On Tue, 7 May 2013, Marc Glisse wrote:
* fold-const.c (operand_equal_p): Use element_precision.
(fold_binary_loc): Handle vector types.
Note that this causes a regression in some cases: it now recognizes
LROTATE_EXPR for vectors, but then on x86_64 it isn't a supported vector
operation so it is lowered to scalar rotations, which is worse than the
shift+shift+or that we started with. But it only means that the vector
lowering is bad, not that the patch is wrong. I didn't check if the
vectorizer was clever enough to split rotations into shifts+or when
that helps.
--
Marc Glisse
