Refactor loop_version

loop_version currently does lv_adjust_loop_entry_edge
before it loopifys the copy inserted on the header.  This patch moves
the condition generation later and thus we have four pieces to help
understanding of how the adjustment works:
 1) duplicating the loop on the entry edge.
 2) loopify the duplicated new loop.
 3) adjusting the CFG to insert a condition branching to either loop
 with lv_adjust_loop_entry_edge.
 4) From loopify extract the scale_loop_frequencies bits.

Also removed some piece of code seems obviously useless:
 - redirect_all_edges since it is false and loopify only called once.
 - extract_cond_bb_edges and lv_flush_pending_stmts (false_edge) as the
 edge is not redirected actually.

gcc/ChangeLog:

2021-11-01  Xionghu Luo  <luoxhu@linux.ibm.com>

	* cfgloopmanip.c (loop_version): Refactor loopify to
	loop_version.  Move condition generation after loopify.
	(loopify): Delete.
	* cfgloopmanip.h (loopify): Delete.

0 files changed, 0 insertions, 0 deletions