S/390: Reject long disp for vector load/store early

The vector memory instructions only support short displacements.
Reject invalid displacements early to prevent plenty of lay
instructions to be generated later which then cannot be merged
properly.

gcc/ChangeLog:

2019-04-03  Andreas Krebbel  <krebbel@linux.ibm.com>

	* config/s390/s390.c (s390_legitimate_address_p): Reject long
	displacement addresses for vector mode operands.

From-SVN: r270122

gcc/ChangeLog

+2019-04-03  Andreas Krebbel  <krebbel@linux.ibm.com>
+
+	* config/s390/s390.c (s390_legitimate_address_p): Reject long
+	displacement addresses for vector mode operands.
+
 2019-04-03  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.c (GMASK_LEN): Define.

gcc/config/s390/s390.c

@@ -4677,6 +4677,17 @@ s390_legitimate_address_p (machine_mode mode, rtx addr, bool strict)
   if (!s390_decompose_address (addr, &ad))
     return false;
 
+  /* The vector memory instructions only support short displacements.
+     Reject invalid displacements early to prevent plenty of lay
+     instructions to be generated later which then cannot be merged
+     properly.  */
+  if (TARGET_VX
+      && VECTOR_MODE_P (mode)
+      && ad.disp != NULL_RTX
+      && CONST_INT_P (ad.disp)
+      && !SHORT_DISP_IN_RANGE (INTVAL (ad.disp)))
+    return false;
+
   if (strict)
     {
       if (ad.base && !REGNO_OK_FOR_BASE_P (REGNO (ad.base)))