Optimizing calls to GSL functions

[Tommy Nordgren]

Are there any way, when using the GNU Compiler Collection, to make  
the compiler
optimize expressions where the same function call occurs more than once.
(Same function, same parameters)
GCC does this for standard C functions such as cos and sin, when passed
-O3 or -Os -fgcse
I'm interested in this, because most special functions computed by GSL
are probably more expensive to compute than the basic transcendental  
functions,
and in general you can get many common subexpressions when generating C
code from symbol math programs.
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"Home is not where you are born, but where your heart finds peace" -
Tommy Nordgren, "The dying old crone"
tommy.nordgren@comhem.se