[llvm-dev] SelectionDAG::LegalizeTypes is very slow in 3.1 version

[Ryan Taylor via llvm-dev]

If you are certain it's the LegalizeTypes (did you isolate it to this?),
diff the versions up, I'm sure you'll find your answer.

-Ryan

On Tue, Sep 27, 2016 at 1:07 PM, xiaoyong liu via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> 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> 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.
>>
>>
>> thanks
>>
>> Xiaoyong
>>
>>
>>
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>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
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