[llvm-dev] Replace all memory access with registry access

[Cranmer, Joshua via llvm-dev]

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
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