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  • v0.5.0 458cfb626e
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    v0.5.0 Stable

    petrbalvin released this 2026-07-10 11:20:49 +00:00 | 275 commits to main since this release

    EVEX / AVX-512: the go-flac AVX-512 kernel now assembles, byte-identically to
    the Go toolchain, completing the production-kernel coverage.

    Added

    • asm: EVEX (AVX-512) encoding — the four-byte EVEX prefix with the
      5-bit register fields (Z0–Z31, X/Y 16–31, with the reg-r/m X̄ quirk and
      V'̄ shared between vvvv and the SIB index), opmask registers (K0–K7) as
      operands and as mask destinations, and the compressed disp8×N displacement
      (the multiplier follows the memory operand's size, as the Go assembler's
      opcode tables prescribe). Covers every AVX-512 instruction the go-flac
      kernels use: VPXORD/Q, VPADDD, VPSUBD/Q, VPUNPCK*DQ, VPMULLD/Q, VPERMD,
      VPSLLD/VPSRAD/VPSRAQ, VALIGND, VPCMPEQD (K destination), VMOVDQU32,
      VMOVUPD, VCVTQQ2PD, VPMOVSXDQ, the narrowing stores VPMOVDW/VPMOVQD, the
      extracts VEXTRACTI64X4/VEXTRACTF64X4, VFMADD231PD, VADDPD, VMULPD, the
      broadcasts VPBROADCASTD/Q (GPR and memory sources take different opcodes)
      and the mask moves KMOVW/KTESTW. Masking/zeroing suffixes are out of scope
      — the kernels use neither.
    • asm: AssembleFile now accepts file-defined global (non-<>) symbols
      too; a reference is external only when no GLOBL in the file defines it.

    Fixed

    • asm: registers X16–Y31 force the EVEX encoding of dual-form mnemonics;
      previously a VPBROADCASTD AX, Y30 fell into the VEX encoder, which cannot
      represent indices above 15 and silently truncated them.
    • asm: the VEX encoder now rejects vector register indices 16–31 instead of
      encoding a truncated (wrong) register.

    Verified

    • All 10 functions of the go-flac avx512_amd64.s kernel assemble
      byte-identically to the Go toolchain's machine code (the disp32 of the one
      VMOVDQU32 idx16(SB), Z13 load is linker-filled in Go and resolved within
      gasm's own image — checked to reach the right constant bytes). The AVX2
      kernel's 17 functions remain byte-identical.
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