tzhash/tz/avx_amd64.s

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ArmAsm
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#include "textflag.h"
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// mul2 multiplicates FROM by 2, stores result in R1
// and uses R1, R2 and R3 for internal computations.
#define mul2(FROM, TO, R2, R3) \
VPSLLQ $1, FROM, TO \
VPALIGNR $8, TO, FROM, R2 \
PSRLQ $63, R2 \
MOVUPD ·x127x63(SB), R3 \
ANDPD TO, R3 \
VPUNPCKHQDQ R3, R3, R3 \
XORPD R2, TO \
XORPD R3, TO
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// func mulBitRight(c00, c01, c10, c11, e *[2]uint64)
TEXT ·mulBitRight(SB),NOSPLIT,$0
MOVQ c00+0(FP), AX
MOVUPD (AX), X0
MOVUPD X0, X8 // remember c00 value
MOVQ c01+8(FP), BX
MOVUPD (BX), X1
MOVQ c10+16(FP), CX
MOVUPD (CX), X2
MOVUPD X2, X9 // remember c10 value
MOVQ c11+24(FP), DX
MOVUPD (DX), X3
// c00 *= 2
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mul2(X0, X5, X6, X7)
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MOVUPD X5, X0
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// c00 += c01
XORPD X1, X0
MOVUPD X0, (AX)
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// c10 *= 2
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mul2(X2, X5, X6, X7)
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MOVUPD X5, X2
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// c10 += c11
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XORPD X3, X2
MOVUPD X2, (CX)
MOVQ e+32(FP), AX
MOVUPD (AX), X5
// c01 = c00 + e
VANDPD X0, X5, X1
// c01 += X8 (old c00)
XORPD X8, X1
MOVUPD X1, (BX)
// c11 = c10 + e
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VANDPD X2, X5, X3
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// c11 += X9 (old c10)
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XORPD X9, X3
MOVUPD X3, (DX)
RET
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// func mulBitRightx2(c00c10, c01c11 *[4]uint64, e *[2]uint64)
TEXT ·mulBitRightx2(SB),NOSPLIT,$0
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MOVQ c00c10+0(FP), AX
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VMOVDQA (AX), Y0
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MOVQ c01c11+8(FP), BX
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VMOVDQA (BX), Y8
VPSLLQ $1, Y0, Y1
VPALIGNR $8, Y1, Y0, Y2
VPSRLQ $63, Y2, Y2
VPXOR Y1, Y2, Y2
VPSRLQ $63, Y1, Y3
VPSLLQ $63, Y3, Y3
VPUNPCKHQDQ Y3, Y3, Y3
VPXOR Y2, Y3, Y3
MOVQ e+16(FP), CX
VBROADCASTI128 (CX), Y2
VPXOR Y3, Y8, Y3
VPAND Y3, Y2, Y4
VPXOR Y4, Y0, Y8
VMOVDQA Y8, (BX)
VMOVDQA Y3, (AX)
RET