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Function attribute for standard vector calling convention variant: riscv_vector_cc #67

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Apr 15, 2024
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Function attribute for standard vector calling convention variant: riscv_vector_cc #67

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Function attribute for standard vector calling convention variant: ri…
kito-cheng Feb 1, 2024
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Add C++11 and C23 style syntax for riscv_vector_cc
kito-cheng Feb 2, 2024
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13 changes: 13 additions & 0 deletions riscv-c-api.md
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Original file line number Diff line number Diff line change
Expand Up @@ -318,6 +318,19 @@ __attribute__((target("arch=+v"))) int foo(void) { return 0; }
__attribute__((target("arch=+zbb"))) int foo(void) { return 1; }
```

### riscv_vector_cc

Supported Syntaxes:
| Style | Syntax |
| ------ | ----------------------------------- |
| GNU | `__attribute__((riscv_vector_cc)))` |
| C++11 | `[[riscv::vector_cc]]` |
| C23 | `[[riscv::vector_cc]]` |

Functions declared with this attribute will use to the standard vector calling
convention variant as defined in the RISC-V psABI, even if the function has
vector arguments or a return value.

## Intrinsic Functions

Intrinsic functions (or intrinsics or built-ins) are expanded into instruction sequences by compilers.
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