MOV_V (ORR alias: source feeds both Vn and Vm via a new VN_VM_DUP
encoding), MVN_V (NOT alias, plain 2-register), DUP_V (element form
Vd.T,Vn.Ts[i] and general form Vd.T,Wn/Xn), INS (element-to-element and
from-GPR), EXT_V (imm4 byte index). Adds a VEC_INDEX operand type plus
NEON_IDX5/NEON_IDX4/NEON_EXT_IDX encodings: the element-size marker rides
in the entry bits, the lane index drives the bits above it, and the
decoder recovers the element size from imm5's marker.
Element size now rides in op.size (B=1/H=2/S=4/D=8) via op_v_elem_b/h/s/d
so the matcher can disambiguate DUP/INS element forms; the builder
generator maps V_ELEM_* to those constructors. specgen derives the mask
by varying registers and each index field to its max -- the GPR-source
forms vary Vd and Rn independently (Rn 31 = wzr/xzr) so the low bit of
each field toggles. All 19 representative forms byte-exact vs llvm-mc and
decode-clean; 461 tests green. (TBL/TBX register-list forms deferred.)
First encoder-extension family. Adds Operand_Type VEC_SHIFT and Operand_Encoding NEON_SHL_IMM/NEON_SHR_IMM: the element-size marker bit sits in the entry's bits, the encoder packs the amount into the low immh:immb bits (left = shift; right = esize - shift, esize from the vector operand via vec_esize/form.ops[0]), and the decoder recovers esize from immh to compute the amount.
Adds 13 mnemonics (91 forms) via specgen: left SHL/SLI/SQSHLU/SQSHL, right SSHR/USHR/SRSHR/URSHR/SSRA/USRA/SRSRA/URSRA/SRI. specgen derives bits/mask empirically by varying registers AND the shift (canon = operand bits zero; other extreme sets all shift bits), so per-arrangement immh discrimination + the growing shift-field width fall out automatically.
Verified end-to-end: encode matches llvm-mc byte-for-byte AND decode recovers mnemonic + amount (sshr/shl/sli/ushr/srsra across B/H/S/D); arm64 check + 461 tests pass.
First of the encoder-extension phase ([[rexcode-encode-coverage]]); CCMP_IMM imm5@20:16 pattern generalizes here.
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.
