tree-vect-loop.c (vect_analyze_loop_operations): Also call vectorizable_reduction...

tree-vect-loop.c (vect_analyze_loop_operations): Also call vectorizable_reduction for vect_double_reduction_def.

2019-09-26  Richard Biener  <rguenther@suse.de>

	* tree-vect-loop.c (vect_analyze_loop_operations): Also call
	vectorizable_reduction for vect_double_reduction_def.
	(vect_transform_loop): Likewise.
	(vect_create_epilog_for_reduction): Move double-reduction
	PHI creation and preheader argument setting of PHIs ...
	(vectorizable_reduction): ... here.  Also process
	vect_double_reduction_def PHIs, creating the vectorized
	PHI nodes, remembering the scalar adjustment computed for
	the epilogue in STMT_VINFO_REDUC_EPILOGUE_ADJUSTMENT.
	Remember the original reduction code in STMT_VINFO_REDUC_CODE.
	* tree-vectorizer.c (vec_info::new_stmt_vec_info):
	Initialize STMT_VINFO_REDUC_CODE.
	* tree-vectorizer.h (_stmt_vec_info::reduc_epilogue_adjustment): New.
	(_stmt_vec_info::reduc_code): Likewise.
	(STMT_VINFO_REDUC_EPILOGUE_ADJUSTMENT): Likewise.
	(STMT_VINFO_REDUC_CODE): Likewise.

From-SVN: r276150