[llvm-dev] [RFC] Enhance Partial Inliner by using a general outlining scheme for cold blocks
Graham Yiu via llvm-dev
llvm-dev at lists.llvm.org
Fri Aug 25 11:56:52 PDT 2017
Hey Kader,
So I'm not sure what you mean by what type of subgraphs. The cold regions
would be outlined into its own function (assuming single entry, single
exit), and there could be multiple regions we outline from a single
function. I currently have a prototype that can do this type of outlining
without modifying the CodeExtractor, but the FunctionCloner needed some
changes to track multiple outline functions and its corresponding in the
parent function.
Graham Yiu
LLVM Compiler Development
IBM Toronto Software Lab
Office: (905) 413-4077 C2-707/8200/Markham
Email: gyiu at ca.ibm.com
From: keita abdoul-kader via llvm-dev <llvm-dev at lists.llvm.org>
To: llvm-dev at lists.llvm.org
Date: 08/25/2017 12:48 PM
Subject: [llvm-dev] [RFC] Enhance Partial Inliner by using a general
outlining scheme for cold blocks
Sent by: "llvm-dev" <llvm-dev-bounces at lists.llvm.org>
Hello Graham,
We are also starting some work in the general direction of
outlining/function splitting using profiling information. In our case, we
are focusing on splitting functions into smaller parts to allow for a
better code layout and thus better Icache/ITLB utilization.
It wasn't clear to me from your description what type of subgraphs those
cold regions would generate, and whether you would need to extend the code
in CodeExtractor.h/FunctionCloner to support those.
Abdoul-kader keita,
Compiler Engineering @ Facebook, Inc
Thanks,
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