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gitea/vendor/github.com/minio/sha256-simd/sha256blockSsse_amd64.s

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//+build !noasm,!appengine
// SHA256 implementation for SSSE3
//
// Minio Cloud Storage, (C) 2016 Minio, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// This code is based on an Intel White-Paper:
// "Fast SHA-256 Implementations on Intel Architecture Processors"
//
// together with the reference implementation from the following authors:
// James Guilford <james.guilford@intel.com>
// Kirk Yap <kirk.s.yap@intel.com>
// Tim Chen <tim.c.chen@linux.intel.com>
//
// For Golang it has been converted to Plan 9 assembly with the help of
// github.com/minio/asm2plan9s to assemble Intel instructions to their Plan9
// equivalents
//
#include "textflag.h"
#define ROTATE_XS \
MOVOU X4, X15 \
MOVOU X5, X4 \
MOVOU X6, X5 \
MOVOU X7, X6 \
MOVOU X15, X7
// compute s0 four at a time and s1 two at a time
// compute W[-16] + W[-7] 4 at a time
#define FOUR_ROUNDS_AND_SCHED(a, b, c, d, e, f, g, h) \
MOVL e, R13 \ // y0 = e
ROLL $18, R13 \ // y0 = e >> (25-11)
MOVL a, R14 \ // y1 = a
MOVOU X7, X0 \
LONG $0x0f3a0f66; WORD $0x04c6 \ // PALIGNR XMM0,XMM6,0x4 /* XTMP0 = W[-7] */
ROLL $23, R14 \ // y1 = a >> (22-13)
XORL e, R13 \ // y0 = e ^ (e >> (25-11))
MOVL f, R15 \ // y2 = f
ROLL $27, R13 \ // y0 = (e >> (11-6)) ^ (e >> (25-6))
XORL a, R14 \ // y1 = a ^ (a >> (22-13)
XORL g, R15 \ // y2 = f^g
LONG $0xc4fe0f66 \ // PADDD XMM0,XMM4 /* XTMP0 = W[-7] + W[-16] */
XORL e, R13 \ // y0 = e ^ (e >> (11-6)) ^ (e >> (25-6) )
ANDL e, R15 \ // y2 = (f^g)&e
ROLL $21, R14 \ // y1 = (a >> (13-2)) ^ (a >> (22-2))
\
\ // compute s0
\
MOVOU X5, X1 \
LONG $0x0f3a0f66; WORD $0x04cc \ // PALIGNR XMM1,XMM4,0x4 /* XTMP1 = W[-15] */
XORL a, R14 \ // y1 = a ^ (a >> (13-2)) ^ (a >> (22-2))
ROLL $26, R13 \ // y0 = S1 = (e>>6) & (e>>11) ^ (e>>25)
XORL g, R15 \ // y2 = CH = ((f^g)&e)^g
ROLL $30, R14 \ // y1 = S0 = (a>>2) ^ (a>>13) ^ (a>>22)
ADDL R13, R15 \ // y2 = S1 + CH
ADDL _xfer+48(FP), R15 \ // y2 = k + w + S1 + CH
MOVL a, R13 \ // y0 = a
ADDL R15, h \ // h = h + S1 + CH + k + w
\ // ROTATE_ARGS
MOVL a, R15 \ // y2 = a
MOVOU X1, X2 \
LONG $0xd2720f66; BYTE $0x07 \ // PSRLD XMM2,0x7 /* */
ORL c, R13 \ // y0 = a|c
ADDL h, d \ // d = d + h + S1 + CH + k + w
ANDL c, R15 \ // y2 = a&c
MOVOU X1, X3 \
LONG $0xf3720f66; BYTE $0x19 \ // PSLLD XMM3,0x19 /* */
