[llvm-dev] SelectionDAG::LegalizeTypes is very slow in 3.1 version
xiaoyong liu via llvm-dev
llvm-dev at lists.llvm.org
Tue Sep 27 10:07:54 PDT 2016
Absolutely, James. I was with LLVM from very beginning. And keep everything up-to-date.
The background is the new product was inherited. It took time to upgrade.
To the problem: If anyone meet the similar issue, pls kindly share.
From: James Y Knight <jyknight at google.com>
Sent: Tuesday, September 27, 2016 8:25:55 AM
To: xiaoyong liu
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] SelectionDAG::LegalizeTypes is very slow in 3.1 version
You realize 3.1 was released **4 years ago**, and that there's been more than 50,000 commits to llvm since then (not even including commits to clang and other pieces!), right?
On Tue, Sep 27, 2016 at 2:20 AM, xiaoyong liu via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
In 3.1, the backend is very slow to legalize types.
Following is the code snippet which may be the culprit:
%Result.i.i.i97 = alloca i33, align 8
%Result.i.i.i96= alloca i33, align 8
%Result.i.i.i95 = alloca i33, align 8
%Result.i.i.i94 = alloca i33, align 8
%Result.i.i.i93 = alloca i33, align 8
%Result.i.i.i92= alloca i33, align 8
%Result.i.i.i91 = alloca i33, align 8
%Result.i.i.i90 = alloca i33, align 8
%Result.i.i.i89 = alloca i33, align 8
The compilation time improve significant if running on LLVM 3.9. Unfortunately, it's not a choice for me now to upgrade it to 3.9.
If anyone luckily to know what's the evolution in this area to improve the compilation time performance, pls kindly comments.
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