RISC-V Compiler Explorer (riscv32, riscv64, x86-32 and x86-64)

[Michael Clark]

Hi,

Let me know if this link works and if the performance is usable:

- https://cx.rv8.io/g/AnaUnz

I’ve set up Matt Godbolt’s compiler-explorer on a Google Cloud f1.micro instance.

The instance has an experimental musl-riscv gcc 7.1.0 toolchain for riscv32, riscv64, x86-32 and x86-64

- https://github.com/rv8-io/musl-riscv-toolchain/releases/tag/v7.1.0-2

We can use it in the meantime until Matt sets up some riscv toolchains (newlib, gcc) on godbolt.org.

Michael.

[Bruce Hoult]

I'm sure the speed is fine.

Can it show machine code hex, and have different -march options?

Michael.

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[Michael Clark]

Hi Bruce,

You can add -march options in the compiler switches command line area at the top right of each compiler window.

I'm not sure about how to configure compiler-explorer to show instruction words in the output. There is a global config option for objdump which I've not set. I have a feeling from looking at the config examples that I might need to point it at a shell script that does file and invokes the architecture specific objdump as it is a global. Matt's AWS example config points at a special objdump.

The default config btw is to just locate the compilers on the host machine. I had to look at some of Matt's AWS config examples to figure out how to get it working with multiple architectures. e.g. using the compiler group feature.

It also requires a google API key to get the URL shortener to work which took me a while to figure out as that is also off by default. I had to enable the API and configure an API key in the Google Developer console.

There is also an LD_PRELOAD compiler wrapper that is off by default which is likely there to harden the setup for the cloud. I thought I switched on that option.

It was quite easy to set up. I guess adding ARM32 and ARM64 might be possible... it took ages to upload the toolchain and the machine is too meagre to actually build a toolchain.

It would be kinda nice to have on the riscv.org domain although it likely needs to be sandboxed from other apps. The only thing I have on that box is an SSL proxy to enable https on GitHub pages (as GitHub don't seem to have letsencrypt configured if you use a custom domain for GitHub pages). I reused the apache https proxy config as by default node binds to an ephemeral port serving http. Secure compiler snippets. :-D

Michael

Sent from my iPhone

[Bruce Hoult]

> It was quite easy to set up. I guess adding ARM32 and ARM64 might be

> possible... it took ages to upload the toolchain and the machine is too

> meagre to actually build a toolchain.

Once you have your AWS disk images, it's easy enough to crank up a c4.8xlarge spot instance for about 40c/hour (36 threads, 60 GB RAM) using the same disk images (or temporary ones and scp the results across)

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