On 5/5/2011 2:16 PM, Quant wrote:
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?
Surely, no idea why you are using 32-bit gcc with 387 code (must be so,
if you have excess-precision) if you are on 64-bit OS.
With no idea of what you mean by "heavy math," (an example would go a
long way), no relevant ideas are likely to appear.
--
Tim Prince
