[PATCH, middle-end]: Convert pow(x,1.0/3.0) to cbrt(x)

[Uros Bizjak]

Hello!

This patch implements conversion of pow(x,1.0/3.0) to cbrt(x). Patch
is bootstrapped on i686-pc-linux-gnu, regression tested on c,c++ and
fortran.

This patch also fixes enhancement PR middle-end/28252.

2006-07-05  Uros Bizjak  <uros@kss-loka.si>

        * builtins.c (fold_builtin): Fold pow(x,1.0/3.0) as cbrt(x) if
        flag_unsafe_math_optimizations is set.

testsuite:

        * gcc.dg/builtins-8.c: Also check pow(x,1.0/3.0) to cbrt(x)
        transformation.

:ADDPATCH middle-end:

Uros.
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