GCC 4.5 Optimization Problem

[Quant]

I have recently upgrade my Ubuntu from 10.10 to 11.04. GCC version is also
upgraded from 4.4 to 4.5 automatically. However, some of my heavy math. C
codes run slower when compiled with GCC 4.5.
I have tried various optimization flags including "-fexcess-precision=fast".
But nothing changes, it runs slower comparing to the executable compiled
with GCC 4.4.

By the way, I complied them with GCC 4.4 with "-03 -ffast-math". My machine
is IMAC I7. Ubuntu is 64bit.

Any idea?
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