[Bug bootstrap/51086] [4.7 regression] ICE in move_insn, at haifa-sched.c:3437

["ro at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51086

Rainer Orth <ro at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |amodra at gcc dot gnu.org

--- Comment #2 from Rainer Orth <ro at gcc dot gnu.org> 2011-11-11 13:03:22 UTC ---
A reghunt revealed that this patch

2011-11-09  Alan Modra  <amodra@gmail.com>

       * function.c (bb_active_p): Delete.
       (dup_block_and_redirect, active_insn_between): New functions.
       (convert_jumps_to_returns, emit_return_for_exit): New functions,
       split out from..
       (thread_prologue_and_epilogue_insns): ..here.  Delete
       shadowing variables.  Don't do prologue register clobber tests
       when shrink wrapping already failed.  Delete all last_bb_active
       code.  Instead compute tail block candidates for duplicating
       exit path.  Remove these from antic set.  Duplicate tails when
       reached from both blocks needing a prologue/epilogue and
       blocks not needing such.
       * ifcvt.c (dead_or_predicable): Test both flag_shrink_wrap and
       HAVE_simple_return.
       * bb-reorder.c (get_uncond_jump_length): Make global.
       * bb-reorder.h (get_uncond_jump_length): Declare.
       * cfgrtl.c (rtl_create_basic_block): Comment typo fix.
       (rtl_split_edge): Likewise.  Warning fix.
       (rtl_duplicate_bb): New function.
       (rtl_cfg_hooks): Enable can_duplicate_block_p and duplicate_block.
       * Makefile.in (function.o): Update dependencies.

is the culprit.  Alan, could you please have a look?

  Rainer