9c43749dfe
Introduce a new concept in the IR that allows a producer to create dynamic vector types. An IR function can now contain global value(s) that represent a dynamic scaling factor, for a given fixed-width vector type. A dynamic type is then created by 'multiplying' the corresponding global value with a fixed-width type. These new types can be used just like the existing types and the type system has a set of hard-coded dynamic types, such as I32X4XN, which the user defined types map onto. The dynamic types are also used explicitly to create dynamic stack slots, which have no set size like their existing counterparts. New IR instructions are added to access these new stack entities. Currently, during codegen, the dynamic scaling factor has to be lowered to a constant so the dynamic slots do eventually have a compile-time known size, as do spill slots. The current lowering for aarch64 just targets Neon, using a dynamic scale of 1. Copyright (c) 2022, Arm Limited.
29 lines
805 B
Rust
29 lines
805 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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// 0x100-0x17f: Dynamic 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 next highest 4 bits, giving a range of 2-256 lanes.
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// Dynamic vector types are encoded similarily.
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/// Start of the lane types.
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pub const LANE_BASE: u16 = 0x70;
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/// Base for reference types.
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pub const REFERENCE_BASE: u16 = 0x7E;
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/// Start of the 2-lane vector types.
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pub const VECTOR_BASE: u16 = 0x80;
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/// Start of the dynamic vector types.
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pub const DYNAMIC_VECTOR_BASE: u16 = 0x100;
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