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[Bug tree-optimization/25621] Missed optimization when unrolling the loop (splitting up the sum) (only with -ffast-math)
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 5 Dec 2008 16:25:39 -0000
- Subject: [Bug tree-optimization/25621] Missed optimization when unrolling the loop (splitting up the sum) (only with -ffast-math)
- References: <bug-25621-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #10 from jv244 at cam dot ac dot uk 2008-12-05 16:25 -------
Timings in 4.4 are essentially unchanged
gfortran -O3 -ffast-math -march=native PR25621.f90:
default loop 1.2920810000000000
hand optimized loop 0.86405399999999988
fun enough inverse timings with a recent intel compiler:
default loop 0.440028000000000
hand optimized loop 1.26007800000000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25621