vect: Unify bbs in loop_vec_info and bb_vec_info

Both derived classes have their own "bbs" field, which have exactly same
purpose of recording all basic blocks inside the corresponding vect region,
while the fields are composed by different data type, one is normal array,
the other is auto_vec. This difference causes some duplicated code even
handling the same stuff, almost in tree-vect-patterns. One refinement is
lifting this field into the base class "vec_info", and reset its value to
the continuous memory area pointed by two old "bbs" in each constructor
of derived classes.

2024-05-16 Feng Xue <fxue@os.amperecomputing.com>

gcc/
	* tree-vect-loop.cc (_loop_vec_info::_loop_vec_info): Move
	initialization of bbs to explicit construction code.  Adjust the
	definition of nbbs.
	(update_epilogue_loop_vinfo): Update nbbs for epilog vinfo.
	* tree-vect-patterns.cc (vect_determine_precisions): Make
	loop_vec_info and bb_vec_info share same code.
	(vect_pattern_recog): Remove duplicated vect_pattern_recog_1 loop.
	* tree-vect-slp.cc (vect_get_and_check_slp_defs): Access to bbs[0]
	via base vec_info class.
	(_bb_vec_info::_bb_vec_info): Initialize bbs and nbbs using data
	fields of input auto_vec<> bbs.
	(vect_slp_region): Use access to nbbs to replace original
	bbs.length().
	(vect_schedule_slp_node): Access to bbs[0] via base vec_info class.
	* tree-vectorizer.cc (vec_info::vec_info): Add initialization of
	bbs and nbbs.
	(vec_info::insert_seq_on_entry): Access to bbs[0] via base vec_info
	class.
	* tree-vectorizer.h (vec_info): Add new fields bbs and nbbs.
	(LOOP_VINFO_NBBS): New macro.
	(BB_VINFO_BBS): Rename BB_VINFO_BB to BB_VINFO_BBS.
	(BB_VINFO_NBBS): New macro.
	(_loop_vec_info): Remove field bbs.
	(_bb_vec_info): Rename field bbs.

1 files changed, 0 insertions, 0 deletions

diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/gcc/tree-vect-loop.c