[PATCH] Fix PR33009, -frtl-abstract-sequences causes an infinite loop

[Gabor Loki]

Hi,

This patch fixes the PR33009 for rtl-factoring.c.
The infinite loop problem comes from the merge of dataflow branch.

My next mail will contain two gcc.c-torture/compile tests for
-frtl-abstract-sequences, in order not to let such thing happen again.

Bootstrapped and regtested on i686-linux-gnu.
Ok for trunk?

--Gabor


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

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


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