[llvm-dev] Interpreter and arithmetic overflow intrinsics

[Philip Reames via llvm-dev]

To my knowledge, the IR interpeter has not been actively maintained for 
several years.  Fixing this particular issue would be straight forward, 
and your certainly welcome to contribute a patch, but I'd suggest taking 
a step back and asking why you want to use the IR interpreter at all.  
What use case are you solving? There may be a better option available.

Philip

On 9/19/19 4:56 AM, Sorav Bansal via llvm-dev wrote:
> Hi all,
>
> I am trying to run LLI on an optimized bitcode file in interpreted
> mode, and I get the following error message:
>
> LLVM ERROR: Code generator does not support intrinsic function
> 'llvm.usub.with.overflow.i32'!
>
> As the error message indicates, this intrinsic is not supported
> (lib/CodeGen/IntrinsicLowering.cpp).  Is there any way that I can get
> the interpreter to work across this intrinsic?  I am happy to dig into
> the LLVM source code to fix this if required, but want to understand
> if there are some fundamental difficulties in supporting something
> like this or not.  If not, what is the easiest way of adding this
> support?
>
> thanks,
>
> Sorav
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