cranelift_codegen_shared/
constants.rs

1//! This module contains constants that are shared between the codegen and the meta crate, so they
2//! are kept in sync.
3
4// Numbering scheme for value types:
5//
6// 0: Void
7// 0x01-0x6f: Special types
8// 0x70-0x7d: Lane types
9// 0x7e-0x7f: Reference types
10// 0x80-0xff: Vector types
11// 0x100-0x17f: Dynamic Vector types
12//
13// Vector types are encoded with the lane type in the low 4 bits and log2(lanes)
14// in the next highest 4 bits, giving a range of 2-256 lanes.
15
16// Dynamic vector types are encoded similarly.
17
18/// Start of the lane types.
19pub const LANE_BASE: u16 = 0x70;
20
21/// Base for reference types.
22pub const REFERENCE_BASE: u16 = 0x7E;
23
24/// Start of the 2-lane vector types.
25pub const VECTOR_BASE: u16 = 0x80;
26
27/// Start of the dynamic vector types.
28pub const DYNAMIC_VECTOR_BASE: u16 = 0x100;