The toolchain writes the source immediate straight into imm[31:12]
(riscv64.s: AUIPC 24287, X10 encodes 7ffff517), and rejects values
beyond the signed 20-bit span; the encoder divided by 4096 instead and
truncated silently, so the high bits of every large AUIPC and LUI were
lost.
Assisted-by: GLM 5.3 Flash
The toolchain's disassembler prints the segment-prefixed disp32
absolute as FS:0, but the bare-name branch read the segment register
alone and dropped the offset, so MOVQ FS:0, DX silently encoded a
register move. The colon-offset form now lowers to the same
segment-absolute operand the 0(FS) spelling takes.
Assisted-by: GLM 5.3 Flash
The renderer spells a conditional move CMOV plus the condition alone
(CMOVLE, CMOVG), the width carried by the operand registers, so
CMOVLE parsed as the size L and the condition E and encoded CMOVE.
A suffix that is itself a condition name now reads as that condition
with the width from the destination register, and the Plan 9
size-prefixed spellings keep their parse.
Assisted-by: GLM 5.3 Flash
The vector memory section stopped at the three hand-written shapes the
GOROOT kernels use: every other spelling the toolchain accepts, the
width variants, the constant-stride and indexed accesses, the segment
families, the fault-only-first loads, the whole-register moves and the
bit-mask pair were names without an encoder. The mnemonic now parses
into its own fields (direction, segment count, addressing mode, width,
fault-only-first and whole-register markers) and one encoder lays the
word down, with the optional V0 mask operand and the toolchain's
operand shapes. VSETVL joins the configuration settings. The
toolchain's whole vector memory section, six hundred and twenty-eight
statements of masked and unmasked forms, is a differential test against
the oracle, word for word.
Assisted-by: GLM 5.3 Flash
The C extension's own spellings were names the table carried and the
encoder refused: CLWSP stopped the corpus audit's riscv64 file first.
Thirty-eight mnemonics now encode directly to their halfword, with the
toolchain's operand spellings and validation: the stack loads and stores
pin their base to SP, the register-based loads, stores and arithmetic
carry prime registers, CLUI refuses zero and SP, CADDI4SPN scales by
four, CADDI16SP by sixteen, and CJ, CBEQZ and CBNEZ resolve their N(PC)
targets against the final layout, taking a two-byte placeholder in the
early passes so the offsets stay honest. CAND with an immediate is the
toolchain's C.ANDI spelling. The toolchain's whole C extension testdata
block is a differential test, halfword for halfword, beside a range test
at the toolchain's own boundaries.
Assisted-by: GLM 5.3 Flash
The Zba address generation, Zbb unary bit operations, Zbc carry-less
multiplication and Zbs single-bit families were names the table carried
and the encoder refused: thirty spellings plus RORI and XNOR fell over.
The register and immediate forms now encode as the toolchain does, the
unary operations carry their fixed rs2 constant, RORI lowers to ROR's
expansion (its reverse shift compressing like ROR's), XNOR XORs and
inverts in place, and ROL/ROLW rotate left through the same temporary
the toolchain uses, taking a register amount only as its own expansion
requires. The toolchain's whole testdata block for these families is
now a differential test: every word must agree byte for byte.
Assisted-by: GLM 5.3 Flash
SLLI $64 assembled with the amount silently masked into the six-bit
field where the toolchain rejects it, and the word forms took 0-63 where
they take 0-31. Both families now validate against their own width and
the check reads the immediate at full width, so a value the source
spelled beyond int32 cannot wrap into the range; the boundary is pinned
in a test.
Assisted-by: GLM 5.3 Flash
WORD and BYTE read their immediate through the truncating helper, so the
int32 wrap turned WORD $0xffffffff into -1 and rejected it, while WORD
$0x100000000 and BYTE $0x100000001 arrived pre-truncated and slipped
past the range check as small values. Both statements now read the
immediate the source wrote and bound it at the toolchain's own limits:
[0, 0xffffffff] for WORD, [0, 0xff] for BYTE, with the bounds pinned in
a test.
