[llvm-dev] How to add NOP?

[Volkan Keles via llvm-dev]

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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