[Bug rtl-optimization/71275] [7 regression] Performance drop after r235660 on x86-64 in 32-bit mode.
amodra at gmail dot com
gcc-bugzilla@gcc.gnu.org
Thu May 26 06:19:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71275
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2016-05-26
CC| |amodra at gmail dot com
Assignee|unassigned at gcc dot gnu.org |amodra at gmail dot com
Ever confirmed|0 |1
--- Comment #2 from Alan Modra <amodra at gmail dot com> ---
Confirmed. combine_and_move_insns is moving an insn into the innermost loop,
which it shouldn't do due to
if (bb_loop_depth (use_bb) > bb_loop_depth (def_bb))
continue;
However, it appears that the loop info isn't set up and bb_loop_depth is
therefore returning 0 for both basic blocks.
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