Make more use of in_hard_reg_set_p

An upcoming patch will convert hard_regno_nregs into an inline
function, which in turn allows hard_regno_nregs to be used as the
name of a targetm field.  This patch rewrites a use that can use
in_hard_reg_set_p instead.

2017-09-12  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* ira-costs.c (record_operand_costs): Use in_hard_reg_set_p
	instead of hard_regno_nregs.

From-SVN: r252013

gcc/ChangeLog

 2017-09-12  Richard Sandiford  <richard.sandiford@linaro.org>
 
+	* ira-costs.c (record_operand_costs): Use in_hard_reg_set_p
+	instead of hard_regno_nregs.
+
+2017-09-12  Richard Sandiford  <richard.sandiford@linaro.org>
+
 	* config/aarch64/aarch64.c (aarch64_hard_regno_mode_ok): Use
 	end_hard_regno instead of hard_regno_nregs.
 	* config/s390/s390.c (s390_reg_clobbered_rtx): Likewise.

gcc/ira-costs.c

@@ -1386,7 +1386,7 @@ record_operand_costs (rtx_insn *insn, enum reg_class *pref)
 	  cost_classes_t cost_classes_ptr = regno_cost_classes[regno];
 	  enum reg_class *cost_classes = cost_classes_ptr->classes;
 	  reg_class_t rclass;
-	  int k, nr;
+	  int k;
 
 	  i = regno == (int) REGNO (src) ? 1 : 0;
 	  for (k = cost_classes_ptr->num - 1; k >= 0; k--)
@@ -1398,22 +1398,13 @@ record_operand_costs (rtx_insn *insn, enum reg_class *pref)
 		{
 		  if (reg_class_size[rclass] == 1)
 		    op_costs[i]->cost[k] = -frequency;
-		  else
-		    {
-		      for (nr = 0;
-			   nr < hard_regno_nregs[other_regno][mode];
-			   nr++)
-			if (! TEST_HARD_REG_BIT (reg_class_contents[rclass],
-						 other_regno + nr))
-			  break;
-		      
-		      if (nr == hard_regno_nregs[other_regno][mode])
+		  else if (in_hard_reg_set_p (reg_class_contents[rclass],
+					      mode, other_regno))
 		    op_costs[i]->cost[k] = -frequency;
 		}
 	    }
 	}
     }
-    }
 }