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nmzik
7a7b39e9b9
Trace the invalid SPIR-V emitted for the real 0x6c326400 and 0x090291ef00 compute shaders back to natural-loop construction. A guest conditional could serve as both an OpLoopMerge and OpSelectionMerge header, while multiple native latches could produce more than one SPIR-V backedge for a loop. Canonicalize those RDNA2 control-flow shapes before merge splitting: - join multiple latches through one empty continue block - put an internal guest-header selection behind an empty loop header - rebuild CFG analyses after each bounded rewrite This follows shadPS4's dedicated loop header/continue architecture without introducing a dispatcher or compatibility fallback. Add focused CFG and SPIR-V validation tests for both real failure shapes. Validation: - shader_cfg_tests --loop-canonicalization-only - shader_cfg_tests --loop-break-merge-only - shader_recompiler_compute_tests - spirv-val Vulkan 1.1 for regenerated 0x6c326400 and 0x090291ef00 - launch.json runtime advanced continuously to frame 846 without fatal, crash, or Vulkan validation error The no-argument CFG suite still exposes the independently reproducible, loop-free cube descriptor identity failure in the concurrent dirty tree.