combine.c (try_combine): Dump information about the insns we're combining.

	* combine.c (try_combine): Dump information about the insns we're
	combining.

From-SVN: r148828

gcc/ChangeLog

 2009-06-22  Adam Nemet  <anemet@caviumnetworks.com>
 
+	* combine.c (try_combine): Dump information about the insns we're
+	combining.
+
+2009-06-22  Adam Nemet  <anemet@caviumnetworks.com>
+
 	* combine.c (combine_simplify_rtx): Remove TRULY_NOOP_TRUNCATION
 	check when calling force_to_mode on TRUNCATE's operand.
 

gcc/combine.c

@@ -2256,6 +2256,16 @@ try_combine (rtx i3, rtx i2, rtx i1, int *new_direct_jump_p)
   /* Reset the hard register usage information.  */
   CLEAR_HARD_REG_SET (newpat_used_regs);
 
+  if (dump_file && (dump_flags & TDF_DETAILS))
+    {
+      if (i1)
+	fprintf (dump_file, "\nTrying %d, %d -> %d:\n",
+		 INSN_UID (i1), INSN_UID (i2), INSN_UID (i3));
+      else
+	fprintf (dump_file, "\nTrying %d -> %d:\n",
+		 INSN_UID (i2), INSN_UID (i3));
+    }
+
   /* If I1 and I2 both feed I3, they can be in any order.  To simplify the
      code below, set I1 to be the earlier of the two insns.  */
   if (i1 && DF_INSN_LUID (i1) > DF_INSN_LUID (i2))