[patch, testsuite] new test for arm epilogue

[Greta Yorsh]

This test relies on epilogue generated in RTL to provide register liveness
information that enables peephole optimization.

OK for trunk?

Thanks,
Greta


2012-06-18  Joey Ye <joey...@arm.com>
            Greta Yorsh  <greta.yo...@arm.com>

         * gcc.target/arm/epilog-1.c: New test.

diff --git a/gcc/testsuite/gcc.target/arm/epilog-1.c 
b/gcc/testsuite/gcc.target/arm/epilog-1.c
new file mode 100644
index 0000000..f97f1eb
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/epilog-1.c
@@ -0,0 +1,17 @@
+/* Register liveness information from epilgoue enables peephole optimization. 
*/
+/* { dg-do compile } */
+/* { dg-options "-mthumb -Os" } */
+/* { dg-require-effective-target arm_thumb2_ok } */
+
+volatile int g_k;
+extern void bar(int, int, int, int);
+
+int foo(int a, int b, int c, int d)
+{
+  if (g_k & 4) c++;
+  bar (a, b, c, d);
+  return 0;
+}
+
+/* { dg-final { scan-assembler-times "lsls.*#29" 1 } } */
+/* { dg-final { scan-assembler-not "tst" } } */