e4a733d5b2
git-subtree-dir: externals/biscuit git-subtree-split: 1d53c9e6cfe56544982200a5bac15a5de064936b
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
#pragma once
|
|
|
|
#include <cstdint>
|
|
|
|
// Source file for anything specific to the RISC-V vector extension.
|
|
|
|
namespace biscuit {
|
|
|
|
/// Describes whether or not an instruction should make use of the mask vector.
|
|
enum class VecMask : uint32_t {
|
|
Yes = 0,
|
|
No = 1,
|
|
};
|
|
|
|
/// Describes the selected element width.
|
|
enum class SEW : uint32_t {
|
|
E8 = 0b000, // 8-bit vector elements
|
|
E16 = 0b001, // 16-bit vector elements
|
|
E32 = 0b010, // 32-bit vector elements
|
|
E64 = 0b011, // 64-bit vector elements
|
|
E128 = 0b100, // 128-bit vector elements
|
|
E256 = 0b101, // 256-bit vector elements
|
|
E512 = 0b110, // 512-bit vector elements
|
|
E1024 = 0b111, // 1024-bit vector elements
|
|
};
|
|
|
|
/// Describes the selected register group multiplier.
|
|
enum class LMUL : uint32_t {
|
|
M1 = 0b000, // Group of one vector
|
|
M2 = 0b001, // Groups of two vectors
|
|
M4 = 0b010, // Groups of four vectors
|
|
M8 = 0b011, // Groups of eight vectors
|
|
MF8 = 0b101, // Fractional vector group (1/8)
|
|
MF4 = 0b110, // Fractional vector group (1/4)
|
|
MF2 = 0b111, // Fractional vector group (1/2)
|
|
};
|
|
|
|
/**
|
|
* Describes whether or not vector masks are agnostic.
|
|
*
|
|
* From the RVV spec:
|
|
*
|
|
* When a set is marked undisturbed, the corresponding set of
|
|
* destination elements in a vector register group retain the
|
|
* value they previously held.
|
|
*
|
|
* When a set is marked agnostic, the corresponding set of destination
|
|
* elements in any vector destination operand can either retain the value
|
|
* they previously held, or are overwritten with 1s.
|
|
*
|
|
* Within a single vector instruction, each destination element can be either
|
|
* left undisturbed or overwritten with 1s, in any combination, and the pattern
|
|
* of undisturbed or overwritten with 1s is not required to be deterministic when
|
|
* the instruction is executed with the same inputs. In addition, except for
|
|
* mask load instructions, any element in the tail of a mask result can also be
|
|
* written with the value the mask-producing operation would have calculated with vl=VLMAX
|
|
*/
|
|
enum class VMA : uint32_t {
|
|
No, // Undisturbed
|
|
Yes, // Agnostic
|
|
};
|
|
|
|
/**
|
|
* Describes whether or not vector tail elements are agnostic.
|
|
*
|
|
* From the RVV spec:
|
|
*
|
|
* When a set is marked undisturbed, the corresponding set of
|
|
* destination elements in a vector register group retain the
|
|
* value they previously held.
|
|
*
|
|
* When a set is marked agnostic, the corresponding set of destination
|
|
* elements in any vector destination operand can either retain the value
|
|
* they previously held, or are overwritten with 1s.
|
|
*
|
|
* Within a single vector instruction, each destination element can be either
|
|
* left undisturbed or overwritten with 1s, in any combination, and the pattern
|
|
* of undisturbed or overwritten with 1s is not required to be deterministic when
|
|
* the instruction is executed with the same inputs. In addition, except for
|
|
* mask load instructions, any element in the tail of a mask result can also be
|
|
* written with the value the mask-producing operation would have calculated with vl=VLMAX
|
|
*/
|
|
enum class VTA : uint32_t {
|
|
No, // Undisturbed
|
|
Yes, // Agnostic
|
|
};
|
|
|
|
} // namespace biscuit
|