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2000-08-01 Bernd Schmidt <bernds@cygnus.co.uk>
* unroll.c (unroll_loop): Disable unrolling if there are any
jumps to the start label other than the last loop insn.
*** gcc/unroll.c 2000/05/26 00:12:51 1.128
--- gcc/unroll.c 2000/08/01 15:15:34
*************** unroll_loop (loop, insn_count, end_inser
*** 743,751 ****
else if (GET_CODE (insn) == JUMP_INSN)
{
if (JUMP_LABEL (insn))
! set_label_in_map (map,
! CODE_LABEL_NUMBER (JUMP_LABEL (insn)),
! JUMP_LABEL (insn));
else if (GET_CODE (PATTERN (insn)) == ADDR_VEC
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
{
--- 743,760 ----
else if (GET_CODE (insn) == JUMP_INSN)
{
if (JUMP_LABEL (insn))
! {
! if (insn != last_loop_insn && JUMP_LABEL (insn) == start_label)
! {
! if (loop_dump_stream)
! fprintf (loop_dump_stream,
! "Unrolling failure: found branch to loop start\n");
! return;
! }
! set_label_in_map (map,
! CODE_LABEL_NUMBER (JUMP_LABEL (insn)),
! JUMP_LABEL (insn));
! }
else if (GET_CODE (PATTERN (insn)) == ADDR_VEC
|| GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC)
{
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