nx_dxbc_exec.nx

nx_dxbc_exec.nx -- D2 of the D3D-game ladder: DECODE OPERANDS + EXECUTE a real DXBC shader. A minimal SM5 interpreter over 4-component float32 registers (input v[], output o[], temp r[]) using REAL hardware float32 (nx_f32_hw mulss/addss = the same IEEE-754 ops D3D uses -> bit-matching semantics). Operand token layout decoded from Microsoft fxc's actual output (confirmed): [0:1]=ncomp [2:3]=selmode [4:11]=swizzle/mask [12:19]=optype (0=temp 1=input 2=output 4=immediate32) [20:21]=index-dim. Subset: mov + mad (enough to execute + GRADE a real fxc arithmetic shader vs its known output). Extended operand tokens + full opcode coverage = D2b. license_tier: ORIGINAL