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feat(asm): add the wider EVEX set and the rounding, SAE and broadcast suffixes

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petrbalvin
2026-07-18 15:47:59 +02:00
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7 changed files with 655 additions and 99 deletions
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@@ -228,11 +228,21 @@ explicit merging/zeroing masks — written the way Go writes them, as a K
operand among the operands plus a `.Z` mnemonic suffix), and the compressed
disp8×N displacement, whose multiplier follows the memory operand's size —
covering every instruction the go-flac and go-lz4 AVX2/AVX-512 kernels use,
plus the common AVX-512 F/BW integer set and the floating-point and
conversion set (the packed double arithmetic, the scalar SD/SS forms —
whose EVEX encodings serve masked and zeroing use — `VMOVDDUP`, and the
width-changing conversions, including the `VCVTPD2DQ`/`VCVTTPD2DQ` family
whose length follows the wider source operand). Every encoding is validated two ways: by
plus the common AVX-512 F/BW integer set, the floating-point and conversion
set (the packed double and single arithmetic, the scalar SD/SS forms —
whose EVEX encodings serve masked and zeroing use — `VMOVDDUP`, the
replicating moves, and the width-changing conversions, including the
`VCVTPD2DQ`/`VCVTTPD2DQ` family whose length follows the wider source
operand), and the wider AVX-512 set: ternary logic, lane shuffles, inserts
and extracts, compares with an opmask destination, the permutes, the
expand/compress family, the broadcasts, the opmask-register instructions
(KAND/KOR/KXNOR/KADD/KUNPCK/KNOT/KSHIFTL/KORTEST and KMOVQ), the aligned
moves and the remaining extending/narrowing moves. The EVEX mnemonic
suffixes — rounding modes (.RN_SAE/.RD_SAE/.RU_SAE/.RZ_SAE),
suppress-all-exceptions (.SAE) and memory broadcast (.BCST) — set the EVEX
b bit and the L'L rounding-control field (broadcast keeps the vector length
and scales disp8 by the element size), and combine with the .Z zeroing
suffix. Every encoding is validated two ways: by
round-trip decoding through `golang.org/x/arch`, and byte-for-byte against
the machine code the real Go assembler emits — a comparison that holds for
whole functions: all 27 functions of both kernels assemble to exactly the Go