alias.c [...] (init_alias_analysis, [...]): Use memset () instead of bzero ().

[gcc.git] / gcc / jump.c

diff --git a/gcc/jump.c b/gcc/jump.c
index 5f575894a3062fe9cb4d60ed9870a7a1e33645d0..4c9c5ea2faed1eace6fd16ede1cd38825c6ecb58 100644 (file)
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -95,10 +95,6 @@ static rtx *jump_chain;
 
 static int max_jump_chain;
 
-/* Set nonzero by jump_optimize if control can fall through
-   to the end of the function.  */
-int can_reach_end;
-
 /* Indicates whether death notes are significant in cross jump analysis.
    Normally they are not significant, because of A and B jump to C,
    and R dies in A, it must die in B.  But this might not be true after
@@ -112,7 +108,6 @@ static void delete_barrier_successors       PARAMS ((rtx));
 static void mark_all_labels            PARAMS ((rtx, int));
 static rtx delete_unreferenced_labels  PARAMS ((rtx));
 static void delete_noop_moves          PARAMS ((rtx));
-static int calculate_can_reach_end     PARAMS ((rtx, int));
 static int duplicate_loop_exit_test    PARAMS ((rtx));
 static void find_cross_jump            PARAMS ((rtx, rtx, int, rtx *, rtx *));
 static void do_cross_jump              PARAMS ((rtx, rtx, rtx));
@@ -743,13 +738,6 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan,
        }
   }
 
-  /* CAN_REACH_END is persistent for each function.  Once set it should
-     not be cleared.  This is especially true for the case where we
-     delete the NOTE_FUNCTION_END note.  CAN_REACH_END is cleared by
-     the front-end before compiling each function.  */
-  if (! minimal && calculate_can_reach_end (last_insn, optimize != 0))
-    can_reach_end = 1;
-
 end:
   /* Clean up.  */
   free (jump_chain);
@@ -855,7 +843,7 @@ mark_all_labels (f, cross_jump)
   rtx insn;
 
   for (insn = f; insn; insn = NEXT_INSN (insn))
-    if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
+    if (INSN_P (insn))
       {
        if (GET_CODE (insn) == CALL_INSN
            && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER)
@@ -1062,66 +1050,6 @@ delete_noop_moves (f)
     }
 }
 
-/* See if there is still a NOTE_INSN_FUNCTION_END in this function.
-   If so indicate that this function can drop off the end by returning
-   1, else return 0.
-
-   CHECK_DELETED indicates whether we must check if the note being
-   searched for has the deleted flag set.
-
-   DELETE_FINAL_NOTE indicates whether we should delete the note
-   if we find it.  */
-
-static int
-calculate_can_reach_end (last, delete_final_note)
-     rtx last;
-     int delete_final_note;
-{
-  rtx insn = last;
-  int n_labels = 1;
-
-  while (insn != NULL_RTX)
-    {
-      int ok = 0;
-
-      /* One label can follow the end-note: the return label.  */
-      if (GET_CODE (insn) == CODE_LABEL && n_labels-- > 0)
-       ok = 1;
-      /* Ordinary insns can follow it if returning a structure.  */
-      else if (GET_CODE (insn) == INSN)
-       ok = 1;
-      /* If machine uses explicit RETURN insns, no epilogue,
-        then one of them follows the note.  */
-      else if (GET_CODE (insn) == JUMP_INSN
-              && GET_CODE (PATTERN (insn)) == RETURN)
-       ok = 1;
-      /* A barrier can follow the return insn.  */
-      else if (GET_CODE (insn) == BARRIER)
-       ok = 1;
-      /* Other kinds of notes can follow also.  */
-      else if (GET_CODE (insn) == NOTE
-              && NOTE_LINE_NUMBER (insn) != NOTE_INSN_FUNCTION_END)
-       ok = 1;
-
-      if (ok != 1)
-       break;
-
-      insn = PREV_INSN (insn);
-    }
-
-  /* See if we backed up to the appropriate type of note.  */
-  if (insn != NULL_RTX
-      && GET_CODE (insn) == NOTE
-      && NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_END)
-    {
-      if (delete_final_note)
-       delete_insn (insn);
-      return 1;
-    }
-
-  return 0;
-}
-
 /* LOOP_START is a NOTE_INSN_LOOP_BEG note that is followed by an unconditional
    jump.  Assume that this unconditional jump is to the exit test code.  If
    the code is sufficiently simple, make a copy of it before INSN,
@@ -3095,7 +3023,7 @@ never_reached_warning (avoided_insn)
            two_avoided_lines |= (NOTE_LINE_NUMBER (a_line_note)
                                  != NOTE_LINE_NUMBER (insn));
        }
-      else if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
+      else if (INSN_P (insn))
        contains_insn = 1;
     }
   if (two_avoided_lines && contains_insn)
@@ -3817,7 +3745,7 @@ thread_jumps (f, max_reg, flag_before_loop)
              || ! any_condjump_p (b1) || JUMP_LABEL (b1) == 0)
            continue;
 
-         bzero (modified_regs, max_reg * sizeof (char));
+         memset (modified_regs, 0, max_reg * sizeof (char));
          modified_mem = 0;
 
          bcopy ((char *) all_reset, (char *) same_regs,