[PATCH 5/8] [RS6000] rs6000_rtx_costs cost IOR

[Alan Modra]

	* config/rs6000/rs6000.c (rotate_insert_cost): New function.
	(rs6000_rtx_costs): Cost IOR.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 383d2901c9f..15a806fe307 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -21206,6 +21206,91 @@ rs6000_cannot_copy_insn_p (rtx_insn *insn)
 	 && get_attr_cannot_copy (insn);
 }
 
+/* Handle rtx_costs for scalar integer rotate and insert insns.  */
+
+static bool
+rotate_insert_cost (rtx left, rtx right, machine_mode mode, bool speed,
+		    int *total)
+{
+  if (GET_CODE (right) == AND
+      && CONST_INT_P (XEXP (right, 1))
+      && UINTVAL (XEXP (left, 1)) + UINTVAL (XEXP (right, 1)) + 1 == 0)
+    {
+      rtx leftop = XEXP (left, 0);
+      rtx rightop = XEXP (right, 0);
+
+      /* rotlsi3_insert_5.  */
+      if (REG_P (leftop)
+	  && REG_P (rightop)
+	  && mode == SImode
+	  && UINTVAL (XEXP (left, 1)) != 0
+	  && UINTVAL (XEXP (right, 1)) != 0
+	  && rs6000_is_valid_mask (XEXP (left, 1), NULL, NULL, mode))
+	return true;
+      /* rotldi3_insert_6.  */
+      if (REG_P (leftop)
+	  && REG_P (rightop)
+	  && mode == DImode
+	  && exact_log2 (-UINTVAL (XEXP (left, 1))) > 0)
+	return true;
+      /* rotldi3_insert_7.  */
+      if (REG_P (leftop)
+	  && REG_P (rightop)
+	  && mode == DImode
+	  && exact_log2 (-UINTVAL (XEXP (right, 1))) > 0)
+	return true;
+
+      rtx mask = 0;
+      rtx shift = leftop;
+      rtx_code shift_code = GET_CODE (shift);
+      /* rotl<mode>3_insert.  */
+      if (shift_code == ROTATE
+	  || shift_code == ASHIFT
+	  || shift_code == LSHIFTRT)
+	mask = right;
+      else
+	{
+	  shift = rightop;
+	  shift_code = GET_CODE (shift);
+	  /* rotl<mode>3_insert_2.  */
+	  if (shift_code == ROTATE
+	      || shift_code == ASHIFT
+	      || shift_code == LSHIFTRT)
+	    mask = left;
+	}
+      if (mask
+	  && CONST_INT_P (XEXP (shift, 1))
+	  && rs6000_is_valid_insert_mask (XEXP (mask, 1), shift, mode))
+	{
+	  *total += rtx_cost (XEXP (shift, 0), mode, shift_code, 0, speed);
+	  *total += rtx_cost (XEXP (mask, 0), mode, AND, 0, speed);
+	  return true;
+	}
+    }
+  /* rotl<mode>3_insert_3.  */
+  if (GET_CODE (right) == ASHIFT
+      && CONST_INT_P (XEXP (right, 1))
+      && (INTVAL (XEXP (right, 1))
+	  == exact_log2 (UINTVAL (XEXP (left, 1)) + 1)))
+    {
+      *total += rtx_cost (XEXP (left, 0), mode, AND, 0, speed);
+      *total += rtx_cost (XEXP (right, 0), mode, ASHIFT, 0, speed);
+      return true;
+    }
+  /* rotl<mode>3_insert_4.  */
+  if (GET_CODE (right) == LSHIFTRT
+      && CONST_INT_P (XEXP (right, 1))
+      && mode == SImode
+      && (INTVAL (XEXP (right, 1))
+	  + exact_log2 (-UINTVAL (XEXP (left, 1)))) == 32)
+    {
+      *total += rtx_cost (XEXP (left, 0), mode, AND, 0, speed);
+      *total += rtx_cost (XEXP (right, 0), mode, LSHIFTRT, 0, speed);
+      return true;
+    }
+  return false;
+}
+
 /* Compute a (partial) cost for rtx X.  Return true if the complete
    cost has been computed, and false if subexpressions should be
    scanned.  In either case, *TOTAL contains the cost result.
@@ -21253,7 +21338,7 @@ static bool
 rs6000_rtx_costs (rtx x, machine_mode mode, int outer_code,
 		  int opno ATTRIBUTE_UNUSED, int *total, bool speed)
 {
-  rtx right;
+  rtx left, right;
   int code = GET_CODE (x);
 
   switch (code)
@@ -21435,7 +21520,7 @@ rs6000_rtx_costs (rtx x, machine_mode mode, int outer_code,
       right = XEXP (x, 1);
       if (CONST_INT_P (right))
 	{
-	  rtx left = XEXP (x, 0);
+	  left = XEXP (x, 0);
 	  rtx_code left_code = GET_CODE (left);
 
 	  /* rotate-and-mask: 1 insn.  */
@@ -21452,9 +21537,16 @@ rs6000_rtx_costs (rtx x, machine_mode mode, int outer_code,
       return false;
 
     case IOR:
-      /* FIXME */
       *total = COSTS_N_INSNS (1);
-      return true;
+      left = XEXP (x, 0);
+      if (GET_CODE (left) == AND
+	  && CONST_INT_P (XEXP (left, 1)))
+	{
+	  right = XEXP (x, 1);
+	  if (rotate_insert_cost (left, right, mode, speed, total))
+	    return true;
+	}
+      return false;
 
     case CLZ:
     case XOR: