[DiscoManOfficial]

Summary

Improve checked GSU code generation and add an interactive SNES gem-chess scene with current-source rendering regressions.

Changes

• Add bounded local-storage planning and immutable RAM data pools, improve register allocation and loop-state reuse, and expose --require-no-spills for source compilation and allocation checks.
• Refine branch lowering, checked pointer arithmetic, delay-slot scheduling and CACHE handling while retaining conservative fallbacks and placement checks.
• Reset stack-check credit at control-flow entries and joins so an unexecuted predecessor or earlier loop iteration cannot justify omitting a required check.
• Add a complete board and 32 faceted pieces, orbit/elevation/zoom controls, shaded and wireframe views, a double-buffered SNES host, build support and documentation.
• Extend backend, storage, linker and CLI regressions; exercise the actual scene's raster, private-edge and paint kernels at O2 and Os through the shared native/direct test registry.

Validation

• Release and Debug: 387/387 tests passed in each build, with no failures, skips or incomplete tests; the full prebuilt/direct suite also passed.
• Strict C++14 syntax checks passed for 14 changed production translation units and two runners. Both builds passed 540 boundary self-checks and six gem-chess corpora: 432 public-edge, 568 private-edge and 536 polygon cases at each of O2 and Os, with byte-exact assembly paths.
• Current scene payloads are 27,675 bytes at O2 and 27,260 bytes at Os. Project, direct, compiler-assembly and final-export paths matched byte-for-byte; 12 strict no-spill rejection/output-protection cases passed.
• O2 Mesen positive/negative checks passed within the original 120-second CLI and external limits. Ten baseline BMPs, all 24,576 framebuffer bytes and primitive counts matched exactly; controller, ABI, VRAM/PPU and VBlank checks passed.
• Emulator profile: Mesen 2.2.1+20ba206, NTSC, 21.477 MHz GSU at 100%, CLSR=1, normal multiply timing.

Limitations

• The example is a scene/camera viewer, not a chess rules engine or a real-time game.
• Full-scene Os emulator runtime and physical hardware were not tested; no fresh CI or sanitizer result is claimed. Existing previews and historical timing comparisons are not current performance measurements.
• The scene still fails the optional spill-free constraint. Its diagnostic identifies the first offending function, not a whole-scene spill count; reduced stack traffic does not imply a stackless scene.