Assisted-by: GLM 5.3 Flash
The riscv64 assembler carried fourteen hand-picked CSR names where the
toolchain resolves three hundred and twenty-nine: a CSRR/CSRW family
instruction naming any privileged register beyond the few base ones came
out as unknown CSR. The table now carries the RISC-V privileged
specification's register set exactly as go tool asm spells it, and a
differential test assembles every name through both assemblers and
requires the words to agree byte for byte.
Assisted-by: GLM 5.3 Flash
A line-for-line byte comparison of the whole amd64enc.s corpus against
go tool asm surfaced divergences the pass-only accounting never showed:
PEXTRW's GPR form swapped its fields, PUSHW took an imm32 where the
toolchain bounds the immediate to 16 bits, the double shift wrote the
unmasked register number into the reg field, VCOMISS carried a 0x66
prefix, RORX dropped the destination's R bit, and the variable bit
shifts used the manual's per-width opcodes where the toolchain
consolidates each row on one opcode with the W bit. The VEX forms the
toolchain prefers for plain vector registers (the SSE2/SSSE3/SSE4.1
AVX twins, the compare-with-predicate family, VMOVUPS, VSHUFPS, the
variable shifts) now encode under VEX, with EVEX left to the ZMM,
opmask and index-16+ spellings, and the mnemonics whose rows never
offer the 2-byte prefix force it. Every line is pinned through the new
corpus parity test (793 lines); the whole corpus file now assembles to
the toolchain's bytes at every commented line (10022 of 10022).
Assisted-by: GLM 5.3 Flash
The SSE3 horizontal and add-subtract pairs, the SSSE3 sign and
horizontal integers, the masked moves in both directions, the
reciprocity and test pairs, the AVX imm8 tail (blends, dot products,
inserts, rounds, MPSADBW, the string compares), the four-operand
variable blends with their /is4 mask byte, the scalar three-operand
moves, the MXCSR accessors, the VPERMIL register controls and the
variable word shifts, plus the BMI2 count forms over memory. Every
encoding is pinned byte for byte against go tool asm through every
corpus line the toolchain's own amd64enc.s carries for the families
(852 lines); the /is4 byte carries the mask register number in its high
nibble, the layout the toolchain emits.
Assisted-by: GLM 5.3 Flash
The packed integer and float binaries, the imm8-controlled SSE4.1 forms,
the variable blends with their X0 mask, the high/low half moves, the
sign-mask extractions, the non-temporal stores, the MOVQ bank crossings
and their odd spellings, the MMX shifts and shuffle and the cache-line
mask stores, plus the scalar leaves LEAVE, INVPCID and the RTM controls.
Every encoding is pinned byte for byte against go tool asm through every
corpus line the toolchain's own amd64enc.s carries for the families
(1465 lines). Two corpus-wide gaps fell out of the comparison: the
64-bit MOV immediate uses the zero-extending form across the unsigned
32-bit span, and the MMX-to-GPR MOVQ puts the bank register in reg.
Assisted-by: GLM 5.3 Flash
XSAVE, XSAVEOPT, XSAVEC and XSAVES with their restore twins, plain and
64, each pinned byte for byte against go tool asm through every corpus
line the toolchain's own amd64enc.s carries for the family (24 lines).
The toolchain emits XSAVEOPT without the manual's 0x66 prefix; the bytes
are the oracle, so the family carries none.
Assisted-by: GLM 5.3 Flash
The no-operand flag and system controls, the sign-extension pair, the
string primitives, the multi-byte no-ops, the cache controls, MOVBE, the
compare-exchange doubles, the random source and FS/GS base pairs, the
descriptor-table accesses, the 0F 00/01 register controls and the
LAR/LSL selector reads and far-segment loads, each pinned byte for byte
against go tool asm through every corpus line the toolchain's own
amd64enc.s carries for the families (279 lines).
Assisted-by: GLM 5.3 Flash
The x87 stack controls, the D8/DC arithmetic pair, the conditional moves,
the register compares, FADDDP, the memory loads and the FXSAVE pair, each
pinned byte for byte against go tool asm through every corpus line the
toolchain's own amd64enc.s carries for the family (78 lines).
Assisted-by: GLM 5.3 Flash
petrbalvin