* x86-tune-sched.c (ix86_adjust_cost): Fix Zen support.

From-SVN: r253684

gcc/ChangeLog

+2017-10-12  Jan Hubicka  <hubicka@ucw.cz>
+
+	* x86-tune-sched.c (ix86_adjust_cost): Fix Zen support.
+
 2017-10-12  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/alpha/alpha.c (alpha_split_conditional_move):

gcc/config/i386/x86-tune-sched.c

@@ -352,7 +352,6 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost,
     case PROCESSOR_BDVER2:
     case PROCESSOR_BDVER3:
     case PROCESSOR_BDVER4:
-    case PROCESSOR_ZNVER1:
     case PROCESSOR_BTVER1:
     case PROCESSOR_BTVER2:
     case PROCESSOR_GENERIC:
@@ -392,6 +391,35 @@ ix86_adjust_cost (rtx_insn *insn, int dep_type, rtx_insn *dep_insn, int cost,
 	}
       break;
 
+    case PROCESSOR_ZNVER1:
+      /* Stack engine allows to execute push&pop instructions in parall.  */
+      if ((insn_type == TYPE_PUSH || insn_type == TYPE_POP)
+	  && (dep_insn_type == TYPE_PUSH || dep_insn_type == TYPE_POP))
+	return 0;
+
+      memory = get_attr_memory (insn);
+
+      /* Show ability of reorder buffer to hide latency of load by executing
+	 in parallel with previous instruction in case
+	 previous instruction is not needed to compute the address.  */
+      if ((memory == MEMORY_LOAD || memory == MEMORY_BOTH)
+	  && !ix86_agi_dependent (dep_insn, insn))
+	{
+	  enum attr_unit unit = get_attr_unit (insn);
+	  int loadcost;
+
+	  if (unit == UNIT_INTEGER || unit == UNIT_UNKNOWN)
+	    loadcost = 4;
+	  else
+	    loadcost = 7;
+
+	  if (cost >= loadcost)
+	    cost -= loadcost;
+	  else
+	    cost = 0;
+	}
+      break;
+
     case PROCESSOR_CORE2:
     case PROCESSOR_NEHALEM:
     case PROCESSOR_SANDYBRIDGE: