| Issue |
148147
|
| Summary |
RISC-V backend does not support PreserveMost calling convention
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
CaiWeiran
|
The RISC-V backend currently does not support the `PreserveMost` calling convention. Attempting to compile code that uses it results in a fatal error:
> fatal error: error in backend: Unsupported calling convention
A minimal example can be seen on Compiler Explorer:
https://godbolt.org/z/h7e5WT7eM
This issue raises a few questions:
* Should the RISC-V backend implement support for `PreserveMost`, similar to x86, ARM, and AArch64?
* Alternatively, should the frontend (or mid-end) automatically lower unsupported calling conventions like `PreserveMost` to a more compatible one such as `C`?
It would be helpful to clarify whether support is planned or if users should explicitly avoid using this calling convention on RISC-V targets.
Thanks!
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