Performance & Systems
Aug 7, 2026
Full real Intel instruction decoding tree (like Ghidra view)
Full real Intel instruction decoding tree (like Ghidra view) 1. Full x86-64 Instruction Decoding Tree (Ghidra Style)Example instruction:xxxxxxxxxxmov r10, [r8 + r9*4 + 16]Machine code (conceptual layout):xxxxxxxxxxREX OPCODE ModR/M SIB DISP4C 8B 54 88 102. FULL DECODING TREExxxxxxxxxxROOT: RAW INSTRUCTION BYTES│├──…
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Performance & Systems
Aug 7, 2026
Full SIB + ModRM + REX combined diagram
Full SIB + ModR/M + REX combined diagram 1. Full Instruction Layout (x86-64)xxxxxxxxxx+--------+---------+----------+-------+--------+--------+| REX | OPCODE | ModR/M | SIB | DISP | IMM |+--------+---------+----------+-------+--------+--------+Not all fields are always present, but this is the maximum structure.2.…
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Performance & Systems
Aug 7, 2026
Visual diagram of ModRM + REX decoding
Visual diagram of ModR/M + REX decoding 1. Full Instruction Layout (x86-64)A typical instruction looks like this:[ REX ] [ OPCODE ] [ MODR/M ] [ SIB ] [ DISP ] [ IMM ]Not all fields are always present.2. Focus: REX + ModR/M InteractionStep-by-step decoding pipelinexxxxxxxxxx +----------------+ | REX Prefix | |…
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Performance & Systems
Aug 7, 2026
x86-64 Registers — Complete Technical Guide with REX Extension
x86-64 Registers — Complete Technical Guide with REX Extensionx86-64 architecture extends the original x86 CPU register set from 8 to 16 general-purpose registers while maintaining full backward compatibility. This is achieved using a mechanism called the REX prefix, which adds one additional bit to existing 3-bit…
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Performance & Systems
Aug 7, 2026
The Computer's Startup Journey From the Power Button to the Desktop
The Computer's Startup Journey: From the Power Button to the DesktopThe boot process can be compared to building and preparing a complete theater. Initially, there is only silent hardware. Then, the foundation is tested (memory, processor), a simple wooden platform is built (the firmware), the backstage and stage…
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Performance & Systems
Aug 7, 2026
x86-64 CPU Operating Modes (Complete Overview)
x86-64 CPU Operating Modes (Complete Overview)Modern x86-64 processors operate in several distinct modes that determine:Instruction decodingRegister size and availabilityMemory addressing behaviorPrivilege and protection mechanismsThese modes exist primarily for backward compatibility and progressive feature…
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Compilers & Tools
Aug 7, 2026
New C++26 Feature in Clang 22.1.4
New C++26 Feature in Clang 22.1.4 Constexpr Structured Bindings (P2686R5): The headline feature, but it's partially implemented. It currently supports decompositions into arrays and aggregates, but not references to constexpr or the decomposition of tuple-like types.C++26 Core Language Features Available in Clang…
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Compilers & Tools
Aug 7, 2026
GCC 16.1 and C++26 What You Can Actually Use Today
GCC 16.1 and C++26: What You Can Actually Use TodayAs C++26 continues to take shape, many developers are eager to explore its new features—especially when working with modern toolchains like GCC 16.1.But here is the reality professionals need to understand:GCC 16.1 does not “support C++26” in the complete sense. What…
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Performance & Systems
Aug 7, 2026
Beyond stdthread The C++20 Multithreading Revolution
Beyond std::thread: The C++20 Multithreading RevolutionC++20 represents a watershed moment for multithreading in the language. While C++11 gave us a solid foundation with std::thread, mutexes, and condition variables, C++20 has addressed many of the pain points that made concurrent programming error-prone and verbose.…
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