[llvm-dev] Computing unique ID of IR instructions that can be mapped back

[George Burgess IV via llvm-dev]

> Isn't Instruction* a pointer to the instruction in memory? If so, it'll
change across runs

Correct, but none of this is meant to be stored across runs, so the actual
address doesn't matter. You recompute the map every time your IR is loaded.

On Mon, May 8, 2017 at 7:34 PM, Dipanjan Das via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
>
> On 8 May 2017 at 18:14, Jonathan Roelofs <jonathan at codesourcery.com>
> wrote:
>
>> An alternative way to do it, which would be less invasive and more
>> upstreaming friendly, would be to implement this as an analysis pass.
>>
>> In the pass, calculate a map<Instruction*,ID>, and use that as the
>> analysis result. Then query that result for the ID where you need it. If
>> you've written the analysis correctly, then you'll always get the same IDs
>> for the same instructions given the same input IR.
>>
>
> Isn't Instruction* a pointer to the instruction in memory? If so, it'll
> change across runs.
>
>
> --
>
> Thanks & Regards,
> Dipanjan
>
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