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// Original source:
// http://www.zorinaq.com/papers/md5-amd64.html
// http://www.zorinaq.com/papers/md5-amd64.tar.bz2
//
// Translated from Perl generating GNU assembly into
// #defines generating 6a assembly by the Go Authors.
//go:build !purego
#include "textflag.h"
// MD5 optimized for AMD64.
//
// Author: Marc Bevand <bevand_m (at) epita.fr>
// Licence: I hereby disclaim the copyright on this code and place it
// in the public domain.
TEXT ·block(SB),NOSPLIT,$8-32
MOVQ dig+0(FP), BP
MOVQ p+8(FP), SI
MOVQ p_len+16(FP), DX
SHRQ $6, DX
SHLQ $6, DX
LEAQ (SI)(DX*1), DI
MOVL (0*4)(BP), AX
MOVL (1*4)(BP), BX
MOVL (2*4)(BP), CX
MOVL (3*4)(BP), DX
MOVL $0xffffffff, R11
CMPQ SI, DI
JEQ end
loop:
MOVL AX, R12
MOVL BX, R13
MOVL CX, R14
MOVL DX, R15
MOVL (0*4)(SI), R8
MOVL DX, R9
#define ROUND1(a, b, c, d, index, const, shift) \
XORL c, R9; \
ADDL $const, a; \
ADDL R8, a; \
ANDL b, R9; \
XORL d, R9; \
MOVL (index*4)(SI), R8; \
ADDL R9, a; \
ROLL $shift, a; \
MOVL c, R9; \
ADDL b, a
ROUND1(AX,BX,CX,DX, 1,0xd76aa478, 7);
ROUND1(DX,AX,BX,CX, 2,0xe8c7b756,12);
ROUND1(CX,DX,AX,BX, 3,0x242070db,17);
ROUND1(BX,CX,DX,AX, 4,0xc1bdceee,22);
ROUND1(AX,BX,CX,DX, 5,0xf57c0faf, 7);
ROUND1(DX,AX,BX,CX, 6,0x4787c62a,12);
ROUND1(CX,DX,AX,BX, 7,0xa8304613,17);
ROUND1(BX,CX,DX,AX, 8,0xfd469501,22);
ROUND1(AX,BX,CX,DX, 9,0x698098d8, 7);
ROUND1(DX,AX,BX,CX,10,0x8b44f7af,12);
ROUND1(CX,DX,AX,BX,11,0xffff5bb1,17);
ROUND1(BX,CX,DX,AX,12,0x895cd7be,22);
ROUND1(AX,BX,CX,DX,13,0x6b901122, 7);
ROUND1(DX,AX,BX,CX,14,0xfd987193,12);
ROUND1(CX,DX,AX,BX,15,0xa679438e,17);
ROUND1(BX,CX,DX,AX, 1,0x49b40821,22);
MOVL DX, R9
MOVL DX, R10
// Uses https://github.com/animetosho/md5-optimisation#dependency-shortcut-in-g-function
#define ROUND2(a, b, c, d, index, const, shift) \
XORL R11, R9; \
ADDL $const, a; \
ADDL R8, a; \
ANDL b, R10; \
ANDL c, R9; \
MOVL (index*4)(SI),R8; \
ADDL R9, a; \
ADDL R10, a; \
MOVL c, R9; \
MOVL c, R10; \
ROLL $shift, a; \
ADDL b, a
ROUND2(AX,BX,CX,DX, 6,0xf61e2562, 5);
ROUND2(DX,AX,BX,CX,11,0xc040b340, 9);
ROUND2(CX,DX,AX,BX, 0,0x265e5a51,14);
ROUND2(BX,CX,DX,AX, 5,0xe9b6c7aa,20);
ROUND2(AX,BX,CX,DX,10,0xd62f105d, 5);
ROUND2(DX,AX,BX,CX,15, 0x2441453, 9);
ROUND2(CX,DX,AX,BX, 4,0xd8a1e681,14);
ROUND2(BX,CX,DX,AX, 9,0xe7d3fbc8,20);
ROUND2(AX,BX,CX,DX,14,0x21e1cde6, 5);
ROUND2(DX,AX,BX,CX, 3,0xc33707d6, 9);
