llvm dev - Dec 2018 - JIT parameter in createTargetMachine

Dear all,

what does the parameter 'JIT' mean in Target::createTargetMachine ? It
is
not documented here:

http://llvm.org/doxygen/classllvm_1_1Target.html#a3a99d5ba8f023d04d34f652af7494b35

I have ported a rather old code base from llvm 3.x to 7.0 and now I might
be observing a performance regression. I stumbled upon this new parameter
when changing the codemodel and wondered whether it should be set to false
or true  (we use a JIT execution engine).

regards,

Christoph
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Hi Christoph,

If your TargetMachine is being used to generate JIT'd code then the JIT
argument should be set to 'true'.

What target/code-model are you using? Were you able to confirm your
regression?

Cheers,
Lang.

On Mon, Dec 10, 2018 at 11:23 AM Christoph Höger via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Dear all,
>
> what does the parameter 'JIT' mean in Target::createTargetMachine ?
It is
> not documented here:
>
>
>
http://llvm.org/doxygen/classllvm_1_1Target.html#a3a99d5ba8f023d04d34f652af7494b35
>
> I have ported a rather old code base from llvm 3.x to 7.0 and now I might
> be observing a performance regression. I stumbled upon this new parameter
> when changing the codemodel and wondered whether it should be set to false
> or true  (we use a JIT execution engine).
>
> regards,
>
> Christoph
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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