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diff --git a/doc/zjit.md b/doc/zjit.md index 86a27d7119..b7a3e1827c 100644 --- a/doc/zjit.md +++ b/doc/zjit.md @@ -179,26 +179,26 @@ This glossary contains terms that are helpful for understanding ZJIT. Please note that some terms may appear in CRuby internals too but with different meanings. -| Term | Definition | -| --- | -----------| -| HIR | High-level Intermediate Representation. High-level (Ruby semantics) graph representation in static single-assignment (SSA) form | -| LIR | Low-level Intermediate Representation. Low-level IR used in the backend for assembly generation | -| SSA | Static Single Assignment. A form where each variable is assigned exactly once | -| `opnd` | Operand. An operand to an IR instruction (can be register, memory, immediate, etc.) | -| `dst` | Destination. The output operand of an instruction where the result is stored | -| VReg | Virtual Register. A virtual register that gets lowered to physical register or memory | -| `insn_id` | Instruction ID. An index of an instruction in a function | -| `block_id` | The index of a basic block, which effectively acts like a pointer | -| `branch` | Control flow edge between basic blocks in the compiled code | -| `cb` | Code Block. Memory region for generated machine code | -| `entry` | The starting address of compiled code for an ISEQ | -| Patch Point | Location in generated code that can be modified later in case assumptions get invalidated | -| Frame State | Captured state of the Ruby stack frame at a specific point for deoptimization | -| Guard | A run-time check that ensures assumptions are still valid | -| `invariant` | An assumption that JIT code relies on, requiring invalidation if broken | -| Deopt | Deoptimization. Process of falling back from JIT code to interpreter | -| Side Exit | Exit from JIT code back to interpreter | -| Type Lattice | Hierarchy of types used for type inference and optimization | -| Constant Folding | Optimization that evaluates constant expressions at compile time | -| RSP | x86-64 stack pointer register used for native stack operations | -| Register Spilling | Process of moving register values to memory when running out of physical registers | +| Term | Definition | +| ----------------- | ------------------------------------------------------------------------------------------------------------------------------- | +| HIR | High-level Intermediate Representation. High-level (Ruby semantics) graph representation in static single-assignment (SSA) form | +| LIR | Low-level Intermediate Representation. Low-level IR used in the backend for assembly generation | +| SSA | Static Single Assignment. A form where each variable is assigned exactly once | +| `opnd` | Operand. An operand to an IR instruction (can be register, memory, immediate, etc.) | +| `dst` | Destination. The output operand of an instruction where the result is stored | +| VReg | Virtual Register. A virtual register that gets lowered to physical register or memory | +| `insn_id` | Instruction ID. An index of an instruction in a function | +| `block_id` | The index of a basic block, which effectively acts like a pointer | +| `branch` | Control flow edge between basic blocks in the compiled code | +| `cb` | Code Block. Memory region for generated machine code | +| `entry` | The starting address of compiled code for an ISEQ | +| Patch Point | Location in generated code that can be modified later in case assumptions get invalidated | +| Frame State | Captured state of the Ruby stack frame at a specific point for deoptimization | +| Guard | A run-time check that ensures assumptions are still valid | +| `invariant` | An assumption that JIT code relies on, requiring invalidation if broken | +| Deopt | Deoptimization. Process of falling back from JIT code to interpreter | +| Side Exit | Exit from JIT code back to interpreter | +| Type Lattice | Hierarchy of types used for type inference and optimization | +| Constant Folding | Optimization that evaluates constant expressions at compile time | +| RSP | x86-64 stack pointer register used for native stack operations | +| Register Spilling | Process of moving register values to memory when running out of physical registers | |