ANDL b, R13 \ // y0 = (a|c)&b
ADDL R14, h \ // h = h + S1 + CH + k + w + S0
LONG $0xdaeb0f66 \ // POR XMM3,XMM2 /* XTMP1 = W[-15] MY_ROR 7 */
ORL R15, R13 \ // y0 = MAJ = (a|c)&b)|(a&c)
ADDL R13, h \ // h = h + S1 + CH + k + w + S0 + MAJ
\ // ROTATE_ARGS
MOVL d, R13 \ // y0 = e
MOVL h, R14 \ // y1 = a
ROLL $18, R13 \ // y0 = e >> (25-11)
XORL d, R13 \ // y0 = e ^ (e >> (25-11))
MOVL e, R15 \ // y2 = f
ROLL $23, R14 \ // y1 = a >> (22-13)
MOVOU X1, X2 \
LONG $0xd2720f66; BYTE $0x12 \ // PSRLD XMM2,0x12 /* */
XORL h, R14 \ // y1 = a ^ (a >> (22-13)
ROLL $27, R13 \ // y0 = (e >> (11-6)) ^ (e >> (25-6))
XORL f, R15 \ // y2 = f^g
MOVOU X1, X8 \
LONG $0x720f4166; WORD $0x03d0 \ // PSRLD XMM8,0x3 /* XTMP4 = W[-15] >> 3 */
ROLL $21, R14 \ // y1 = (a >> (13-2)) ^ (a >> (22-2))
XORL d, R13 \ // y0 = e ^ (e >> (11-6)) ^ (e >> (25-6))
ANDL d, R15 \ // y2 = (f^g)&e
ROLL $26, R13 \ // y0 = S1 = (e>>6) & (e>>11) ^ (e>>25)
LONG $0xf1720f66; BYTE $0x0e \ // PSLLD XMM1,0xe /* */
XORL h, R14 \ // y1 = a ^ (a >> (13-2)) ^ (a >> (22-2))
XORL f, R15 \ // y2 = CH = ((f^g)&e)^g
LONG $0xd9ef0f66 \ // PXOR XMM3,XMM1 /* */
ADDL R13, R15 \ // y2 = S1 + CH
ADDL _xfer+52(FP), R15 \ // y2 = k + w + S1 + CH
ROLL $30, R14 \ // y1 = S0 = (a>>2) ^ (a>>13) ^ (a>>22)
LONG $0xdaef0f66 \ // PXOR XMM3,XMM2 /* XTMP1 = W[-15] MY_ROR 7 ^ W[-15] MY_ROR */
MOVL h, R13 \ // y0 = a
ADDL R15, g \ // h = h + S1 + CH + k + w
MOVL h, R15 \ // y2 = a
MOVOU X3, X1 \
LONG $0xef0f4166; BYTE $0xc8 \ // PXOR XMM1,XMM8 /* XTMP1 = s0 */
ORL b, R13 \ // y0 = a|c
ADDL g, c \ // d = d + h + S1 + CH + k + w
ANDL b, R15 \ // y2 = a&c
\
\ // compute low s1
\
LONG $0xd7700f66; BYTE $0xfa \ // PSHUFD XMM2,XMM7,0xfa /* XTMP2 = W[-2] {BBAA} */
ANDL a, R13 \ // y0 = (a|c)&b
ADDL R14, g \ // h = h + S1 + CH + k + w + S0
LONG $0xc1fe0f66 \ // PADDD XMM0,XMM1 /* XTMP0 = W[-16] + W[-7] + s0 */
ORL R15, R13 \ // y0 = MAJ = (a|c)&b)|(a&c)
ADDL R13, g \ // h = h + S1 + CH + k + w + S0 + MAJ
\ // ROTATE_ARGS
MOVL c, R13 \ // y0 = e
MOVL g, R14 \ // y1 = a
ROLL $18, R13 \ // y0 = e >> (25-11)
XORL c, R13 \ // y0 = e ^ (e >> (25-11))
ROLL $23, R14 \ // y1 = a >> (22-13)
MOVL d, R15 \ // y2 = f
XORL g, R14 \ // y1 = a ^ (a >> (22-13)
ROLL $27, R13 \ // y0 = (e >> (11-6)) ^ (e >> (25-6))
MOVOU X2, X8 \
LONG $0x720f4166; WORD $0x0ad0 \ // PSRLD XMM8,0xa /* XTMP4 = W[-2] >> 10 {BBAA} */
XORL e, R15 \ // y2 = f^g
MOVOU X2, X3 \
LONG $0xd3730f66; BYTE $0x13 \ // PSRLQ XMM3,0x13 /* XTMP3 = W[-2] MY_ROR 19 {xBxA} */
