From 0bda748154140ad074430310be676a8878949658 Mon Sep 17 00:00:00 2001
From: Richard Lowe <richlowe@richlowe.net>
Date: Tue, 4 Mar 2014 02:58:33 +0000
Subject: strict-cc2: check that disabling function cloning
 prevents constant propagation eliding or changing arguments

---
 .../gcc.dg/fno-clone-preserves-unused-args.c  | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/fno-clone-preserves-unused-args.c

diff --git a/gcc/testsuite/gcc.dg/fno-clone-preserves-unused-args.c b/gcc/testsuite/gcc.dg/fno-clone-preserves-unused-args.c
new file mode 100644
index 000000000000..0955381c8480
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/fno-clone-preserves-unused-args.c
@@ -0,0 +1,28 @@
+/* { dg-do compile { target { ilp32 } } } */
+/* { dg-options "-O2 -funit-at-a-time -fipa-sra -fno-clone-functions"  } */
+/* { dg-final { scan-assembler "pushl.*\\\$1" } } */
+/* { dg-final { scan-assembler "pushl.*\\\$2" } } */
+/* { dg-final { scan-assembler "pushl.*\\\$3" } } */
+/* { dg-final { scan-assembler "pushl.*\\\$4" } } */
+/* { dg-final { scan-assembler "pushl.*\\\$5" } } */
+
+#include <stdio.h>
+
+/*
+ * Verify that preventing function cloning prevents constant prop/scalar
+ * reduction removing parameters
+ */
+static void
+t(int, int, int, int, int) __attribute__ ((noinline));
+
+int foo()
+{
+    t(1, 2, 3, 4, 5);
+}
+
+/* Only use 3 params, bait constprop/sra into deleting the other two */
+static void
+t(int a, int b, int c, int d, int e)
+{
+    printf("%d %d\n", a, b, c);
+}