[Bug fortran/20945] about 2x perfomance regression in comparision with 3.4.2

[fxcoudert at gcc dot gnu dot org]

------- Additional Comments From fxcoudert at gcc dot gnu dot org  2005-06-19 07:34 -------
On Pentium III (Coppermine), 864 MHz, 256 KB cache, with linux. Timing in seconds:

g77: 9.52s
gfortran: 9.49s
g77 -O2: 3.11s
gfortran -O2: 3.39s
g77 -O3 -ffast-math: 3.09s
gfortran -O3 -ffast-math: 3.37s

So, I can't confirm your timings. You should perhaps use longer loops (since
your timings are less than a second, you could see the effect of something
external to the floating-point performance itself).

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20945