XORL c, R13 \ // y0 = e ^ (e >> (11-6)) ^ (e >> (25-6))
ANDL c, R15 \ // y2 = (f^g)&e
LONG $0xd2730f66; BYTE $0x11 \ // PSRLQ XMM2,0x11 /* XTMP2 = W[-2] MY_ROR 17 {xBxA} */
ROLL $21, R14 \ // y1 = (a >> (13-2)) ^ (a >> (22-2))
XORL g, R14 \ // y1 = a ^ (a >> (13-2)) ^ (a >> (22-2))
XORL e, R15 \ // y2 = CH = ((f^g)&e)^g
ROLL $26, R13 \ // y0 = S1 = (e>>6) & (e>>11) ^ (e>>25)
LONG $0xd3ef0f66 \ // PXOR XMM2,XMM3 /* */
ADDL R13, R15 \ // y2 = S1 + CH
ROLL $30, R14 \ // y1 = S0 = (a>>2) ^ (a>>13) ^ (a>>22)
ADDL _xfer+56(FP), R15 \ // y2 = k + w + S1 + CH
LONG $0xef0f4466; BYTE $0xc2 \ // PXOR XMM8,XMM2 /* XTMP4 = s1 {xBxA} */
MOVL g, R13 \ // y0 = a
ADDL R15, f \ // h = h + S1 + CH + k + w
MOVL g, R15 \ // y2 = a
LONG $0x380f4566; WORD $0xc200 \ // PSHUFB XMM8,XMM10 /* XTMP4 = s1 {00BA} */
ORL a, R13 \ // y0 = a|c
ADDL f, b \ // d = d + h + S1 + CH + k + w
ANDL a, R15 \ // y2 = a&c
LONG $0xfe0f4166; BYTE $0xc0 \ // PADDD XMM0,XMM8 /* XTMP0 = {..., ..., W[1], W[0]} */
ANDL h, R13 \ // y0 = (a|c)&b
ADDL R14, f \ // h = h + S1 + CH + k + w + S0
\
\ // compute high s1
\
LONG $0xd0700f66; BYTE $0x50 \ // PSHUFD XMM2,XMM0,0x50 /* XTMP2 = W[-2] {DDCC} */
ORL R15, R13 \ // y0 = MAJ = (a|c)&b)|(a&c)
ADDL R13, f \ // h = h + S1 + CH + k + w + S0 + MAJ
\ // ROTATE_ARGS
MOVL b, R13 \ // y0 = e
ROLL $18, R13 \ // y0 = e >> (25-11)
MOVL f, R14 \ // y1 = a
ROLL $23, R14 \ // y1 = a >> (22-13)
XORL b, R13 \ // y0 = e ^ (e >> (25-11))
MOVL c, R15 \ // y2 = f
ROLL $27, R13 \ // y0 = (e >> (11-6)) ^ (e >> (25-6))
MOVOU X2, X11 \
LONG $0x720f4166; WORD $0x0ad3 \ // PSRLD XMM11,0xa /* XTMP5 = W[-2] >> 10 {DDCC} */
XORL f, R14 \ // y1 = a ^ (a >> (22-13)
XORL d, R15 \ // y2 = f^g
MOVOU X2, X3 \
LONG $0xd3730f66; BYTE $0x13 \ // PSRLQ XMM3,0x13 /* XTMP3 = W[-2] MY_ROR 19 {xDxC} */
XORL b, R13 \ // y0 = e ^ (e >> (11-6)) ^ (e >> (25-6))
ANDL b, R15 \ // y2 = (f^g)&e
ROLL $21, R14 \ // y1 = (a >> (13-2)) ^ (a >> (22-2))
LONG $0xd2730f66; BYTE $0x11 \ // PSRLQ XMM2,0x11 /* XTMP2 = W[-2] MY_ROR 17 {xDxC} */
XORL f, R14 \ // y1 = a ^ (a >> (13-2)) ^ (a >> (22-2))
ROLL $26, R13 \ // y0 = S1 = (e>>6) & (e>>11) ^ (e>>25)
XORL d, R15 \ // y2 = CH = ((f^g)&e)^g
LONG $0xd3ef0f66 \ // PXOR XMM2,XMM3 /* */
ROLL $30, R14 \ // y1 = S0 = (a>>2) ^ (a>>13) ^ (a>>22)
ADDL R13, R15 \ // y2 = S1 + CH
ADDL _xfer+60(FP), R15 \ // y2 = k + w + S1 + CH
LONG $0xef0f4466; BYTE $0xda \ // PXOR XMM11,XMM2 /* XTMP5 = s1 {xDxC} */
