re PR target/83387 (PowerPC64: Infinite loops in do_reload() with -msoft-float)

	PR target/83387
	* config/rs6000/rs6000.c (rs6000_discover_homogeneous_aggregate): Do not
	allow arguments in FP registers if TARGET_HARD_FLOAT is false.

From-SVN: r256250

gcc/ChangeLog

+2018-01-04  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/83387
+	* config/rs6000/rs6000.c (rs6000_discover_homogeneous_aggregate): Do not
+	allow arguments in FP registers if TARGET_HARD_FLOAT is false.
+
 2018-01-04  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/83666

gcc/config/rs6000/rs6000.c

@@ -11097,7 +11097,8 @@ rs6000_discover_homogeneous_aggregate (machine_mode mode, const_tree type,
      homogeneous aggregates; these types are handled via the
      targetm.calls.split_complex_arg mechanism.  Complex types
      can be elements of homogeneous aggregates, however.  */
-  if (DEFAULT_ABI == ABI_ELFv2 && type && AGGREGATE_TYPE_P (type))
+  if (TARGET_HARD_FLOAT && DEFAULT_ABI == ABI_ELFv2 && type
+      && AGGREGATE_TYPE_P (type))
     {
       machine_mode field_mode = VOIDmode;
       int field_count = rs6000_aggregate_candidate (type, &field_mode);