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Add riscv_int.h and define int_xlen_t and uint_xlen_t #14

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Add riscv_int.h and define int_xlen_t and uint_xlen_t #14

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40f4f8f
Add riscv_intrinsic.h to define int_xlen_t and uint_xlen_t
kito-cheng Dec 9, 2020
39cad30
Apply suggestions from Nick Knight
kito-cheng Dec 11, 2020
a554836
Rename to riscv_int.h, add riscv prefix and full marco for fixed widt…
kito-cheng Jul 7, 2023
30af6b9
Fix typo
kito-cheng Jul 10, 2023
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28 changes: 28 additions & 0 deletions riscv-c-api.md
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Expand Up @@ -235,6 +235,34 @@ long __riscv_clmul (long a, long b); // clmul rd, rs1, rs2
vint8m1_t __riscv_vadd_vv_i8m1(vint8m1_t vs2, vint8m1_t vs1, size_t vl); // vadd.vv vd, vs2, vs1
```

### riscv_int.h

This header file defined several common RISC-V specific integer type and related
marco could be used in intrinsic interface or user program directly.
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| Type Name | Meaning |
| --------------------- | ------------------------------------ |
| __riscv_int_xlen_t | Two's-complement signed integer type with exactly XLEN bits (no padding bits) |
| __riscv_uint_xlen_t | Unsigned integer type with exactly XLEN bits (no padding bits) |

| Macro Name | Value |
| --------------------- | ------------------------------------ |
| __RISCV_INT_XLEN_MAX | Maximum value of int_xlen_t |
| __RISCV_INT_XLEN_MIN | Minimum value of int_xlen_t |
| __RISCV_UINT_XLEN_MAX | Maximum value of uint_xlen_t |
| __RISCV_PRIdXLEN | Expand to a string literal for use as a `d` print specificier for int_xlen_t/uint_xlen_t. |
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| __RISCV_PRIiXLEN | Expand to a string literal for use as a `i` print specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_PRIoXLEN | Expand to a string literal for use as a `o` print specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_PRIuXLEN | Expand to a string literal for use as a `u` print specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_PRIxXLEN | Expand to a string literal for use as a `x` print specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_PRIXXLEN | Expand to a string literal for use as a `X` print specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_SCNdXLEN | Expand to a string literal for use as a `d` scan specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_SCNiXLEN | Expand to a string literal for use as a `i` scan specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_SCNoXLEN | Expand to a string literal for use as a `o` scan specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_SCNuXLEN | Expand to a string literal for use as a `u` scan specificier for int_xlen_t/uint_xlen_t. |
| __RISCV_SCNxXLEN | Expand to a string literal for use as a `x` scan specificier for int_xlen_t/uint_xlen_t. |


## Constraints on Operands of Inline Assembly Statements

This section lists operand constraints that can be used with inline assembly
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