MOVL f, R13 \ // y0 = a
ADDL R15, e \ // h = h + S1 + CH + k + w
MOVL f, R15 \ // y2 = a
LONG $0x380f4566; WORD $0xdc00 \ // PSHUFB XMM11,XMM12 /* XTMP5 = s1 {DC00} */
ORL h, R13 \ // y0 = a|c
ADDL e, a \ // d = d + h + S1 + CH + k + w
ANDL h, R15 \ // y2 = a&c
MOVOU X11, X4 \
LONG $0xe0fe0f66 \ // PADDD XMM4,XMM0 /* X0 = {W[3], W[2], W[1], W[0]} */
ANDL g, R13 \ // y0 = (a|c)&b
ADDL R14, e \ // h = h + S1 + CH + k + w + S0
ORL R15, R13 \ // y0 = MAJ = (a|c)&b)|(a&c)
ADDL R13, e \ // h = h + S1 + CH + k + w + S0 + MAJ
\ // ROTATE_ARGS
ROTATE_XS
#define DO_ROUND(a, b, c, d, e, f, g, h, offset) \
MOVL e, R13 \ // y0 = e
ROLL $18, R13 \ // y0 = e >> (25-11)
MOVL a, R14 \ // y1 = a
XORL e, R13 \ // y0 = e ^ (e >> (25-11))
ROLL $23, R14 \ // y1 = a >> (22-13)
MOVL f, R15 \ // y2 = f
XORL a, R14 \ // y1 = a ^ (a >> (22-13)
ROLL $27, R13 \ // y0 = (e >> (11-6)) ^ (e >> (25-6))
XORL g, R15 \ // y2 = f^g
XORL e, R13 \ // y0 = e ^ (e >> (11-6)) ^ (e >> (25-6))
ROLL $21, R14 \ // y1 = (a >> (13-2)) ^ (a >> (22-2))
ANDL e, R15 \ // y2 = (f^g)&e
XORL a, R14 \ // y1 = a ^ (a >> (13-2)) ^ (a >> (22-2))
ROLL $26, R13 \ // y0 = S1 = (e>>6) & (e>>11) ^ (e>>25)
XORL g, R15 \ // y2 = CH = ((f^g)&e)^g
ADDL R13, R15 \ // y2 = S1 + CH
ROLL $30, R14 \ // y1 = S0 = (a>>2) ^ (a>>13) ^ (a>>22)
ADDL _xfer+offset(FP), R15 \ // y2 = k + w + S1 + CH
MOVL a, R13 \ // y0 = a
ADDL R15, h \ // h = h + S1 + CH + k + w
MOVL a, R15 \ // y2 = a
ORL c, R13 \ // y0 = a|c
ADDL h, d \ // d = d + h + S1 + CH + k + w
ANDL c, R15 \ // y2 = a&c
ANDL b, R13 \ // y0 = (a|c)&b
ADDL R14, h \ // h = h + S1 + CH + k + w + S0
ORL R15, R13 \ // y0 = MAJ = (a|c)&b)|(a&c)
ADDL R13, h // h = h + S1 + CH + k + w + S0 + MAJ
// func blockSsse(h []uint32, message []uint8, reserved0, reserved1, reserved2, reserved3 uint64)
TEXT ·blockSsse(SB), 7, $0-80
MOVQ h+0(FP), SI // SI: &h
MOVQ message_base+24(FP), R8 // &message
MOVQ message_len+32(FP), R9 // length of message
CMPQ R9, $0
JEQ done_hash
ADDQ R8, R9
MOVQ R9, reserved2+64(FP) // store end of message
// Register definition
// a --> eax
// b --> ebx
// c --> ecx
// d --> r8d
// e --> edx
// f --> r9d
// g --> r10d
// h --> r11d
//
// y0 --> r13d
// y1 --> r14d
// y2 --> r15d
MOVL (0*4)(SI), AX // a = H0
MOVL (1*4)(SI), BX // b = H1
MOVL (2*4)(SI), CX // c = H2
MOVL (3*4)(SI), R8 // d = H3
MOVL (4*4)(SI), DX // e = H4
MOVL (5*4)(SI), R9 // f = H5
MOVL (6*4)(SI), R10 // g = H6
MOVL (7*4)(SI), R11 // h = H7
