[gcc r10-10763] rtl-optimization/105559 - avoid quadratic behavior in delete_insn_and_edges

[gcc r10-10763] rtl-optimization/105559 - avoid quadratic behavior in delete_insn_and_edges

[Richard Biener]

https://gcc.gnu.org/g:6007449a1c3bd116e431fe53d4dfe2d1c67c1076

commit r10-10763-g6007449a1c3bd116e431fe53d4dfe2d1c67c1076
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 11 13:34:37 2022 +0200

    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.c (delete_insn_and_edges): Only perform search to BB_END
            for non-debug insns.
    
    (cherry picked from commit 37a8220fa9188470c677abfef50c1b120c0b6c76)

Diff:
---
 gcc/cfgrtl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
index 33012ed06b6..9409c5b073f 100644
--- a/gcc/cfgrtl.c
+++ b/gcc/cfgrtl.c
@@ -230,7 +230,7 @@ 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)