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 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
petrbalvin