jump.c (squeeze_notes): Return true if no real insns were found.

	* jump.c (squeeze_notes): Return true if no real insns were found.
	* rtl.h (squeeze_notes): Adjust prototype.
	* cfgcleanup.c (merge_blocks_move_predecessor_nojumps): If
	squeeze_notes finds no real instructions, abort.
	(merge_blocks_move_successor_nojumps): Likewise.
	* loop.c (find_and_verify_loops): Likewise.
	* stmt.c (expand_end_case): Likewise.
	* ifcvt.c (dead_or_predicable): Return TRUE if squeeze_notes doesn't
	find any real instructions.

	* gcc.c-torture/compile/20011114-4.c: New test.

From-SVN: r47048

1 files changed, 6 insertions, 5 deletions

diff --git a/gcc/jump.c b/gcc/jump.c
index a7f18c058d4..c886aca6047 100644
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -541,9 +541,10 @@ duplicate_loop_exit_test (loop_start)
 /* Move all block-beg, block-end, loop-beg, loop-cont, loop-vtop, loop-end,
    notes between START and END out before START.  START and END may be such
    notes.  Returns the values of the new starting and ending insns, which
-   may be different if the original ones were such notes.  */
+   may be different if the original ones were such notes.
+   Return true if there were only such notes and no real instructions.  */
 
-void
+bool
 squeeze_notes (startp, endp)
      rtx* startp;
      rtx* endp;
@@ -584,15 +585,15 @@ squeeze_notes (startp, endp)
 	last = insn;
     }
 
-  /* There were no real instructions, and we can't represent an empty
-     range.  Die.  */
+  /* There were no real instructions.  */
   if (start == past_end)
-    abort ();
+    return true;
 
   end = last;
 
   *startp = start;
   *endp = end;
+  return false;
 }
 
 /* Return the label before INSN, or put a new label there.  */