From: Richard Henderson <rth@gcc.gnu.org>
Date: Mon, 31 Dec 2001 21:33:19 +0000 (-0800)
Subject: cfgrtl.c (delete_insn): Check for not NOTE_INSN_DELETED_LABEL before decrementing... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a124fcda15387389a151fb89bc533965d3c2eb53;p=gcc.git

cfgrtl.c (delete_insn): Check for not NOTE_INSN_DELETED_LABEL before decrementing LABEL_NUSES from a...

        * cfgrtl.c (delete_insn): Check for not NOTE_INSN_DELETED_LABEL
        before decrementing LABEL_NUSES from a jump table.

From-SVN: r48431
---

diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
index e7e6e699acc..56b3bf28e6a 100644
--- a/gcc/cfgrtl.c
+++ b/gcc/cfgrtl.c
@@ -161,7 +161,15 @@ delete_insn (insn)
       int i;
 
       for (i = 0; i < len; i++)
-	LABEL_NUSES (XEXP (XVECEXP (pat, diff_vec_p, i), 0))--;
+	{
+	  rtx label = XEXP (XVECEXP (pat, diff_vec_p, i), 0);
+
+	  /* When deleting code in bulk (e.g. removing many unreachable
+	     blocks) we can delete a label that's a target of the vector
+	     before deleting the vector itself.  */
+	  if (GET_CODE (label) != NOTE)
+	    LABEL_NUSES (label)--;
+	}
     }
 
   return next;