middle-end/10336: [3.4 regression] ICE with -Wunreachable-code

[Jason Merrill]

The following reply was made to PR middle-end/10336; it has been noted by GNATS.

From: Jason Merrill <jason@redhat.com>
To: bangerth@dealii.org
Cc: gcc-bugs@gcc.gnu.org, reichelt@igpm.rwth-aachen.de, gcc-gnats@gcc.gnu.org
Subject: Re: middle-end/10336: [3.4 regression] ICE with -Wunreachable-code
Date: Tue, 29 Apr 2003 13:32:15 -0400

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 Well, this has been an annoyingly persistent problem.  :) 
 I'm testing this patch now:
 
 
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 Content-Type: text/x-patch
 Content-Disposition: inline
 
 *** jump.c.~1~	2003-04-29 12:32:39.000000000 -0400
 --- jump.c	2003-04-29 12:57:54.000000000 -0400
 *************** never_reached_warning (avoided_insn, fin
 *** 1912,1924 ****
     /* Back up to the first of any NOTEs preceding avoided_insn; flow passes
        us the head of a block, a NOTE_INSN_BASIC_BLOCK, which often follows
        the line note.  */
 !   for (insn = PREV_INSN (avoided_insn); ; insn = PREV_INSN (insn))
 !     if (GET_CODE (insn) != NOTE
 ! 	|| NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG)
 !       {
 ! 	insn = NEXT_INSN (insn);
   	break;
 !       }
   
     /* Scan forwards, looking at LINE_NUMBER notes, until we hit a LABEL
        in case FINISH is NULL, otherwise until we run out of insns.  */
 --- 1912,1926 ----
     /* Back up to the first of any NOTEs preceding avoided_insn; flow passes
        us the head of a block, a NOTE_INSN_BASIC_BLOCK, which often follows
        the line note.  */
 !   insn = avoided_insn;
 !   while (1)
 !     {
 !       rtx prev = PREV_INSN (insn);
 !       if (prev == NULL_RTX
 ! 	  || GET_CODE (prev) != NOTE)
   	break;
 !       insn = prev;
 !     }
   
     /* Scan forwards, looking at LINE_NUMBER notes, until we hit a LABEL
        in case FINISH is NULL, otherwise until we run out of insns.  */
 
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