Check suitability of spill register for mode

2019-11-14  Kwok Cheung Yeung  <kcy@codesourcery.com>

	gcc/
	* lra-spills.c (assign_spill_hard_regs): Check that the spill
	register is suitable for the mode.

From-SVN: r278267

gcc/ChangeLog

+2019-11-14  Kwok Cheung Yeung  <kcy@codesourcery.com>
+
+	* lra-spills.c (assign_spill_hard_regs): Check that the spill
+	register is suitable for the mode.
+
 2019-11-14  Andrew MacLeod  <amacleod@redhat.com>
 
 	* range-op.h (range_operator::fold_range): Return a bool.

gcc/lra-spills.c

@@ -283,7 +283,8 @@ assign_spill_hard_regs (int *pseudo_regnos, int n)
       for (k = 0; k < spill_class_size; k++)
 	{
 	  hard_regno = ira_class_hard_regs[spill_class][k];
-	  if (TEST_HARD_REG_BIT (eliminable_regset, hard_regno))
+	  if (TEST_HARD_REG_BIT (eliminable_regset, hard_regno)
+	      || !targetm.hard_regno_mode_ok (hard_regno, mode))
 	    continue;
 	  if (! overlaps_hard_reg_set_p (conflict_hard_regs, mode, hard_regno))
 	    break;