re PR target/88207 (gcc.target/i386/pr22076.c etc. FAIL)

2018-11-28  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/88207
	* ira-costs.c (scan_one_insn): Process subregs when updating costs
	for pseudos and allocnos from insn.

From-SVN: r266582

gcc/ChangeLog

+2018-11-28  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR target/88207
+	* ira-costs.c (scan_one_insn): Process subregs when updating costs
+	for pseudos and allocnos from insn.
+
 2018-11-28  David Edelsohn  <dje.gcc@gmail.com>
 
 	* config/rs6000/aix72.h: Update to match aix71.h changes.

gcc/ira-costs.c

@@ -1535,10 +1535,14 @@ scan_one_insn (rtx_insn *insn)
   /* Now add the cost for each operand to the total costs for its
      allocno.  */
   for (i = 0; i < recog_data.n_operands; i++)
-    if (REG_P (recog_data.operand[i])
-	&& REGNO (recog_data.operand[i]) >= FIRST_PSEUDO_REGISTER)
     {
-	int regno = REGNO (recog_data.operand[i]);
+      rtx op = recog_data.operand[i];
+      
+      if (GET_CODE (op) == SUBREG)
+	op = SUBREG_REG (op);
+      if (REG_P (op) && REGNO (op) >= FIRST_PSEUDO_REGISTER)
+	{
+	  int regno = REGNO (op);
 	  struct costs *p = COSTS (costs, COST_INDEX (regno));
 	  struct costs *q = op_costs[i];
 	  int *p_costs = p->cost, *q_costs = q->cost;
@@ -1564,7 +1568,7 @@ scan_one_insn (rtx_insn *insn)
 		p_costs[k] += add_cost;
 	    }
 	}
-
+    }
   return insn;
 }