[llvm-dev] How to add NOP?

[Volkan Keles via llvm-dev]

Use MachineInstr::memoperands() function to get memory operands then you
can get the address space by using MachineMemOperand::getAddrSpace().

Volkan

On Tue, Sep 15, 2015 at 11:40 PM Erdem Derebaşoğlu <
erdemderebasoglu at hotmail.com> wrote:

> Thanks for the response. How can I find out if an instruction uses a
> private memory access?
>
> Erdem
> ------------------------------
> From: vlknkls at gmail.com
> Date: Tue, 15 Sep 2015 14:38:16 +0000
> Subject: Re: [llvm-dev] How to add NOP?
> To: erdemderebasoglu at hotmail.com; llvm-dev at lists.llvm.org
>
>
> Hi Erdem,
>
> I would write a MachineFunction pass. You can check each load instruction
> to see if it is a private memory access and insert what you want by using
> BuildMI(...) function.
>
> Volkan
>
> On Tue, Sep 15, 2015 at 4:16 AM Erdem Derebaşoğlu <llvm-dev at lists.llvm.org>
> wrote:
>
> I would like to convert a C file that uses OpenMP library to X86 code with
> a condition: I want to insert a NOP before each instruction that does a
> private memory access.
> I have written an optimization pass that inserts an inline assembly call
> (NOP) but it is applied at IR level, and I cannot determine where to insert
> it. How can I use LLVM to add NOPs accordingly?
>
> Thanks.
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>
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