| //! This module contains constants that are shared between the codegen and the meta crate, so they |
| //! are kept in sync. |
| |
| // Numbering scheme for value types: |
| // |
| // 0: Void |
| // 0x01-0x6f: Special types |
| // 0x70-0x7d: Lane types |
| // 0x7e-0x7f: Reference types |
| // 0x80-0xff: Vector types |
| // |
| // Vector types are encoded with the lane type in the low 4 bits and log2(lanes) |
| // in the high 4 bits, giving a range of 2-256 lanes. |
| |
| /// Start of the lane types. |
| pub const LANE_BASE: u8 = 0x70; |
| |
| /// Base for reference types. |
| pub const REFERENCE_BASE: u8 = 0x7E; |
| |
| /// Start of the 2-lane vector types. |
| pub const VECTOR_BASE: u8 = 0x80; |
| |
| // Some constants about register classes and types. |
| |
| /// Guaranteed maximum number of top-level register classes with pressure tracking in any ISA. |
| pub const MAX_TRACKED_TOP_RCS: usize = 4; |
| |
| /// Guaranteed maximum number of register classes in any ISA. |
| pub const MAX_NUM_REG_CLASSES: usize = 32; |
