re PR rtl-optimization/33009 (-frtl-abstract-sequences causes an infinite loop)

re PR rtl-optimization/33009 (-frtl-abstract-sequences causes an infinite loop)

2008-03-05  Gabor Loki  <loki@gcc.gnu.org>

	PR gcc/33009
	* rtl-factoring.c (clear_regs_live_in_seq): Fix backward steps.
	(split_block_and_df_analyze): New. Split basic block and rebuild
	dataflow.
	(block_label_after): Use SPLIT_BLOCK_AND_DF_ANALYZE instead of
	SPLIT_BLOCK.
	(split_pattern_seq): Likewise.
	(erase_matching_seqs): Likewise.
	(split_pattern_seq): Skip return insn in case of REG_NORETURN note.

	PR testsuite/33009
	* gcc.c-torture/compile/pr11832.c: Check -frtl-abstract-sequences.
	* gcc.c-torture/compile/pr33009.c: Likewise.

From-SVN: r132893