ROUND2(CX,DX,AX,BX, 8,0xf4d50d87,14);
ROUND2(BX,CX,DX,AX,13,0x455a14ed,20);
ROUND2(AX,BX,CX,DX, 2,0xa9e3e905, 5);
ROUND2(DX,AX,BX,CX, 7,0xfcefa3f8, 9);
ROUND2(CX,DX,AX,BX,12,0x676f02d9,14);
ROUND2(BX,CX,DX,AX, 5,0x8d2a4c8a,20);
MOVL CX, R9
// Uses https://github.com/animetosho/md5-optimisation#h-function-re-use
#define ROUND3FIRST(a, b, c, d, index, const, shift) \
MOVL d, R9; \
XORL c, R9; \
XORL b, R9; \
ADDL $const, a; \
ADDL R8, a; \
MOVL (index*4)(SI),R8; \
ADDL R9, a; \
ROLL $shift, a; \
ADDL b, a
#define ROUND3(a, b, c, d, index, const, shift) \
XORL a, R9; \
XORL b, R9; \
ADDL $const, a; \
ADDL R8, a; \
MOVL (index*4)(SI),R8; \
ADDL R9, a; \
ROLL $shift, a; \
ADDL b, a
ROUND3FIRST(AX,BX,CX,DX, 8,0xfffa3942, 4);
ROUND3(DX,AX,BX,CX,11,0x8771f681,11);
ROUND3(CX,DX,AX,BX,14,0x6d9d6122,16);
ROUND3(BX,CX,DX,AX, 1,0xfde5380c,23);
ROUND3(AX,BX,CX,DX, 4,0xa4beea44, 4);
ROUND3(DX,AX,BX,CX, 7,0x4bdecfa9,11);
ROUND3(CX,DX,AX,BX,10,0xf6bb4b60,16);
ROUND3(BX,CX,DX,AX,13,0xbebfbc70,23);
ROUND3(AX,BX,CX,DX, 0,0x289b7ec6, 4);
ROUND3(DX,AX,BX,CX, 3,0xeaa127fa,11);
ROUND3(CX,DX,AX,BX, 6,0xd4ef3085,16);
ROUND3(BX,CX,DX,AX, 9, 0x4881d05,23);
ROUND3(AX,BX,CX,DX,12,0xd9d4d039, 4);
ROUND3(DX,AX,BX,CX,15,0xe6db99e5,11);
ROUND3(CX,DX,AX,BX, 2,0x1fa27cf8,16);
ROUND3(BX,CX,DX,AX, 0,0xc4ac5665,23);
MOVL R11, R9
XORL DX, R9
#define ROUND4(a, b, c, d, index, const, shift) \
ADDL $const, a; \
ADDL R8, a; \
ORL b, R9; \
XORL c, R9; \
ADDL R9, a; \
MOVL (index*4)(SI),R8; \
MOVL $0xffffffff, R9; \
ROLL $shift, a; \
XORL c, R9; \
ADDL b, a
ROUND4(AX,BX,CX,DX, 7,0xf4292244, 6);
ROUND4(DX,AX,BX,CX,14,0x432aff97,10);
ROUND4(CX,DX,AX,BX, 5,0xab9423a7,15);
ROUND4(BX,CX,DX,AX,12,0xfc93a039,21);
ROUND4(AX,BX,CX,DX, 3,0x655b59c3, 6);
ROUND4(DX,AX,BX,CX,10,0x8f0ccc92,10);
ROUND4(CX,DX,AX,BX, 1,0xffeff47d,15);
ROUND4(BX,CX,DX,AX, 8,0x85845dd1,21);
ROUND4(AX,BX,CX,DX,15,0x6fa87e4f, 6);
ROUND4(DX,AX,BX,CX, 6,0xfe2ce6e0,10);
ROUND4(CX,DX,AX,BX,13,0xa3014314,15);
ROUND4(BX,CX,DX,AX, 4,0x4e0811a1,21);
ROUND4(AX,BX,CX,DX,11,0xf7537e82, 6);
ROUND4(DX,AX,BX,CX, 2,0xbd3af235,10);
ROUND4(CX,DX,AX,BX, 9,0x2ad7d2bb,15);
ROUND4(BX,CX,DX,AX, 0,0xeb86d391,21);
ADDL R12, AX
ADDL R13, BX
ADDL R14, CX
ADDL R15, DX
ADDQ $64, SI
CMPQ SI, DI
JB loop
end:
MOVL AX, (0*4)(BP)
MOVL BX, (1*4)(BP)
MOVL CX, (2*4)(BP)
MOVL DX, (3*4)(BP)
RET
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