[PATCH] tree-optimization/97081 - fix wrong-code with vectorized shift

[Jakub Jelinek]

On Fri, Sep 18, 2020 at 01:39:16PM +0200, Richard Biener wrote:
> This corrects the mask for creation of x << s | x >> (-x & mask)
> from a rotate x <<r s to use the precision of x.
> 
> Bootstrap / regtest running on x86_64-unknown-linux-gnu.
> 
> 2020-09-18  Richard Biener  <rguenther@suse.de>
> 
> 	PR tree-optimization/97081
> 	* tree-vect-patterns.c (vect_recog_rotate_pattern): Use the
> 	precision of the shifted operand to determine the mask.
> 
> 	* gcc.dg/vect/pr97081.c: New testcase.

LGTM, thanks.  Please make sure to backport it down up to 8.x.

	Jakub