S/390: Add emit_barrier() after trap

gcc/ChangeLog

	* config/s390/s390.c (s390_emit_prologue): Add emit_barrier() after
	trap to fix ICE.

gcc/testsuite/ChangeLog

	* gcc.target/s390/20150826-1.c: New test.

From-SVN: r227251

gcc/ChangeLog

+2015-08-27  Dominik Vogt  <vogt@linux.vnet.ibm.com>
+
+	* config/s390/s390.c (s390_emit_prologue): Add emit_barrier() after
+	trap to fix ICE.
+
 2015-08-26  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000-protos.h (rs6000_expand_float128_convert):

gcc/config/s390/s390.c

@@ -10351,6 +10351,7 @@ s390_emit_prologue (void)
 		       current_function_name(), cfun_frame_layout.frame_size,
 		       s390_stack_size);
 	      emit_insn (gen_trap ());
+	      emit_barrier ();
 	    }
 	  else
 	    {

gcc/testsuite/ChangeLog

+2015-08-27  Dominik Vogt  <vogt@linux.vnet.ibm.com>
+
+	* gcc.target/s390/20150826-1.c: New test.
+
 2015-08-26  Renlin Li  <renlin.li@arm.com>
 
 	* gcc.target/aarch64/combine_bfi_1.c: New testcase.

gcc/testsuite/gcc.target/s390/20150826-1.c

+/* Check that emitting a dynamic stack check for sizes below the
+   current frame size work.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O3 -mstack-size=32" } */
+
+extern int bar(char *);
+int foo(void)
+{
+  char b[100];
+  return bar(b);
+} /* { dg-warning "An unconditional trap is added" } */