Re: RFC: LoongArch backend for SBCL

The changes to the shared parts should be in separate commits.
Anything else that's restricted to src/compiler/arch or arch-specific
src/runtime files can be formatted in any way you wish, even just a
single commit.

On Mon, Jan 12, 2026 at 5:36 AM 王子龙 <[email protected]> wrote:
>
> Hello,
>
>
> I am working on adding support for the LoongArch architecture to SBCL
> and would like to ask for early feedback before submitting patches.
>
>
> Target:
> - Architecture: LoongArch64
> - OS: Linux
> - ABI: LoongArch ELF psABI
>
>
> Current status:
> - Backend skeleton is in place
> - Register set and calling convention are defined
> - Basic VOPs are implemented
> - Runtime context handling (sigcontext, PC/GPR access) is implemented
> - SBCL can be built natively on LoongArch Linux
> - Basic tests run; some failures remain
>
>
> Tested on:
> - LoongArch64, Linux kernel 6.3+, glibc 2.36
> - GCC 14.2.1, native build
> - SBCL bootstraps successfully
>
>
> Implementation approach:
> - Backend structure follows the existing MIPS and RISC-V ports
> - Instruction selection and ABI closely follow the official LoongArch ABI
> - Runtime support is implemented in src/runtime/
>
>
> Next steps:
> - Clean up the backend and split changes into logical patches
> - Submit the port incrementally (backend skeleton, ABI, codegen, runtime)
> - Address remaining test failures
>
>
> Before sending patches, I would appreciate any guidance on:
> - Preferred patch ordering
> - Any architectural concerns specific to SBCL backends
>
>
> Thank you for your time and feedback.
>
>
> Best regards,
> ZiLong Wang
>
>
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