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