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Re: Question about TCG backend correctness

From: Richard Henderson
Subject: Re: Question about TCG backend correctness
Date: Tue, 18 Oct 2022 15:22:22 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2

On 10/18/22 01:27, LIU Zhiwei wrote:
Maybe I can run RISU on qemu-aarch64(x86) and qemu-aarch64(risc-v) to check the RISC-V backend.

This is a good start for debugging a tcg backend. It's not comprehensive, because RISU executes one instruction at a time then raises an exception to check the results. This means that the tcg optimizer doesn't have much to work with, which means that the tcg backend is not as stressed as it could be.

I've long wanted to have the ability to have TCG unit tests where a
virtual processor could be defined for the purpose of directly
exercising TCG.

We already have many ISAs as the front end of TCG. Will the virtual processor 
here be some

It wouldn't.  This is my argument against creating a new virtual processor.

I do think we should be better about creating regression tests for bugs fixed, in the form of small focused assembly test cases which get run via check-tcg.


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