| Issue |
148146
|
| 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 backend error:
```
fatal error: error in backend: Unsupported calling convention
```
**Minimal example (on Compiler Explorer):**
https://godbolt.org/z/h7e5WT7eM
---
### Questions
- Should the RISC-V backend **implement support** for `PreserveMost`, similar to backends like x86, ARM, and AArch64?
- Or 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 this is a planned feature, or if `PreserveMost` should be explicitly avoided on RISC-V targets.
Thanks!
```
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