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Possible enhancement for RTL data flow?

From: "Bin.Cheng" <amker dot cheng at gmail dot com>
To: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Date: Wed, 8 Jan 2014 11:52:25 +0800
Subject: Possible enhancement for RTL data flow?
Authentication-results: sourceware.org; auth=none

Hi,
I noticed function df_insn_rescan always deletes and re-computes
insn_info if any one of defs/uses/eq_uses/mw is verified changed by
df_insn_refs_verify, even in some passes (like fwprop), the defs are
never changed.  Could it be improved to only update the changed part
(especially we have df_refs_add_to_chains which already does such
thing)?

Thanks,
bin

-- 
Best Regards.

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