Richard,
There's a longer optimization list at
http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
Not just the floating point specific flags, but pretty much any
instruction optimization can cause a difference.
The problem is that the floating point registers are 80 bits wide and
the memory storage for double precision floating point is 64 bits.
So, you can have changes to the order in which operations are done that
are "mathematically equivalent" but cause small differences in values
because the 80-bit to 64-bit conversion is done at different points.
Thanks
Bruce
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