From: H.J. Lu <hjl.tools@gmail.com>
Date: Thu, 29 Apr 2021 18:12:09 +0000 (-0700)
Subject: Don't use nullptr return from simplify_gen_subreg
X-Git-Tag: basepoints/gcc-13~8000
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86c77c52f7b812adccf9620860f7c392f9a16cfc;p=thirdparty%2Fgcc.git

Don't use nullptr return from simplify_gen_subreg

Check nullptr return from simplify_gen_subreg.  Don't use it if it is
nullptr.

	PR middle-end/90773
	* builtins.c (builtin_memset_gen_str): Don't use return from
	simplify_gen_subreg.
---

diff --git a/gcc/builtins.c b/gcc/builtins.c
index 2d6bf4a65b4d..4613aecfe6eb 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -6628,7 +6628,9 @@ builtin_memset_gen_str (void *data, void *prevp,
       if (prev->mode == mode)
 	return prev->data;
 
-      return simplify_gen_subreg (mode, prev->data, prev->mode, 0);
+      target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
+      if (target != nullptr)
+	return target;
     }
 
   size = GET_MODE_SIZE (mode);