RFC: LoongArch backend for SBCL

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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