why not consfold sin(const)

[Luchezar Belev]

Hi all,

when compiling with -ffast-math, gcc replaces sin(0) with 0, but does not const fold sin of any
other const.
Is there some problem with that in principle (like that would not be correct code in some
circumstances)
or it's just not implemented?
This is also true for other builtin math funcs like log() (gcc only optimizes log(1) to 0),
but it is not the case with sqrt() - in that case the compiler always constfolds and eliminates
the
expensive and redundant sqrt operation.

Lucho



		
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