Numerous build and optimisation changes to speedup runtime performance

[doraemoncito]

This change set implements significant build system and performance improvements for the z80cpp Z80 emulator core. The primary goal is to optimise runtime performance while modernising the build infrastructure.

Changes:

• Refactored from virtual dispatch to CRTP (Curiously Recurring Template Pattern) for zero-overhead polymorphism
• Introduced performance optimisation macros (Z80_FORCE_INLINE, Z80_LIKELY, Z80_RESTRICT)
• Modernised CMake build system with LTO, ccache support, and parallel builds
• Added code quality tooling (clang-format, clang-tidy, GitHub Actions CI)
• Renamed header files from .hpp to .h for C++ consistency
• Updated benchmark tests with higher performance expectations

[Copilot]

Pull request overview

This pull request implements significant build system and performance improvements for the z80cpp Z80 emulator core. The primary goal is to optimize runtime performance while modernizing the build infrastructure.

Changes:

• Refactored from virtual dispatch to CRTP (Curiously Recurring Template Pattern) for zero-overhead polymorphism
• Introduced performance optimization macros (Z80_FORCE_INLINE, Z80_LIKELY, Z80_RESTRICT)
• Modernized CMake build system with LTO, ccache support, and parallel builds
• Added code quality tooling (clang-format, clang-tidy, GitHub Actions CI)
• Renamed header files from .hpp to .h for C++ consistency
• Updated benchmark tests with higher performance expectations

Reviewed changes

Copilot reviewed 16 out of 19 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/z80_sim_test.h	New header with updated class interface using CRTP pattern
tests/z80_sim_test.cpp	Refactored to use CRTP bus interface, fixed timing issue, removed Unicode symbols
tests/z80_game_test.cpp	Simplified using C++17 filesystem, updated performance thresholds
tests/z80_benchmark_test.cpp	Updated performance expectations to match optimized build
tests/benchmark_shared.hpp	Converted to shim forwarding to .h file
tests/benchmark_shared.h	New implementation using CRTP pattern
include/z80_types.h	New header defining performance macros and RegisterPair type
include/z80_bus_interface.h	New CRTP-based bus interface replacing virtual dispatch
include/z80operations.h	Removed (replaced by z80_bus_interface.h)
CMakeLists.txt	Complete modernization with optimizations and tooling support
.clang-format	Added code formatting configuration
.clang-tidy	Added static analysis configuration
.github/workflows/code-quality.yml	Added CI workflow for code quality checks
README.md	Extensive documentation updates with build instructions and performance data

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 19 changed files in this pull request and generated 6 comments.

Comments suppressed due to low confidence (1)

tests/z80_benchmark_test.cpp:1

• Performance thresholds increased dramatically from 0.1 MIPS to 80-100 MIPS without verification that the optimizations actually achieve this. These high thresholds may cause tests to fail if the claimed 80% speedup isn't realized in all environments. Consider using more conservative thresholds initially or making them configurable.

// Z80 Performance Benchmark Test Suite

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[Copilot]

Pull request overview

Copilot reviewed 16 out of 19 changed files in this pull request and generated 4 comments.

Comments suppressed due to low confidence (1)

tests/z80_benchmark_test.cpp:1

• The performance thresholds have been dramatically increased from 0.1 MIPS to 80-100 MIPS. While these reflect optimized build expectations, they may cause test failures on slower systems or debug builds. Consider adding conditional thresholds based on CMAKE_BUILD_TYPE or documenting that these tests are only meaningful for Release builds.

// Z80 Performance Benchmark Test Suite

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