[llvm-dev] No vectorization with -loop-vectorize and -slp-vectorizer

[hameeza ahmed via llvm-dev]

Thank You.
I used following commands

Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang -O1
-Xclang -disable-O0-optnone  -emit-llvm -S vecsum.c -o vecsum-noopt.ll
Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt
 -loop-vectorize -slp-vectorizer -S vecsum-noopt.ll -o vecto.ll

It vectorized the code.

On Mon, Oct 14, 2019 at 2:33 PM HAPPY Mahto <cs17btech11018 at iith.ac.in>
wrote:

>
>
> On Mon, Oct 14, 2019 at 2:52 PM hameeza ahmed via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hello,
>> I am trying to test individual optimizations of opt on unoptimized IR.
>> But, the IR is not getting vectorized by using following commands.
>>
>> Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang -O1
>> -Xclang -disable-llvm-passes -emit-llvm -S vecsum.c -o vecsum-noopt.ll
>>
>>
> Try this:
> Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang -O1
> -Xclang -disable-00-optnone -disable-llvm-passes -emit-llvm -S vecsum.c -o
> vecsum-noopt.ll
> Same for other commands too.
> You need to add '-disable-00-optnone' flag, or you can remove the optnone
> attribute from attributes #0 = { noinline , nounwind, optnone ... }
> I hope this helps.
>
> -Happy
>
> Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/opt
>> -loop-vectorize -slp-vectorizer -S vecsum-noopt.ll -o vecto.ll
>>
>> Though IR gets vectorized with O3 flag. Even I tried to replicate O3
>> behavior via individual flags with opt. But It is not showing same IR.
>>
>> Where am I doing mistake?
>>
>> Please help
>>
>> Thank You
>> Regards
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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