Updated info about the builds. The following setting were used for those last numbers.

gcc 4.5.2
CFLAGS="-O2 -march=native -pipe -fgraphite-identity -floop-interchange -floop-strip-mine -floop-block -ffast-math"
--disable-asm

ekopath 4.0.10 (binary)
CFLAGS="-O3 -ffast-math -pipe"
--disable-asm