S/390: Fix immediate vector operands for some builtins.

This fixes a problem with vec_add/sub_u128 builtins.  The
s390_expand_builtin backend function is supposed to convert the
operand to TImode *AND* load it into a vector register.  The current
implementation did only the conversion and gave up then.

gcc/ChangeLog:

2019-03-11  Andreas Krebbel  <krebbel@linux.ibm.com>

	* config/s390/s390.c (s390_expand_builtin): Do the copy_to_reg not
	only on the else branch.

gcc/testsuite/ChangeLog:

2019-03-11  Andreas Krebbel  <krebbel@linux.ibm.com>

	* gcc.target/s390/zvector/vec-addc-u128.c: New test.

From-SVN: r269583

gcc/ChangeLog

+2019-03-11  Andreas Krebbel  <krebbel@linux.ibm.com>
+
+	* config/s390/s390.c (s390_expand_builtin): Do the copy_to_reg not
+	only on the else branch.
+
 2019-03-11  Martin Liska  <mliska@suse.cz>
 
 	* gcov.c (output_intermediate_json_line): Print function

gcc/config/s390/s390.c

@@ -928,6 +928,8 @@ s390_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
 	  continue;
 	}
 
+      /* A memory operand is rejected by the memory_operand predicate.
+	 Try making the address legal by copying it into a register.  */
       if (MEM_P (op[arity])
 	  && insn_op->predicate == memory_operand
 	  && (GET_MODE (XEXP (op[arity], 0)) == Pmode
@@ -951,10 +953,14 @@ s390_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
 	{
 	  op[arity] = tmp_rtx;
 	}
-      else if (GET_MODE (op[arity]) == insn_op->mode
-	       || GET_MODE (op[arity]) == VOIDmode
-	       || (insn_op->predicate == address_operand
-		   && GET_MODE (op[arity]) == Pmode))
+
+      /* The predicate rejects the operand although the mode is fine.
+	 Copy the operand to register.  */
+      if (!insn_op->predicate (op[arity], insn_op->mode)
+	  && (GET_MODE (op[arity]) == insn_op->mode
+	      || GET_MODE (op[arity]) == VOIDmode
+	      || (insn_op->predicate == address_operand
+		  && GET_MODE (op[arity]) == Pmode)))
 	{
 	  /* An address_operand usually has VOIDmode in the expander
 	     so we cannot use this.  */

gcc/testsuite/ChangeLog

+2019-03-11  Andreas Krebbel  <krebbel@linux.ibm.com>
+
+	* gcc.target/s390/zvector/vec-addc-u128.c: New test.
+
 2019-03-11  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* c-c++-common/unroll-6.c: New test.

gcc/testsuite/gcc.target/s390/zvector/vec-addc-u128.c

+/* { dg-do compile { target { s390*-*-* } } } */
+/* { dg-options "-O3 -mzarch -march=z13 -mzvector -fno-asynchronous-unwind-tables" } */
+
+#include <vecintrin.h>
+
+vector unsigned char test(void)
+{
+   vector unsigned char a = { 0 };
+   return __builtin_s390_vec_addc_u128 (a, a);
+}