S/390: PR79893: Add diagnostics vec_load_bndry builtin.

The boundary argument of the vec_load_bndry builtin needs to be
rewritten.  At that point it must be constant already.  The current
diagnostics in s390_expand_builtins is too late for this.  The patch
adds an additional check for that builtin which will be triggered
already during preprocessing.

Regression tested on s390x.

gcc/testsuite/ChangeLog:

2017-03-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR target/79893
	* gcc.target/s390/zvector/pr79893.c: New test.

gcc/ChangeLog:

2017-03-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	PR target/79893
	* config/s390/s390-c.c (s390_adjust_builtin_arglist): Issue an
	error if the boundary argument is not constant.

From-SVN: r246442

gcc/ChangeLog

+2017-03-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	PR target/79893
+	* config/s390/s390-c.c (s390_adjust_builtin_arglist): Issue an
+	error if the boundary argument is not constant.
+
 2017-03-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/80112

gcc/config/s390/s390-c.c

@@ -673,10 +673,18 @@ s390_adjust_builtin_arglist (unsigned int ob_fcode, tree decl,
 	case S390_OVERLOADED_BUILTIN_s390_vec_load_bndry:
 	  {
 	    int code;
-
 	    if (dest_arg_index == 1)
 	      {
-		switch (tree_to_uhwi ((**arglist)[src_arg_index]))
+		tree arg = (**arglist)[src_arg_index];
+
+		if (TREE_CODE (arg) != INTEGER_CST)
+		  {
+		    error ("constant value required for builtin %qF argument %d",
+			   decl, src_arg_index + 1);
+		    return;
+		  }
+
+		switch (tree_to_uhwi (arg))
 		  {
 		  case 64: code = 0; break;
 		  case 128: code = 1; break;

gcc/testsuite/ChangeLog

+2017-03-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>
+
+	PR target/79893
+	* gcc.target/s390/zvector/pr79893.c: New test.
+
 2017-03-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/80112

gcc/testsuite/gcc.target/s390/zvector/pr79893.c

+/* { dg-do compile { target { s390*-*-* } } } */
+/* { dg-options "-march=z13 -mzarch -mzvector" } */
+
+#include <vecintrin.h>
+
+void
+foo(signed char *p, int i) {
+  vec_load_bndry(p, i); /* { dg-error "constant value required for builtin.*2" } */
+}