re PR rtl-optimization/64172 (Wrong code with GCC vector extensions on ARM when…

re PR rtl-optimization/64172 (Wrong code with GCC vector extensions on ARM when compiled without NEON)

2015-02-20  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/64172
	* ira-color.c (color_pass): Prevent splitting multi-register
	pseudos.

From-SVN: r220877

gcc/ChangeLog

+2015-02-20  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR target/64172
+	* ira-color.c (color_pass): Prevent splitting multi-register
+	pseudos.
+
 2015-02-20  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/65136

gcc/ira-color.c

@@ -3274,7 +3274,11 @@ color_pass (ira_loop_tree_node_t loop_tree_node)
 	       && (loop_tree_node->reg_pressure[pclass]
 		   <= ira_class_hard_regs_num[pclass]))
 	      || (pic_offset_table_rtx != NULL
-		  && regno == (int) REGNO (pic_offset_table_rtx)))
+		  && regno == (int) REGNO (pic_offset_table_rtx))
+	      /* Avoid overlapped multi-registers. Moves between them
+		 might result in wrong code generation.  */
+	      || (hard_regno >= 0
+		  && ira_reg_class_max_nregs[pclass][mode] > 1))
 	    {
 	      if (! ALLOCNO_ASSIGNED_P (subloop_allocno))
 		{