From 5cfb06b61bc559d94f57914826bac2f34abbd357 Mon Sep 17 00:00:00 2001
From: Jan Hubicka <jh@suse.cz>
Date: Tue, 22 Sep 2020 22:36:01 +0200
Subject: [PATCH] Ignore clobbers in modref

	* ipa-modref.c (analyze_stmt): Ignore gimple clobber.
---
 gcc/ipa-modref.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c
index d195354e927..fe277d88a16 100644
--- a/gcc/ipa-modref.c
+++ b/gcc/ipa-modref.c
@@ -552,6 +552,9 @@ analyze_store (gimple *, tree, tree op, void *data)
 static bool
 analyze_stmt (modref_summary *summary, gimple *stmt, bool ipa)
 {
+  /* There is no need to record clobbers.  */
+  if (gimple_clobber_p (stmt))
+    return false;
   /* Analyze all loads and stores in STMT.  */
   walk_stmt_load_store_ops (stmt, summary,
 			    analyze_load, analyze_store);