Make more use of in_hard_reg_set_p

[Richard Sandiford]

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.

Tested on aarch64-linux-gnu, x86_64-linux-gnu and powerpc64le-linux-gnu.
Also tested by comparing the testsuite assembly output on at least one
target per CPU directory.  OK to install?

Richard


2017-09-11  Richard Sandiford  <richard.sandif...@linaro.org>

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

Index: gcc/ira-costs.c
===================================================================
--- gcc/ira-costs.c     2017-09-04 11:48:57.531552460 +0100
+++ gcc/ira-costs.c     2017-09-11 17:21:26.382315018 +0100
@@ -1386,7 +1386,7 @@ record_operand_costs (rtx_insn *insn, en
          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--)
@@ -1398,18 +1398,9 @@ record_operand_costs (rtx_insn *insn, en
                {
                  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])
-                       op_costs[i]->cost[k] = -frequency;
-                   }
+                 else if (in_hard_reg_set_p (reg_class_contents[rclass],
+                                             mode, other_regno))
+                   op_costs[i]->cost[k] = -frequency;
                }
            }
        }