llvm dev - Mar 2019 - get Optimization Level options

Hi All,

I want to use Optimization Level options in tailDuplicate() API from
TailDuplicator.cpp file to restrict splice() function.

With -Oz option this splice() API is duplicating the RET instruction in
predecessor blocks.

Could anyone please give your suggestions to get OPTLevel Options(which object
will carry OptLevel Options in this stage?) in this level.

Thanks & Regards,
Ramakota Reddy.


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Hi Ramakota,

On Wed, 20 Mar 2019 at 10:59, Ramakota Reddy via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> With -Oz option this splice() API is duplicating the RET instruction in
predecessor blocks.
-Oz is handled slightly differently from the numeric options. It gets
attached to the function as an attribute that you can check for with
Function::optForMinSize.
> Could anyone please give your suggestions to get OPTLevel Options(which
object will carry OptLevel Options in this stage?) in this level.
This looks like it's known by the PassManagerBuilder and given to the
constructor of any pass that needs it. Mostly it just configures what
passes are run at all though.

Cheers.


Tim.

Thanks a lot Tim for your suggestions.

With Regards,
Ramakota.

-----Original Message-----
From: Tim Northover <t.p.northover at gmail.com>
Sent: Wednesday, March 20, 2019 6:52 PM
To: Ramakota Reddy <Ramakota.Reddy at arm.com>
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] get Optimization Level options

Hi Ramakota,

On Wed, 20 Mar 2019 at 10:59, Ramakota Reddy via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> With -Oz option this splice() API is duplicating the RET instruction in
predecessor blocks.
-Oz is handled slightly differently from the numeric options. It gets attached
to the function as an attribute that you can check for with
Function::optForMinSize.
> Could anyone please give your suggestions to get OPTLevel Options(which
object will carry OptLevel Options in this stage?) in this level.
This looks like it's known by the PassManagerBuilder and given to the
constructor of any pass that needs it. Mostly it just configures what passes are
run at all though.

Cheers.


Tim.
IMPORTANT NOTICE: The contents of this email and any attachments are
confidential and may also be privileged. If you are not the intended recipient,
please notify the sender immediately and do not disclose the contents to any
other person, use it for any purpose, or store or copy the information in any
medium. Thank you.