ladybird/Libraries/LibJS/Bytecode
Andreas Kling 31606fddd3 LibJS: Add Mov2/Mov3 instructions to reduce dispatch overhead
Add Mov2 and Mov3 bytecode instructions that perform 2 or 3 register
moves in a single dispatch. A peephole optimization pass during
bytecode assembly merges consecutive Mov instructions within each
basic block into these combined instructions.

When merging, identical Movs are deduplicated (e.g. two identical Movs
become a single Mov, not a Mov2). This optimization is implemented in
both the C++ and Rust codegen pipelines.

The goal is to reduce the per-instruction dispatch overhead, which is
significant compared to the actual cost of moving a value.

This isn't fancy or elegant, but provides a real speed-up on many
workloads. As an example, Kraken/imaging-desaturate.js improves by
~1.07x on my laptop.
2026-03-11 17:04:32 +01:00
..
AsmInterpreter LibJS: Add Mov2/Mov3 instructions to reduce dispatch overhead 2026-03-11 17:04:32 +01:00
ASTCodegen.cpp LibJS: Copy LHS of binary expression to preserve evaluation order 2026-03-08 15:01:07 +01:00
BasicBlock.cpp LibJS: Stop worrying about Instruction destructors 2025-11-21 09:46:03 +01:00
BasicBlock.h LibJS: Collapse handler/finalizer into single exception handler target 2026-02-09 16:35:39 +01:00
BuiltinAbstractOperationsEnabled.h LibJS: Introduce NativeJavaScriptBackedFunction 2025-11-30 11:54:54 +01:00
Builtins.cpp Everywhere: Hoist the Libraries folder to the top-level 2024-11-10 12:50:45 +01:00
Builtins.h LibJS: Skip generic call when using regexp builtins in StringPrototype 2025-12-13 13:51:12 -06:00
Bytecode.def LibJS: Add Mov2/Mov3 instructions to reduce dispatch overhead 2026-03-11 17:04:32 +01:00
ClassBlueprint.h LibJS: Add ClassBlueprint data structures 2026-02-11 23:57:41 +01:00
Executable.cpp LibJS: Move source range cache from ExecutionContext to Executable 2026-03-11 13:33:47 +01:00
Executable.h LibJS: Move source range cache from ExecutionContext to Executable 2026-03-11 13:33:47 +01:00
FormatOperand.h LibJS: Flatten Operand to 32-bit index in bytecode instruction stream 2025-12-09 21:44:13 -06:00
Generator.cpp LibJS: Add Mov2/Mov3 instructions to reduce dispatch overhead 2026-03-11 17:04:32 +01:00
Generator.h LibJS: Consolidate TDZ check emission into Generator helper 2026-02-17 20:44:57 +01:00
IdentifierTable.cpp LibJS+LibWeb+WebContent: Port JS::PropertyKey to UTF-16 2025-08-05 07:07:15 -04:00
IdentifierTable.h LibJS: Give Interpreter a direct pointer to the identifier table 2025-10-07 23:50:51 +02:00
Instruction.cpp LibJS: Flatten Operand to 32-bit index in bytecode instruction stream 2025-12-09 21:44:13 -06:00
Instruction.h Meta: Reformat QtCreator file-listing script for readability 2026-02-23 13:10:03 +01:00
Interpreter.cpp LibJS: Add Mov2/Mov3 instructions to reduce dispatch overhead 2026-03-11 17:04:32 +01:00
Interpreter.h LibJS: Remove derivable fields from ExecutionContext 2026-03-11 13:33:47 +01:00
Label.cpp Everywhere: Hoist the Libraries folder to the top-level 2024-11-10 12:50:45 +01:00
Label.h LibJS: Revert Enable EXPLICIT_SYMBOL_EXPORT 2025-07-22 11:51:29 -04:00
Operand.h LibJS: Flatten Operand to 32-bit index in bytecode instruction stream 2025-12-09 21:44:13 -06:00
PropertyAccess.h LibJS: Replace GC::Weak with GC::RawPtr in inline cache entries 2026-03-08 10:27:13 +01:00
PropertyKeyTable.cpp LibJS: Cache fully-formed PropertyKeys in Executable 2025-12-11 14:34:45 -06:00
PropertyKeyTable.h LibJS+LibWeb: Add missing GC marking visits 2026-01-07 12:48:58 +01:00
PutKind.h LibJS: Consolidate Put bytecode instructions and reduce code bloat 2026-03-04 18:53:12 +01:00
RegexTable.cpp LibJS: Don't rerun regexp optimizer every time a regexp literal is used 2025-12-12 11:43:35 -06:00
RegexTable.h LibJS: Don't rerun regexp optimizer every time a regexp literal is used 2025-12-12 11:43:35 -06:00
Register.h LibJS: Replace implicit environment stack with explicit registers 2026-02-09 16:35:39 +01:00
ScopedOperand.cpp LibJS: Flatten Operand to 32-bit index in bytecode instruction stream 2025-12-09 21:44:13 -06:00
ScopedOperand.h LibJS: Revert Enable EXPLICIT_SYMBOL_EXPORT 2025-07-22 11:51:29 -04:00
StringTable.cpp LibJS+LibWeb: Port interned bytecode strings to UTF-16 2025-08-14 10:27:08 +02:00
StringTable.h LibJS+LibWeb: Port interned bytecode strings to UTF-16 2025-08-14 10:27:08 +02:00