diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5fe196602dd2..1cd5ce6cfc82 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-11-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/46461
+	* tree-ssa-forwprop.c (simplify_builtin_call): Ensure ptr1 is
+	a gimple val.
+
 2010-11-15  Ian Lance Taylor  <iant@google.com>
 
 	* godump.c: New file.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 41eb290a82e8..aeaf08b5d0ac 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/46461
+	* gcc.c-torture/compile/pr46461.c: New test.
+
 2010-11-15  Tobias Burnus  <burnus@net.b.de>
 
 	PR fortran/46484
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr46461.c b/gcc/testsuite/gcc.c-torture/compile/pr46461.c
new file mode 100644
index 000000000000..7e38598e169e
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr46461.c
@@ -0,0 +1,8 @@
+/* PR tree-optimization/46461 */
+
+void
+foo (char *c)
+{
+  c[7] = 0xff;
+  __builtin_memset (c + 8, 0xff, 8);
+}
diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c
index 7e7e2b152ee2..f68395a57c9a 100644
--- a/gcc/tree-ssa-forwprop.c
+++ b/gcc/tree-ssa-forwprop.c
@@ -1594,6 +1594,9 @@ simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2)
 		 memcpy call.  */
 	      gimple_stmt_iterator gsi = gsi_for_stmt (stmt1);
 
+	      if (!is_gimple_val (ptr1))
+		ptr1 = force_gimple_operand_gsi (gsi_p, ptr1, true, NULL_TREE,
+						 true, GSI_SAME_STMT);
 	      gimple_call_set_fndecl (stmt2, built_in_decls [BUILT_IN_MEMCPY]);
 	      gimple_call_set_arg (stmt2, 0, ptr1);
 	      gimple_call_set_arg (stmt2, 1, new_str_cst);