Merge gingerBill's latest into bill/rexcode. His changes: minimize the
Instruction/Operand structs across ISAs with packed raw-unions (+ the
compiler support for #raw_union #packed), the new core:rexcode/wasm arch
and wasm/module, encode() now returns (byte_count, ok) instead of a Result
struct, decode_one made public, and assorted formatting/inlining.
Conflict: arm64/tests/pipeline_smoke.odin CSEL test -- kept the generated
4-arg inst_csel(dst,src,src2,cond) (mnemonic_builders.odin is generated,
not from Bill's branch) and adopted Bill's (byte_count, success) encode
signature.
Required rebuilding ./odin from the merged source for the packed-union
syntax. Re-validated after the repack: regenerated all artifacts
(idempotent -- no spurious churn), all 10 arches gen/builders/check/test
green, and byte-compared the new arm32 BF + mips PS/MMI/DSP/R6 forms to
confirm no field truncation. arm64/arm32/mips still 100%.
Every mnemonic with an encode form now has a generated inst_<mnem>/emit_<mnem> overload group. The per-arch generators map ALL operand types — nothing is skipped: arm64 gains shifted/extended registers (multi-param via op_shifted/op_extended), SVE Z-regs + predicates, SME tile/slice, NEON arrangements/lanes, bitmask/sysreg/pattern immediates and condition codes (427 -> 777 mnemonics); arm32 gains shifted/register-shifted regs, register lists, NEON lanes and all encoded-immediate subclasses (479 -> 592); x86 gains m80 and descriptor-table memory operands — FBLD/FBSTP, LGDT/SGDT/LIDT/SIDT, FLD/FSTP, far-indirect JMP/CALL, BOUND (1167 -> 1175).
Mnemonic-specific builders are now fully generated, not hand-written: deleted the hand-written helpers the generated groups collided with — riscv inst_jal/inst_jalr, arm64 inst_b_cond/inst_cbz/inst_tbz/inst_csel, mos6502 inst_tst — and let the generators own those names (arm64 also gains inst_cbnz/tbnz/csinc/csinv/csneg). Updated the affected test call-sites. The generic operand-shape helpers (inst_r_r, inst_r_r_i, inst_ldst, ...) remain as delegation targets.
Decode-only mnemonics with no encode form are correctly left without builders. ppc/ppc_vle/rsp/mos65816 were already complete.
All 10 ISAs: structure + compile + tests pass; generators idempotent.
Each ISA's hand-written ENCODING_TABLE (the single source of truth) now lives
in a per-arch tablegen/ metaprogram that flattens it and serializes committed
binary blobs; the library #loads those into @(rodata) at compile time rather
than compiling a table body. No arch keeps encoding_table.odin or
decoding_tables.odin -- only a generated tables.odin loader and tables/*.bin.
* Two-stage, type-checked pipeline: tablegen Stage A emits human-readable
generated Odin, which compiles and serializes the blobs in Stage B.
* encode() goes through encoding_forms(m); decoders are unchanged apart from
x86's flattened 2-D index. Decode tables are byte-identical to the old ones.
* build.lua: a LuaJIT driver for the metaprograms, validations, and tests,
with cross-platform gating and a clear report.
* Docs refreshed; the obsolete forward-looking plan in cross_arch_design.md
trimmed to what was actually built.
* Attribution headers added to all rexcode source files; the generators emit
them so generated files keep them.
