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.
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. */
