* unroll.c (copy_loop_body): Always ensure at least two insns

        are in the copied loop.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26261 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 6 insertions, 0 deletions

diff --git a/gcc/unroll.c b/gcc/unroll.c
index e119352dc8a..9c0109da86b 100644
--- a/gcc/unroll.c
+++ b/gcc/unroll.c
@@ -1671,6 +1671,12 @@ copy_loop_body (copy_start, copy_end, map, exit_label, last_iteration,
 
   start_sequence ();
 
+  /* Emit a NOTE_INSN_DELETED to force at least two insns onto the sequence.
+     Else gen_sequence could return a raw pattern for a jump which we pass
+     off to emit_insn_before (instead of emit_jump_insn_before) which causes
+     a variety of losing behaviors later.  */
+  emit_note (0, NOTE_INSN_DELETED);
+
   insn = copy_start;
   do
     {