--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/20050503-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,50 @@
+/* PR middle-end/21265
+   Test whether tail call information is propagated through builtin
+   expanders.  */
+/* { dg-do compile } */
+/* { dg-skip-if "" { { i?86-*-* x86_64-*-* } && { ia32 && { ! nonpic } } } } */
+/* { dg-options "-O2" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+#define F(n, rettype, name, args, callargs) \
+extern rettype name args;				\
+rettype test##n args					\
+{							\
+  return name callargs;					\
+}
+#define F1(n, rettype, name, t1, callargs) \
+  F (n, rettype, name, (t1 a1), callargs)
+#define F2(n, rettype, name, t1, t2, callargs) \
+  F (n, rettype, name, (t1 a1, t2 a2), callargs)
+#define F3(n, rettype, name, t1, t2, t3, callargs) \
+  F (n, rettype, name, (t1 a1, t2 a2, t3 a3), callargs)
+
+F3 (1a, void *, memcpy, void *, const void *, size_t, (a1, a2, a3))
+F3 (1b, void *, memcpy, void *, const void *, size_t, (a1, a2, 10))
+F3 (2a, void *, mempcpy, void *, const void *, size_t, (a1, a2, a3))
+F3 (2b, void *, mempcpy, void *, const void *, size_t, (a1, a2, 10))
+F3 (3a, void *, memmove, void *, const void *, size_t, (a1, a2, a3))
+F3 (3b, void *, memmove, void *, const void *, size_t, (a1, "abcdefghijklmno", a3))
+F3 (4a, void *, memset, void *, int, size_t, (a1, a2, a3))
+F3 (4b, void *, memset, void *, int, size_t, (a1, a2, 156))
+F3 (4c, void *, memset, void *, int, size_t, (a1, 0, a3))
+F3 (4d, void *, memset, void *, int, size_t, (a1, 0, 10000))
+F3 (5a, int, memcmp, const void *, const void *, size_t, (a1, a2, a3))
+F3 (5b, int, memcmp, const void *, const void *, size_t, (a1, "abcdefghijkl", a3))
+F2 (6, char *, strcpy, char *, const char *, (a1, a2))
+F2 (7, char *, stpcpy, char *, const char *, (a1, a2))
+F3 (8, char *, strncpy, char *, const char *, size_t, (a1, a2, a3))
+F3 (9, char *, stpncpy, char *, const char *, size_t, (a1, a2, a3))
+F2 (10, char *, strcat, char *, const char *, (a1, a2))
+F3 (11, char *, strncat, char *, const char *, size_t, (a1, a2, a3))
+F1 (12a, size_t, strlen, const char *, (a1))
+F1 (12b, size_t, strlen, const char *, ("foobar"))
+F2 (13a, int, strcmp, const char *, const char *, (a1, a2))
+F2 (13b, int, strcmp, const char *, const char *, (a1, "abcdefghijklm"))
+F3 (14a, int, strncmp, const char *, const char *, size_t, (a1, a2, a3))
+F3 (14b, int, strncmp, const char *, const char *, size_t, (a1, "abcdefghijklm", 10))
+F2 (15, char *, strchr, const char *, int, (a1, a2))
+
+/* All the calls above should be tail call optimized on i?86/x86-64.  */
+/* { dg-final { scan-assembler-not "call" { target i?86-*-linux* i?86-*-gnu* x86_64-*-linux* } } } */