Patchwork [rx] add initial rtx_costs() function

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Submitter DJ Delorie
Date May 1, 2012, 5:44 a.m.
Message ID <201205010544.q415iixN000349@greed.delorie.com>
Download mbox | patch
Permalink /patch/156008/
State New
Headers show

Comments

DJ Delorie - May 1, 2012, 5:44 a.m.
Initial implementation of RTX_COSTS target function for rx-elf.  Minor
increase in coremark scores, and enables division by multiplication of
reciprocals, tested on trunk and 4.7.  Ok for trunk and/or 4.7 branch?

	* config/rx/rx.c (TARGET_RTX_COSTS): Define.
	(rx_rtx_costs): New.
Nick Clifton - May 1, 2012, 8:48 a.m.
Hi DJ,

> Initial implementation of RTX_COSTS target function for rx-elf.  Minor
> increase in coremark scores, and enables division by multiplication of
> reciprocals, tested on trunk and 4.7.  Ok for trunk and/or 4.7 branch?
>
> 	* config/rx/rx.c (TARGET_RTX_COSTS): Define.
> 	(rx_rtx_costs): New.

OK for both.

Cheers
   Nick

Patch

Index: gcc/config/rx/rx.c
===================================================================
--- gcc/config/rx/rx.c	(revision 186534)
+++ gcc/config/rx/rx.c	(working copy)
@@ -2738,12 +2738,65 @@  rx_address_cost (rtx addr, bool speed)
     /* Try to discourage REG + <large OFF> when optimizing for size.  */
     return COSTS_N_INSNS (2);
     
   return COSTS_N_INSNS (1);
 }
 
+#undef  TARGET_RTX_COSTS
+#define TARGET_RTX_COSTS rx_rtx_costs
+
+static bool
+rx_rtx_costs (rtx   x,
+	      int   code,
+	      int   outer_code ATTRIBUTE_UNUSED,
+	      int   opno ATTRIBUTE_UNUSED,
+	      int * total,
+	      bool  speed ATTRIBUTE_UNUSED)
+{
+  switch (code)
+    {
+    case MULT:
+      if (GET_MODE (x) == DImode)
+	{
+	  *total = COSTS_N_INSNS (2);
+	  return true;
+	}
+      /* fall through */
+    case PLUS:
+    case MINUS:
+    case AND:
+    case COMPARE:
+    case IOR:
+    case XOR:
+      if (GET_CODE (XEXP (x, 0)) == MEM
+	  || GET_CODE (XEXP (x, 1)) == MEM)
+	*total = COSTS_N_INSNS (3);
+      else
+	*total = COSTS_N_INSNS (1);
+      return true;
+
+    case DIV:
+      /* This is worst case.  */
+      *total = COSTS_N_INSNS (20);
+      return true;
+
+    case UDIV:
+      /* This is worst case.  */
+      *total = COSTS_N_INSNS (18);
+      return true;
+
+    case IF_THEN_ELSE:
+      *total = COSTS_N_INSNS (3);
+      return true;
+
+    default:
+      break;
+    }
+  return false;
+}
+
 static bool
 rx_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
 {
   /* We can always eliminate to the frame pointer.
      We can eliminate to the stack pointer unless a frame
      pointer is needed.  */