http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47298
Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> changed:
What |Removed |Added
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Last reconfirmed| |2012-06-29
--- Comment #4 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch>
2012-06-29 14:44:05 UTC ---
on 4.8 this still is not handled optimally. I get
4.3s for: gfortran -O2 -funroll-loops -ftree-vectorize -ffast-math
-march=native
6.7s for: gfortran -O3 -funroll-loops -ftree-vectorize -ffast-math
-march=native
so more than 50% slowdown going from -O2 to -O3
on
-march=corei7 -mcx16 -msahf -mno-movbe -mno-aes -mno-pclmul -mpopcnt -mno-abm
-mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx
-mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rtm -mno-hle -mno-rdrnd -mno-f16c
-mno-fsgsbase --param l1-cache-size=32 --param l1-cache-line-size=64
