rtl-optimization/105559 - avoid quadratic behavior in delete_insn_and_edges

When the insn to delete is a debug insn there's no point in figuring
out whether it might be the last real insn and thus we have to purge
dead edges.

2022-05-11  Richard Biener  <rguenther@suse.de>

	PR rtl-optimization/105559
	* cfgrtl.cc (delete_insn_and_edges): Only perform search to BB_END
	for non-debug insns.

(cherry picked from commit 37a8220fa9188470c677abfef50c1b120c0b6c76)

diff --git a/gcc/cfgrtl.cc b/gcc/cfgrtl.cc
index 74ea14e..06be46d 100644 (file)
--- a/gcc/cfgrtl.cc
+++ b/gcc/cfgrtl.cc
@@ -235,7 +235,7 @@ delete_insn_and_edges (rtx_insn *insn)
 {
   bool purge = false;
 
-  if (INSN_P (insn) && BLOCK_FOR_INSN (insn))
+  if (NONDEBUG_INSN_P (insn) && BLOCK_FOR_INSN (insn))
     {
       basic_block bb = BLOCK_FOR_INSN (insn);
       if (BB_END (bb) == insn)