re PR rtl-optimization/26087 (ICE in df_find_use)

	PR rtl-optimization/26087
	* rtlanal.c (canonicalize_condition): Do not cross basic block
	boundaries.

From-SVN: r110614

gcc/ChangeLog

+2006-02-04  Zdenek Dvorak <dvorakz@suse.cz>
+
+	PR rtl-optimization/26087
+	* rtlanal.c (canonicalize_condition): Do not cross basic block
+	boundaries.
+
 2006-02-04  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR debug/24444

gcc/rtlanal.c

@@ -4508,6 +4508,7 @@ canonicalize_condition (rtx insn, rtx cond, int reverse, rtx *earliest,
   rtx op0, op1;
   int reverse_code = 0;
   enum machine_mode mode;
+  basic_block bb = BLOCK_FOR_INSN (insn);
 
   code = GET_CODE (cond);
   mode = GET_MODE (cond);
@@ -4569,7 +4570,11 @@ canonicalize_condition (rtx insn, rtx cond, int reverse, rtx *earliest,
 
       if ((prev = prev_nonnote_insn (prev)) == 0
 	  || !NONJUMP_INSN_P (prev)
-	  || FIND_REG_INC_NOTE (prev, NULL_RTX))
+	  || FIND_REG_INC_NOTE (prev, NULL_RTX)
+	  /* In cfglayout mode, there do not have to be labels at the
+	     beginning of a block, or jumps at the end, so the previous
+	     conditions would not stop us when we reach bb boundary.  */
+	  || BLOCK_FOR_INSN (prev) != bb)
 	break;
 
       set = set_of (op0, prev);