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