Rewrite the builder generator to cover every opcode -- each operand maps to a
typed param by kind + quantifier, emitted with a running operand index so all
shapes compose:
optional '?' -> Maybe(T)
variadic '*' -> []T
composite Pair* -> []Pair_Id_Id / []Pair_Lit_Id / []Pair_Id_Lit
LiteralString -> string (packed into word operands)
Id/Lit/enum -> Id / i64 / the typed enum (ValueEnum) or bit_set (BitEnum)
A verb that would clash with an Odin keyword, builtin, builtin type name, or a
re-exported ir.type_* constructor gets a trailing '_' (return_, switch_, string_,
size_of_, type_void_, ...). builder.odin gains the Pair_* types + a string packer.
873 inst_<OpName> + 873 Builder methods. Package compiles; suite 10 passed.
Extend tablegen to emit builders_gen.odin -- 723 opcodes get a low-level
inst_<OpName>(buf, ...) constructor and a high-level Builder method, mapping each
grammar operand to a typed param (IdResultType->Type_Ref, IdResult->auto-allocated
Id, IdRef->Id, LiteralInteger->i64, ValueEnum/BitEnum->the typed enum, trailing
IdRef* -> []Id). builder.odin keeps just the hand-written Builder infrastructure.
Skipped (stay hand-writable, like an ISA's can_generate_builder): operands that
aren't simple typed params yet (optional, Pair* composites, LiteralString),
type-declaration opcodes (those are ir.Type), and verbs colliding with Odin
keywords/builtins (return_, switch_, size_of, ...).
Validated: a function body built via i_add / return_ encodes + round-trips
byte-exact (builder_made test) -> 10 passed.
Two layers, the SPIR-V analog of an ISA's mnemonic builders:
- low level: inst_<OpName>(buf, ...) -> Operation, stateless + alloc-free, the
caller owns the operand backing (SPIR-V operands are a slice, so unlike an
ISA's inline [4]Operand they can't be owned by the return value).
- high level: a Builder owning operand storage + a result-<id> allocator;
iadd/load/store/call/variable/ret/ret_value append to the current block and
return the new <id>.
Hand-written here for a representative slice (Id / no-result / variadic / enum
operands) to fix the pattern; tablegen will generate the full per-opcode set.
Validated: a builder-made function body round-trips byte-exact.
