alpha.c (alpha_tablejump_addr_vec): New.

* config/alpha/alpha.c (alpha_tablejump_addr_vec): New.
        (alpha_tablejump_best_label): New.
        * config/alpha/alpha-protos.h: Declare them.
        * config/alpha/alpha.md: Use braced strings for code blocks.
        (tablejump_osf): Break out add with r29.
        (tablejump_osf_internal): Remove.
        (tablejump_osf_nt_internal): Rename from tablejump_nt_internal,
        use alpha_tablejump_addr_vec and alpha_tablejump_best_label.

From-SVN: r44022

gcc/ChangeLog

@@ -1,3 +1,14 @@
+2001-07-15  Richard Henderson  <rth@redhat.com>
+
+	* config/alpha/alpha.c (alpha_tablejump_addr_vec): New.
+	(alpha_tablejump_best_label): New.
+	* config/alpha/alpha-protos.h: Declare them.
+	* config/alpha/alpha.md: Use braced strings for code blocks.
+	(tablejump_osf): Break out add with r29.
+	(tablejump_osf_internal): Remove.
+	(tablejump_osf_nt_internal): Rename from tablejump_nt_internal,
+	use alpha_tablejump_addr_vec and alpha_tablejump_best_label.
+
 Sun Jul 15 00:53:35 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 	* loop.c (scan_loop): Add USEs inside PARALLELs into dependencies

gcc/config/alpha/alpha-protos.h

@@ -70,6 +70,8 @@ extern int normal_memory_operand PARAMS ((rtx, enum machine_mode));
 extern int reg_no_subreg_operand PARAMS ((rtx, enum machine_mode));
 extern int addition_operation PARAMS ((rtx, enum machine_mode));
 
+extern rtx alpha_tablejump_addr_vec PARAMS ((rtx));
+extern rtx alpha_tablejump_best_label PARAMS ((rtx));
 extern void get_aligned_mem PARAMS ((rtx, rtx *, rtx *));
 extern rtx get_unaligned_address PARAMS ((rtx, int));
 extern enum reg_class secondary_reload_class PARAMS ((enum reg_class,

gcc/config/alpha/alpha.c

@@ -1074,6 +1074,61 @@ direct_return ()
 	  && current_function_outgoing_args_size == 0
 	  && current_function_pretend_args_size == 0);
 }
+
+/* Return the ADDR_VEC associated with a tablejump insn.  */
+
+rtx
+alpha_tablejump_addr_vec (insn)
+     rtx insn;
+{
+  rtx tmp;
+
+  tmp = JUMP_LABEL (insn);
+  if (!tmp)
+    return NULL_RTX;
+  tmp = NEXT_INSN (tmp);
+  if (!tmp)
+    return NULL_RTX;
+  if (GET_CODE (tmp) == JUMP_INSN
+      && GET_CODE (PATTERN (tmp)) == ADDR_DIFF_VEC)
+    return PATTERN (tmp);
+  return NULL_RTX;
+}
+
+/* Return the label of the predicted edge, or CONST0_RTX if we don't know.  */
+
+rtx
+alpha_tablejump_best_label (insn)
+     rtx insn;
+{
+  rtx jump_table = alpha_tablejump_addr_vec (insn);
+  rtx best_label = NULL_RTX;
+
+  /* ??? Once the CFG doesn't keep getting completely rebuilt, look
+     there for edge frequency counts from profile data.  */
+
+  if (jump_table)
+    {
+      int n_labels = XVECLEN (jump_table, 1);
+      int best_count = -1;
+      int i, j;
+
+      for (i = 0; i < n_labels; i++)
+	{
+	  int count = 1;
+
+	  for (j = i + 1; j < n_labels; j++)
+	    if (XEXP (XVECEXP (jump_table, 1, i), 0)
+		== XEXP (XVECEXP (jump_table, 1, j), 0))
+	      count++;
+
+	  if (count > best_count)
+	    best_count = count, best_label = XVECEXP (jump_table, 1, i);
+	}
+    }
+
+  return best_label ? best_label : const0_rtx;
+}
 
 /* REF is an alignable memory location.  Place an aligned SImode
    reference into *PALIGNED_MEM and the number of bits to shift into