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Re: Proposal for path splitting for reduction in register pressure for Loops.

From: Jeff Law <law at redhat dot com>
To: Richard Biener <richard dot guenther at gmail dot com>, Ajit Kumar Agarwal <ajit dot kumar dot agarwal at xilinx dot com>, "vmakarov at redhat dot com" <vmakarov at redhat dot com>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
Cc: Vinod Kathail <vinodk at xilinx dot com>, Shail Aditya Gupta <shailadi at xilinx dot com>, Vidhumouli Hunsigida <vidhum at xilinx dot com>, Nagaraju Mekala <nmekala at xilinx dot com>
Date: Sun, 08 Mar 2015 13:49:42 -0600
Subject: Re: Proposal for path splitting for reduction in register pressure for Loops.
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References: <BN1AFFO11OLC004D84D26C6A4468398AD3DAE1A0 at BN1AFFO11OLC004 dot protection dot gbl> <7A0E44F9-1DB4-44C6-85C6-B8DF48E5B589 at gmail dot com> <BY2FFO11OLC0045AF32468170562DF25ACAE1A0 at BY2FFO11OLC004 dot protection dot gbl> <D6FE4994-7C21-49EB-8398-1C940F536C09 at gmail dot com>

On 03/08/15 12:13, Richard Biener wrote:


I see.  This basically creates two loop latches and thus will make our loop detection code turn the loop into a fake loop nest.  Not sure if that is a good idea.

I'd have to sit down and ponder this for a while -- what would be theregister pressure implications of duplicating the contents of the joinblock into its predecessors, leaving an empty joiner so that we stillhave a single latch?


Jeff

Follow-Ups:
- Re: Proposal for path splitting for reduction in register pressure for Loops.
  - From: Richard Biener

References:
- Proposal for path splitting for reduction in register pressure for Loops.
  - From: Ajit Kumar Agarwal
- Re: Proposal for path splitting for reduction in register pressure for Loops.
  - From: Richard Biener
- RE: Proposal for path splitting for reduction in register pressure for Loops.
  - From: Ajit Kumar Agarwal
- RE: Proposal for path splitting for reduction in register pressure for Loops.
  - From: Richard Biener

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