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737db89ad0
The second half of encode(): the <id> side tables (Module.type_ids /
global_ids / function_ids -- SPIR-V's flat id space, which ir.Type/Global/
Function don't carry) plus the lowering:
emit_types ir.Type -> OpTypeXxx (void/int/float/vector/pointer/struct/
function; INT signedness + POINTER storage class ride in aux)
emit_constants OpConstant / OpConstantComposite / true/false/null
emit_globals OpVariable (storage class from the pointer type)
emit_operation generic table-driven op emit: INSTRUCTION_INDEX gives the
result-type/result-id prefix, the rest stream from op.operands
emit_functions OpFunction / OpLabel / body / OpFunctionEnd
Validated: a complete void compute main module encodes to byte-exact-correct
SPIR-V (29 words, all checked). Known gaps: OpFunctionParameter, ARRAY/bool
types, explicit enum-parameter operands, computed bound. Decoder next.