[llvm-dev] testing a back-end pre-emit pass

[Matthias Braun via llvm-dev]

Try to create a .mir test and use "llc -start-after PASSNAME".

BTW: If you want to review a patch that adds -start-before: https://reviews.llvm.org/D23089 <https://reviews.llvm.org/D23089>

- Matthias

> On Aug 5, 2016, at 4:08 AM, Chris.Dewhurst via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi,
> 
> I've been trying all sorts of things to be able to resolve this, but I can't find way to get this done.
> 
> Does anyone know how I might introduce a transform at the ASM level?
> 
> Chris.
> From: Chris.Dewhurst
> Sent: 01 August 2016 16:46
> To: llvm-dev at lists.llvm.org
> Subject: testing a back-end pre-emit pass
> 
> Hi,
> 
> Does anyone have any direction for me on testing a back-end pre-emit pass independently of other passes? The pass I'm looking at is a MachineFunctionPass, so the code is already using target-specific instructions.
> 
> What I'm really looking to do is to see that the pass is correctly converting certain target-specific instructions sequences into other sequences, but I'm unsure how I can get an input in the correct format to construct a good unit test. Can I generate an ".ll" file using target specific instructions and then pass it through to a back-end MachineFunctionPass to test specifically just that one pass?
> 
> Chris Dewhurst,
> Lero, University of Limerick.
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