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feat(asm): add EVEX masking, zeroing and the AVX-512 F/BW integer set

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petrbalvin
2026-07-14 21:03:26 +02:00
parent 9370f9c3ee
commit 0f3146ff2c
9 changed files with 360 additions and 45 deletions
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@@ -142,7 +142,7 @@ Two deeper analyses sit on top of the AST:
has no System V style callee-saved registers (amd64 `BX`, `R12`–`R15` and
the like are caller-saved or permanent scratch, and hand-written kernels may
clobber them freely). The audited set is the frame pointer and the
goroutine pointer per architecture (amd64 `BP`/`R14`, arm64 `R18`/`R28`/
the frame pointer, the goroutine pointer per architecture (amd64 `BP`/`R14`, arm64 `R18`/`R28`/
`R29`, riscv64 `X27`, loong64 `R22`); the goroutine pointer is reported only
when the function can reach the runtime — it is not `NOSPLIT` or makes a
call — since the ABI0 transition machinery restores it on those paths, and
@@ -218,10 +218,13 @@ memory destination r/m), the direction-sensitive moves (`VMOVDQU`, `VMOVUPD`,
`VFMADD231PD`) and the no-operand `VZEROUPPER` — together with `VPERMD` and
the scalar families (`CMOVcc`, `SETcc`, `LZCNT`/`TZCNT`, the extending moves,
`CVTSx2SD`, `IMUL3`) and the EVEX (AVX-512) prefix — the four-byte prefix with
5-bit register fields (Z0–Z31, X/Y 16–31), opmask registers as operands and
mask destinations, and the compressed disp8×N displacement, whose multiplier
follows the memory operand's size — covering every instruction the go-flac
AVX2 and AVX-512 kernels use. Every encoding is validated two ways: by
5-bit register fields (Z0–Z31, X/Y 16–31, with the mod=11 quirk that carries
rm[4] in X̄), opmask registers (K0–K7 as operands, mask destinations and
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. 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