From: John Hassey <hassey@gnu.org>
Date: Fri, 12 Feb 1993 15:52:54 +0000 (+0000)
Subject: (reposition_prologue_and_epilogue_notes): Allow
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9392c110ebf2313163f444f21341b6c5c8daf44c;p=gcc.git

(reposition_prologue_and_epilogue_notes): Allow
for zero length prologue and epilogue list.

From-SVN: r3465
---

diff --git a/gcc/function.c b/gcc/function.c
index 5e159a69cba..b1ce844f13b 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4750,30 +4750,33 @@ reposition_prologue_and_epilogue_notes (f)
 	     reorg has run.  */
 	  for (len = 0; prologue[len]; len++)
 	    ;
-	  for (insn = f; insn; insn = NEXT_INSN (insn))
-	    if (GET_CODE (insn) == NOTE)
-	      {
-		if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
-		  note = insn;
-	      }
-	    else if ((len -= contains (insn, prologue)) == 0)
-	      {
-		/* Find the prologue-end note if we haven't already, and
-		   move it to just after the last prologue insn.  */
-		if (note == 0)
-		  for (note = insn; note = NEXT_INSN (note);)
-		    if (GET_CODE (note) == NOTE
-			&& NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
-		      break;
-		next = NEXT_INSN (note);
-		prev = PREV_INSN (note);
-		if (prev)
-		  NEXT_INSN (prev) = next;
-		if (next)
-		  PREV_INSN (next) = prev;
-		add_insn_after (note, insn);
-		break;
-	      }
+	  for (insn = f; len && insn; insn = NEXT_INSN (insn))
+	    {
+	      if (GET_CODE (insn) == NOTE)
+		{
+		  if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END)
+		    note = insn;
+		}
+	      else if ((len -= contains (insn, prologue)) == 0)
+		{
+		  /* Find the prologue-end note if we haven't already, and
+		     move it to just after the last prologue insn.  */
+		  if (note == 0)
+		    {
+		      for (note = insn; note = NEXT_INSN (note);)
+			if (GET_CODE (note) == NOTE
+			    && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END)
+			  break;
+		    }
+		  next = NEXT_INSN (note);
+		  prev = PREV_INSN (note);
+		  if (prev)
+		    NEXT_INSN (prev) = next;
+		  if (next)
+		    PREV_INSN (next) = prev;
+		  add_insn_after (note, insn);
+		}
+	    }
 	}
 
       if (epilogue)
@@ -4785,30 +4788,33 @@ reposition_prologue_and_epilogue_notes (f)
 	     reorg has run.  */
 	  for (len = 0; epilogue[len]; len++)
 	    ;
-	  for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
-	    if (GET_CODE (insn) == NOTE)
-	      {
-		if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
-		  note = insn;
-	      }
-	    else if ((len -= contains (insn, epilogue)) == 0)
-	      {
-		/* Find the epilogue-begin note if we haven't already, and
-		   move it to just before the first epilogue insn.  */
-		if (note == 0)
-		  for (note = insn; note = PREV_INSN (note);)
-		    if (GET_CODE (note) == NOTE
-			&& NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
-		      break;
-		next = NEXT_INSN (note);
-		prev = PREV_INSN (note);
-		if (prev)
-		  NEXT_INSN (prev) = next;
-		if (next)
-		  PREV_INSN (next) = prev;
-		add_insn_after (note, PREV_INSN (insn));
-		break;
-	      }
+	  for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn))
+	    {
+	      if (GET_CODE (insn) == NOTE)
+		{
+		  if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG)
+		    note = insn;
+		}
+	      else if ((len -= contains (insn, epilogue)) == 0)
+		{
+		  /* Find the epilogue-begin note if we haven't already, and
+		     move it to just before the first epilogue insn.  */
+		  if (note == 0)
+		    {
+		      for (note = insn; note = PREV_INSN (note);)
+			if (GET_CODE (note) == NOTE
+			    && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG)
+			  break;
+		    }
+		  next = NEXT_INSN (note);
+		  prev = PREV_INSN (note);
+		  if (prev)
+		    NEXT_INSN (prev) = next;
+		  if (next)
+		    PREV_INSN (next) = prev;
+		  add_insn_after (note, PREV_INSN (insn));
+		}
+	    }
 	}
     }
 #endif /* HAVE_prologue or HAVE_epilogue */