46.94 [ 76%]
> test2.f90: 5.45 [100%] vs 4.54 [ 83%]
I have run the test compiled with above options, with and without
-fvect-cost-model, but on Xeon 3.2G in 32bit mode:
w/o -fvect-cost-model:
user 1m40.906s
w/ -fvect-cost-model:
user 0m46.439s
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32086