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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. From-SVN: r186104
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