[Bug middle-end/54364] Tail call jumps not threaded

[xguo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54364

--- Comment #4 from xuepeng guo <xguo at gcc dot gnu.org> 2012-09-26 03:17:59 UTC ---
Author: xguo
Date: Wed Sep 26 03:17:54 2012
New Revision: 191751

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191751
Log:
2012-09-26  Zhenqiang Chen  <zhenqiang.chen@arm.com>

        Backport from 2012-09-19 mainline r191462

        PR middle-end/54364
        * bb-reorder.c (connect_better_edge_p): New added.
        (find_traces_1_round): When optimizing for size, ignore edge frequency
        and probability, and handle all in one round.
        (bb_to_key): Use bb->index as key when optimizing for size.
        (better_edge_p): The bb with smaller index is better when optimizing
        for size.
        (connect_traces): When optimizing for size, connect block n with
        block n + 1; connect trace m with trace m + 1 if falling through.
        (gate_handle_reorder_blocks): Enable bbro when optimizing for -Os.


Modified:
    branches/ARM/embedded-4_7-branch/gcc/ChangeLog.arm
    branches/ARM/embedded-4_7-branch/gcc/bb-reorder.c