[patch] altivec.md bitwise operations support

[Olga Golovanevsky]

Similarly to the patch that was committed to the lno branch (
http://gcc.gnu.org/ml/gcc-patches/2004-03/msg00769.html), this patch adds
modelling of one's complement to altivec.md, as well as modelling of
bitwise-and & bitwise-or for additional
data types (previously modelled only for V4SI).

Bootstrapped and passed regression tests on powerpc-apple-darwin7.0.0.

ok for mainline?


thanks,
Dorit, Olga

      * config/rs6000/altivec.md: (andvv16qi3, andv8hi3, one_cmplv16qi2,
        one_cmplv8hi2, one_cmplv4si2, iorv16qi3, iorv8hi3,): New modelling.

      (See attached file: altivec_bitwise_patch)
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