Fix possible wrong-code with masked store-lanes

When we're doing masked store-lanes one mask element applies to all
loads of one struct element.  This requires uniform masks for all
of the SLP lanes, something we already compute into STMT_VINFO_SLP_VECT_ONLY
but fail to check when doing SLP store-lanes.  The following corrects
this.  The following also adjusts the store-lane heuristic to properly
check for masked or non-masked optab support.

	* tree-vect-slp.cc (vect_slp_prefer_store_lanes_p): Allow
	passing in of vectype, pass in whether the stores are masked
	and query the correct optab.
	(vect_build_slp_instance): Guard store-lanes query with
	! STMT_VINFO_SLP_VECT_ONLY, guaranteeing an uniform mask.

0 files changed, 0 insertions, 0 deletions