re PR rtl-optimization/59278 (combine does not replace matched insn)

testsuite/
	PR rtl-optimization/59278
	* gcc.target/sh/pr59278.c: New.

From-SVN: r218251

gcc/testsuite/ChangeLog

+2014-12-01  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR rtl-optimization/59278
+	* gcc.target/sh/pr59278.c: New.
+
 2014-12-01  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/60859

gcc/testsuite/gcc.target/sh/pr59278.c

+/* Check that combine considers unused regs dead.  */
+/* { dg-do compile }  */
+/* { dg-options "-O1" }  */
+/* { dg-skip-if "" { "sh*-*-*" } { "-m5*"} { "" } }  */
+/* { dg-final { scan-assembler "addc" } }  */
+
+struct result
+{
+  int a, b;
+};
+
+struct result
+test_00 (int a, int b, int d)
+{
+  struct result r;
+  r.a = a != b;
+  r.b = d + b + 1;
+  return r;
+}