[Bug bootstrap/52808] [4.8 Regression] LTO bootstrap failed with bootstrap-profiled

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52808

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-03 11:38:10 UTC ---
Author: rguenth
Date: Tue Apr  3 11:38:04 2012
New Revision: 186104

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186104
Log:
2012-04-03  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/52808
    * tracer.c (tail_duplicate): Return whether we have duplicated
    any block.
    (tracer): If we have duplicated any block, cleanup the CFG.
    * cfghooks.c (duplicate_block): If we duplicated a loop
    header but not its loop, destroy the loop because it now has
    multiple entries.
    * tree-ssa-threadupdate.c (thread_through_loop_header): Tell
    the cfg manipulation routines we are not creating a multiple
    entry loop.

    * gcc.dg/pr52808.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr52808.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfghooks.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tracer.c
    trunk/gcc/tree-ssa-threadupdate.c