[llvm-dev] how to verify completeness of the llvm backend

[Hal Finkel via llvm-dev]

Hi Vivek,

We don't have a fool-proof way to do this. I recommend that you look at 
the llvm-stress tool. Run through the regression tests in 
test/CodeGen/Generic. Also, if you can fully self host (including 
libc++, etc.) that's a good sign.

  -Hal


On 02/01/2017 10:58 AM, vivek pandya via llvm-dev wrote:
> Hello LLVM Devs,
>
> I have a question regarding porting a new target to LLVM backend.
> When we write a llvm backend for any new architecture then how can we 
> verify that each type of instructions are being generated i.e 
> particular pattern is not missing or not handled properly, every 
> possible addressing modes are getting generated etc ?
>
> One way is that generally architecture developer team should provide 
> set of benchmarks that can cover complete set of instructions for one 
> compiler other than LLVM  but have you ever heard about any tool to 
> check so? Or what is the industry standard practice that you guys 
> follow or know?
>
> For a tool very natural idea is write a script which does string 
> processing to find unique instructions generated over a given 
> benchmark. But Will it be possible to write tool which is generic 
> enough to take LLVM's target description files as input and then 
> perform certain check over generated assembly ?
>
> Sincerely,
> Vivek
>
>
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-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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