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Re: [dataflow]: patch committed to do incremental scanning of rtl.
- From: Kenneth Zadeck <zadeck at naturalbridge dot com>
- To: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, "Berlin, Daniel" <dberlin at dberlin dot org>, Seongbae Park <seongbae dot park at gmail dot com>, Steven Bosscher <stevenb dot gcc at gmail dot com>
- Date: Sun, 17 Dec 2006 09:14:47 -0500
- Subject: Re: [dataflow]: patch committed to do incremental scanning of rtl.
- References: <45847991.7010200@naturalbridge.com> <45850D3D.1080209@lu.unisi.ch>
Paolo Bonzini wrote:
>
>> 4) Many of the passes use defered scanning. In this mode, a bitmap is
>> kept of the insns that have been changed and at the end of the pass
>> all of the marked insns are rescanned. This is particularly efficient
>> for passes like combine which modify insns many times but do not
>> directly make use of the scanning information. FWprop also uses this
>> technique and has been re-enabled by this patch.
>
> Thank you. I was about to write some thoughts about deferring the
> scan until the end of the pass, but you beat me by a wide margin.
>
> Paolo
Paolo,
Any chance of getting you to look at changing regrename to use df
def-use chains?
Kenny