MOVOU bflipMask<>(SB), X13
MOVOU shuf00BA<>(SB), X10 // shuffle xBxA -> 00BA
MOVOU shufDC00<>(SB), X12 // shuffle xDxC -> DC00
MOVQ message_base+24(FP), SI // SI: &message
loop0:
LEAQ constants<>(SB), BP
// byte swap first 16 dwords
MOVOU 0*16(SI), X4
LONG $0x380f4166; WORD $0xe500 // PSHUFB XMM4, XMM13
MOVOU 1*16(SI), X5
LONG $0x380f4166; WORD $0xed00 // PSHUFB XMM5, XMM13
MOVOU 2*16(SI), X6
LONG $0x380f4166; WORD $0xf500 // PSHUFB XMM6, XMM13
MOVOU 3*16(SI), X7
LONG $0x380f4166; WORD $0xfd00 // PSHUFB XMM7, XMM13
MOVQ SI, reserved3+72(FP)
MOVD $0x3, DI
// Align
// nop WORD PTR [rax+rax*1+0x0]
// schedule 48 input dwords, by doing 3 rounds of 16 each
loop1:
MOVOU X4, X9
LONG $0xfe0f4466; WORD $0x004d // PADDD XMM9, 0[RBP] /* Add 1st constant to first part of message */
MOVOU X9, reserved0+48(FP)
FOUR_ROUNDS_AND_SCHED(AX, BX, CX, R8, DX, R9, R10, R11)
MOVOU X4, X9
LONG $0xfe0f4466; WORD $0x104d // PADDD XMM9, 16[RBP] /* Add 2nd constant to message */
MOVOU X9, reserved0+48(FP)
FOUR_ROUNDS_AND_SCHED(DX, R9, R10, R11, AX, BX, CX, R8)
MOVOU X4, X9
LONG $0xfe0f4466; WORD $0x204d // PADDD XMM9, 32[RBP] /* Add 3rd constant to message */
MOVOU X9, reserved0+48(FP)
FOUR_ROUNDS_AND_SCHED(AX, BX, CX, R8, DX, R9, R10, R11)
MOVOU X4, X9
LONG $0xfe0f4466; WORD $0x304d // PADDD XMM9, 48[RBP] /* Add 4th constant to message */
MOVOU X9, reserved0+48(FP)
ADDQ $64, BP
FOUR_ROUNDS_AND_SCHED(DX, R9, R10, R11, AX, BX, CX, R8)
SUBQ $1, DI
JNE loop1
MOVD $0x2, DI
loop2:
MOVOU X4, X9
LONG $0xfe0f4466; WORD $0x004d // PADDD XMM9, 0[RBP] /* Add 1st constant to first part of message */
MOVOU X9, reserved0+48(FP)
DO_ROUND( AX, BX, CX, R8, DX, R9, R10, R11, 48)
DO_ROUND(R11, AX, BX, CX, R8, DX, R9, R10, 52)
DO_ROUND(R10, R11, AX, BX, CX, R8, DX, R9, 56)
DO_ROUND( R9, R10, R11, AX, BX, CX, R8, DX, 60)
MOVOU X5, X9
LONG $0xfe0f4466; WORD $0x104d // PADDD XMM9, 16[RBP] /* Add 2nd constant to message */
MOVOU X9, reserved0+48(FP)
ADDQ $32, BP
DO_ROUND( DX, R9, R10, R11, AX, BX, CX, R8, 48)
DO_ROUND( R8, DX, R9, R10, R11, AX, BX, CX, 52)
DO_ROUND( CX, R8, DX, R9, R10, R11, AX, BX, 56)
DO_ROUND( BX, CX, R8, DX, R9, R10, R11, AX, 60)
MOVOU X6, X4
MOVOU X7, X5
SUBQ $1, DI
JNE loop2
MOVQ h+0(FP), SI // SI: &h
ADDL (0*4)(SI), AX // H0 = a + H0
MOVL AX, (0*4)(SI)
ADDL (1*4)(SI), BX // H1 = b + H1
MOVL BX, (1*4)(SI)
ADDL (2*4)(SI), CX // H2 = c + H2
MOVL CX, (2*4)(SI)
ADDL (3*4)(SI), R8 // H3 = d + H3
MOVL R8, (3*4)(SI)
