* cfg.c (dump_flow_info): Skip register dump if reg_n_info null.

From-SVN: r71485

gcc/ChangeLog

+2003-09-17  Richard Henderson  <rth@redhat.com>
+
+	* cfg.c (dump_flow_info): Skip register dump if reg_n_info null.
+
 2003-09-17  Rainer Orth  <ro@TechFak.Uni-Bielefeld.DE>
 
 	* configure.in (gcc_cv_ld_hidden): Don't test gnu_ld_flag.

gcc/cfg.c

@@ -491,48 +491,49 @@ dump_flow_info (FILE *file)
   static const char * const reg_class_names[] = REG_CLASS_NAMES;
 
   fprintf (file, "%d registers.\n", max_regno);
-  for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
-    if (REG_N_REFS (i))
-      {
-	enum reg_class class, altclass;
-
-	fprintf (file, "\nRegister %d used %d times across %d insns",
-		 i, REG_N_REFS (i), REG_LIVE_LENGTH (i));
-	if (REG_BASIC_BLOCK (i) >= 0)
-	  fprintf (file, " in block %d", REG_BASIC_BLOCK (i));
-	if (REG_N_SETS (i))
-	  fprintf (file, "; set %d time%s", REG_N_SETS (i),
-		   (REG_N_SETS (i) == 1) ? "" : "s");
-	if (regno_reg_rtx[i] != NULL && REG_USERVAR_P (regno_reg_rtx[i]))
-	  fprintf (file, "; user var");
-	if (REG_N_DEATHS (i) != 1)
-	  fprintf (file, "; dies in %d places", REG_N_DEATHS (i));
-	if (REG_N_CALLS_CROSSED (i) == 1)
-	  fprintf (file, "; crosses 1 call");
-	else if (REG_N_CALLS_CROSSED (i))
-	  fprintf (file, "; crosses %d calls", REG_N_CALLS_CROSSED (i));
-	if (regno_reg_rtx[i] != NULL
-	    && PSEUDO_REGNO_BYTES (i) != UNITS_PER_WORD)
-	  fprintf (file, "; %d bytes", PSEUDO_REGNO_BYTES (i));
-
-	class = reg_preferred_class (i);
-	altclass = reg_alternate_class (i);
-	if (class != GENERAL_REGS || altclass != ALL_REGS)
-	  {
-	    if (altclass == ALL_REGS || class == ALL_REGS)
-	      fprintf (file, "; pref %s", reg_class_names[(int) class]);
-	    else if (altclass == NO_REGS)
-	      fprintf (file, "; %s or none", reg_class_names[(int) class]);
-	    else
-	      fprintf (file, "; pref %s, else %s",
-		       reg_class_names[(int) class],
-		       reg_class_names[(int) altclass]);
-	  }
+  if (reg_n_info)
+    for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
+      if (REG_N_REFS (i))
+	{
+	  enum reg_class class, altclass;
+
+	  fprintf (file, "\nRegister %d used %d times across %d insns",
+		   i, REG_N_REFS (i), REG_LIVE_LENGTH (i));
+	  if (REG_BASIC_BLOCK (i) >= 0)
+	    fprintf (file, " in block %d", REG_BASIC_BLOCK (i));
+	  if (REG_N_SETS (i))
+	    fprintf (file, "; set %d time%s", REG_N_SETS (i),
+		     (REG_N_SETS (i) == 1) ? "" : "s");
+	  if (regno_reg_rtx[i] != NULL && REG_USERVAR_P (regno_reg_rtx[i]))
+	    fprintf (file, "; user var");
+	  if (REG_N_DEATHS (i) != 1)
+	    fprintf (file, "; dies in %d places", REG_N_DEATHS (i));
+	  if (REG_N_CALLS_CROSSED (i) == 1)
+	    fprintf (file, "; crosses 1 call");
+	  else if (REG_N_CALLS_CROSSED (i))
+	    fprintf (file, "; crosses %d calls", REG_N_CALLS_CROSSED (i));
+	  if (regno_reg_rtx[i] != NULL
+	      && PSEUDO_REGNO_BYTES (i) != UNITS_PER_WORD)
+	    fprintf (file, "; %d bytes", PSEUDO_REGNO_BYTES (i));
+
+	  class = reg_preferred_class (i);
+	  altclass = reg_alternate_class (i);
+	  if (class != GENERAL_REGS || altclass != ALL_REGS)
+	    {
+	      if (altclass == ALL_REGS || class == ALL_REGS)
+		fprintf (file, "; pref %s", reg_class_names[(int) class]);
+	      else if (altclass == NO_REGS)
+		fprintf (file, "; %s or none", reg_class_names[(int) class]);
+	      else
+		fprintf (file, "; pref %s, else %s",
+			 reg_class_names[(int) class],
+			 reg_class_names[(int) altclass]);
+	    }
 
-	if (regno_reg_rtx[i] != NULL && REG_POINTER (regno_reg_rtx[i]))
-	  fprintf (file, "; pointer");
-	fprintf (file, ".\n");
-      }
+	  if (regno_reg_rtx[i] != NULL && REG_POINTER (regno_reg_rtx[i]))
+	    fprintf (file, "; pointer");
+	  fprintf (file, ".\n");
+	}
 
   fprintf (file, "\n%d basic blocks, %d edges.\n", n_basic_blocks, n_edges);
   FOR_EACH_BB (bb)