Re: [PATCH] Perform constant folding of math builtins

[Paul Koning <pkoning at equallogic dot com>]

>>>>> "Kaveh" == Kaveh R Ghazi <ghazi@caip.rutgers.edu> writes:

 >> From: Roger Sayle
 >> The second is that these values need to be calculated in the
 >> precision required for the target, so shouldn't use the host
 >> functions anyway.

 Kaveh> Why not?  Aren't we talking about "unsafe" math opts?

The description of that option isn't clear.  But I would read it to
allow things like optimizations that make the rounding be different,
or the LSB of the result.  I wouldn't expect it to mean "you can do
the operation in a precision different from what I asked".  In other
words, I wouldn't expect the compiler to replace, say, a sqrt of a
double argument by a sqrt of a float argument.

Doing constant folding with the host float library could be just as
drastic.

	paul