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Interleave carry registers for successive bits

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8 instructions less per byte.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgenii Stratonikov 2021-12-30 11:29:59 +03:00 committed by Alex Vanin
parent 921f8b0579
commit 8dd24d0195
1 changed files with 14 additions and 15 deletions
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29
tz/avx2_amd64.s
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@ -5,19 +5,18 @@
VPAND Y12, tmp, to \ // to2 = 0x000<bit>000<bit>...
VPSUBW to, Y13, to // to2 = 0xFFFF.. or 0x0000 depending on bit
#define mulBit(bit) \
VPSLLQ $1, Y0, Y1 \
VPALIGNR $8, Y1, Y0, Y2 \
#define mulBit(bit, in_1, in_2, out_1, out_2) \
VPSLLQ $1, in_1, Y1 \
VPALIGNR $8, Y1, in_1, Y2 \
VPSRLQ $63, Y2, Y2 \
VPXOR Y1, Y2, Y2 \
VPAND Y1, Y14, Y3 \
VPUNPCKHQDQ Y3, Y3, Y3 \
VPXOR Y2, Y3, Y3 \
mask(bit, Y11, Y2) \
VPXOR Y3, Y8, Y3 \
VPAND Y3, Y2, Y4 \
VPXOR Y4, Y0, Y8 \
VMOVDQU Y3, Y0
VPXOR Y3, in_2, out_1 \
VPAND out_1, Y2, Y4 \
VPXOR Y4, in_1, out_2 \
// func mulByteRightx2(c00c10, c01c11 *[4]uint64, b byte)
TEXT ·mulByteRightx2(SB),NOSPLIT,$0
@ -35,14 +34,14 @@ TEXT ·mulByteRightx2(SB),NOSPLIT,$0
VPBROADCASTB b+16(FP), X10 // X10 = packed bytes of b.
VPMOVZXBW X10, Y10 // Extend with zeroes to packed words.
mulBit($7)
mulBit($6)
mulBit($5)
mulBit($4)
mulBit($3)
mulBit($2)
mulBit($1)
mulBit($0)
mulBit($7, Y0, Y8, Y5, Y6)
mulBit($6, Y5, Y6, Y0, Y8)
mulBit($5, Y0, Y8, Y5, Y6)
mulBit($4, Y5, Y6, Y0, Y8)
mulBit($3, Y0, Y8, Y5, Y6)
mulBit($2, Y5, Y6, Y0, Y8)
mulBit($1, Y0, Y8, Y5, Y6)
mulBit($0, Y5, Y6, Y0, Y8)
VMOVDQU Y8, (BX)
VMOVDQU Y0, (AX)