ADDL (4*4)(SI), DX // H4 = e + H4
MOVL DX, (4*4)(SI)
ADDL (5*4)(SI), R9 // H5 = f + H5
MOVL R9, (5*4)(SI)
ADDL (6*4)(SI), R10 // H6 = g + H6
MOVL R10, (6*4)(SI)
ADDL (7*4)(SI), R11 // H7 = h + H7
MOVL R11, (7*4)(SI)
MOVQ reserved3+72(FP), SI
ADDQ $64, SI
CMPQ reserved2+64(FP), SI
JNE loop0
done_hash:
RET
// Constants table
DATA constants<>+0x0(SB)/8, $0x71374491428a2f98
DATA constants<>+0x8(SB)/8, $0xe9b5dba5b5c0fbcf
DATA constants<>+0x10(SB)/8, $0x59f111f13956c25b
DATA constants<>+0x18(SB)/8, $0xab1c5ed5923f82a4
DATA constants<>+0x20(SB)/8, $0x12835b01d807aa98
DATA constants<>+0x28(SB)/8, $0x550c7dc3243185be
DATA constants<>+0x30(SB)/8, $0x80deb1fe72be5d74
DATA constants<>+0x38(SB)/8, $0xc19bf1749bdc06a7
DATA constants<>+0x40(SB)/8, $0xefbe4786e49b69c1
DATA constants<>+0x48(SB)/8, $0x240ca1cc0fc19dc6
DATA constants<>+0x50(SB)/8, $0x4a7484aa2de92c6f
DATA constants<>+0x58(SB)/8, $0x76f988da5cb0a9dc
DATA constants<>+0x60(SB)/8, $0xa831c66d983e5152
DATA constants<>+0x68(SB)/8, $0xbf597fc7b00327c8
DATA constants<>+0x70(SB)/8, $0xd5a79147c6e00bf3
DATA constants<>+0x78(SB)/8, $0x1429296706ca6351
DATA constants<>+0x80(SB)/8, $0x2e1b213827b70a85
DATA constants<>+0x88(SB)/8, $0x53380d134d2c6dfc
DATA constants<>+0x90(SB)/8, $0x766a0abb650a7354
DATA constants<>+0x98(SB)/8, $0x92722c8581c2c92e
DATA constants<>+0xa0(SB)/8, $0xa81a664ba2bfe8a1
DATA constants<>+0xa8(SB)/8, $0xc76c51a3c24b8b70
DATA constants<>+0xb0(SB)/8, $0xd6990624d192e819
DATA constants<>+0xb8(SB)/8, $0x106aa070f40e3585
DATA constants<>+0xc0(SB)/8, $0x1e376c0819a4c116
DATA constants<>+0xc8(SB)/8, $0x34b0bcb52748774c
DATA constants<>+0xd0(SB)/8, $0x4ed8aa4a391c0cb3
DATA constants<>+0xd8(SB)/8, $0x682e6ff35b9cca4f
DATA constants<>+0xe0(SB)/8, $0x78a5636f748f82ee
DATA constants<>+0xe8(SB)/8, $0x8cc7020884c87814
DATA constants<>+0xf0(SB)/8, $0xa4506ceb90befffa
DATA constants<>+0xf8(SB)/8, $0xc67178f2bef9a3f7
DATA bflipMask<>+0x00(SB)/8, $0x0405060700010203
DATA bflipMask<>+0x08(SB)/8, $0x0c0d0e0f08090a0b
DATA shuf00BA<>+0x00(SB)/8, $0x0b0a090803020100
DATA shuf00BA<>+0x08(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA shufDC00<>+0x00(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA shufDC00<>+0x08(SB)/8, $0x0b0a090803020100
GLOBL constants<>(SB), 8, $256
GLOBL bflipMask<>(SB), (NOPTR+RODATA), $16
GLOBL shuf00BA<>(SB), (NOPTR+RODATA), $16
GLOBL shufDC00<>(SB), (NOPTR+RODATA), $16
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