llvm dev - Mar 2019 - Replace all memory access with registry access

Hi,
Thanks for getting back to me. I'd like to understand if it possible to
avoid instructions that relies on memory address and instead have all the
necessary data inside registers. I think this would simplify a lot analysis
on the LLVM IR..

Thanks again

On Wed, Mar 6, 2019, 18:23 Vedant Kumar <vsk at apple.com> wrote:
> Hi,
>
> Could you share some more details about what you're trying to
accomplish?
>
> Generally speaking, some instructions necessarily load/store from/to
> memory (e.g. updates to a shared memory region).
>
> best,
> vedant
>
> > On Mar 6, 2019, at 9:37 AM, Alberto Barbaro via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hi all,
> > Is there any way for converting any instruction that is loading or
> storing in memory into an instruction that just deal with registries?
> >
> > I'm not even sure if it is possible. Any suggestion?
> >
> > Thanks
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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What you are probably looking for are the mem2reg pass and scalar replacement of
aggregates (SROA) pass, which includes a more aggressive version of mem2reg.
These passes try to eliminate alloca instructions by converting the stack
variables to registers when possible.

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Alberto
Barbaro via llvm-dev
Sent: Wednesday, March 6, 2019 14:48
To: Vedant Kumar <vsk at apple.com>
Cc: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Replace all memory access with registry access

Hi,
Thanks for getting back to me. I'd like to understand if it possible to
avoid instructions that relies on memory address and instead have all the
necessary data inside registers. I think this would simplify a lot analysis on
the LLVM IR..

Thanks again

On Wed, Mar 6, 2019, 18:23 Vedant Kumar <vsk at apple.com<mailto:vsk at
apple.com>> wrote:
Hi,

Could you share some more details about what you're trying to accomplish?

Generally speaking, some instructions necessarily load/store from/to memory
(e.g. updates to a shared memory region).

best,
vedant
> On Mar 6, 2019, at 9:37 AM, Alberto Barbaro via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
>
> Hi all,
> Is there any way for converting any instruction that is loading or storing
in memory into an instruction that just deal with registries?
>
> I'm not even sure if it is possible. Any suggestion?
>
> Thanks
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Hi all,
Thanks for your help with this. I'll try what you suggested.

Appreciated

On Wed, Mar 6, 2019, 20:03 Cranmer, Joshua <joshua.cranmer at intel.com>
wrote:
> What you are probably looking for are the mem2reg pass and scalar
> replacement of aggregates (SROA) pass, which includes a more aggressive
> version of mem2reg. These passes try to eliminate alloca instructions by
> converting the stack variables to registers when possible.
>
>
>
> *From:* llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] *On Behalf Of
*Alberto
> Barbaro via llvm-dev
> *Sent:* Wednesday, March 6, 2019 14:48
> *To:* Vedant Kumar <vsk at apple.com>
> *Cc:* llvm-dev <llvm-dev at lists.llvm.org>
> *Subject:* Re: [llvm-dev] Replace all memory access with registry access
>
>
>
> Hi,
>
> Thanks for getting back to me. I'd like to understand if it possible to
> avoid instructions that relies on memory address and instead have all the
> necessary data inside registers. I think this would simplify a lot analysis
> on the LLVM IR..
>
>
>
> Thanks again
>
>
>
> On Wed, Mar 6, 2019, 18:23 Vedant Kumar <vsk at apple.com> wrote:
>
> Hi,
>
> Could you share some more details about what you're trying to
accomplish?
>
> Generally speaking, some instructions necessarily load/store from/to
> memory (e.g. updates to a shared memory region).
>
> best,
> vedant
>
> > On Mar 6, 2019, at 9:37 AM, Alberto Barbaro via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hi all,
> > Is there any way for converting any instruction that is loading or
> storing in memory into an instruction that just deal with registries?
> >
> > I'm not even sure if it is possible. Any suggestion?
> >
> > Thanks
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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