From: Andrew Pinski <quic_apinski@quicinc.com>
Date: Thu, 3 Oct 2024 02:23:55 +0000 (+0000)
Subject: cfgexpand: Expand comment on when non-var clobbers can show up
X-Git-Tag: basepoints/gcc-16~5477
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6064420ebddede802904a740363047b5403598d1;p=thirdparty%2Fgcc.git

cfgexpand: Expand comment on when non-var clobbers can show up

The comment here is not wrong, just it would be better if mentioning
the C++ front-end instead of just the nested function lowering.

gcc/ChangeLog:

	* cfgexpand.cc (add_scope_conflicts_1): Expand comment
	on when non-var clobbers show up.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
---

diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index f32cf1b20c9..6c1096363af 100644
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -639,8 +639,9 @@ add_scope_conflicts_1 (basic_block bb, bitmap work, bool for_conflict)
 	{
 	  tree lhs = gimple_assign_lhs (stmt);
 	  unsigned *v;
-	  /* Nested function lowering might introduce LHSs
-	     that are COMPONENT_REFs.  */
+	  /* Handle only plain var clobbers.
+	     Nested functions lowering and C++ front-end inserts clobbers
+	     which are not just plain variables.  */
 	  if (!VAR_P (lhs))
 	    continue;
 	  if (DECL_RTL_IF_SET (lhs) == pc_rtx