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pluck.c
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pluck.c
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/*
* Copyright 2009 Colin Percival, 2011 ArtForz, 2011-2014 pooler, 2015 Jordan Earls
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "cpuminer-config.h"
#include "miner.h"
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <emmintrin.h>
//windows hack bleh
#ifndef htobe32
#define htobe32(x) ((u_int32_t)htonl((u_int32_t)(x)))
#endif
//#define USE_SSE2 1
#define ROTL(a, b) (((a) << (b)) | ((a) >> (32 - (b))))
//note, this is 64 bytes
static inline void xor_salsa8(uint32_t B[16], const uint32_t Bx[16])
{
uint32_t x00,x01,x02,x03,x04,x05,x06,x07,x08,x09,x10,x11,x12,x13,x14,x15;
int i;
x00 = (B[ 0] ^= Bx[ 0]);
x01 = (B[ 1] ^= Bx[ 1]);
x02 = (B[ 2] ^= Bx[ 2]);
x03 = (B[ 3] ^= Bx[ 3]);
x04 = (B[ 4] ^= Bx[ 4]);
x05 = (B[ 5] ^= Bx[ 5]);
x06 = (B[ 6] ^= Bx[ 6]);
x07 = (B[ 7] ^= Bx[ 7]);
x08 = (B[ 8] ^= Bx[ 8]);
x09 = (B[ 9] ^= Bx[ 9]);
x10 = (B[10] ^= Bx[10]);
x11 = (B[11] ^= Bx[11]);
x12 = (B[12] ^= Bx[12]);
x13 = (B[13] ^= Bx[13]);
x14 = (B[14] ^= Bx[14]);
x15 = (B[15] ^= Bx[15]);
for (i = 0; i < 8; i += 2) {
/* Operate on columns. */
x04 ^= ROTL(x00 + x12, 7); x09 ^= ROTL(x05 + x01, 7);
x14 ^= ROTL(x10 + x06, 7); x03 ^= ROTL(x15 + x11, 7);
x08 ^= ROTL(x04 + x00, 9); x13 ^= ROTL(x09 + x05, 9);
x02 ^= ROTL(x14 + x10, 9); x07 ^= ROTL(x03 + x15, 9);
x12 ^= ROTL(x08 + x04, 13); x01 ^= ROTL(x13 + x09, 13);
x06 ^= ROTL(x02 + x14, 13); x11 ^= ROTL(x07 + x03, 13);
x00 ^= ROTL(x12 + x08, 18); x05 ^= ROTL(x01 + x13, 18);
x10 ^= ROTL(x06 + x02, 18); x15 ^= ROTL(x11 + x07, 18);
/* Operate on rows. */
x01 ^= ROTL(x00 + x03, 7); x06 ^= ROTL(x05 + x04, 7);
x11 ^= ROTL(x10 + x09, 7); x12 ^= ROTL(x15 + x14, 7);
x02 ^= ROTL(x01 + x00, 9); x07 ^= ROTL(x06 + x05, 9);
x08 ^= ROTL(x11 + x10, 9); x13 ^= ROTL(x12 + x15, 9);
x03 ^= ROTL(x02 + x01, 13); x04 ^= ROTL(x07 + x06, 13);
x09 ^= ROTL(x08 + x11, 13); x14 ^= ROTL(x13 + x12, 13);
x00 ^= ROTL(x03 + x02, 18); x05 ^= ROTL(x04 + x07, 18);
x10 ^= ROTL(x09 + x08, 18); x15 ^= ROTL(x14 + x13, 18);
}
B[ 0] += x00;
B[ 1] += x01;
B[ 2] += x02;
B[ 3] += x03;
B[ 4] += x04;
B[ 5] += x05;
B[ 6] += x06;
B[ 7] += x07;
B[ 8] += x08;
B[ 9] += x09;
B[10] += x10;
B[11] += x11;
B[12] += x12;
B[13] += x13;
B[14] += x14;
B[15] += x15;
}
#ifdef USE_SSE2
static inline void xor_salsa8_sse2(__m128i B[4], const __m128i Bx[4])
{
__m128i X0, X1, X2, X3;
__m128i T;
int i;
X0 = B[0] = _mm_xor_si128(B[0], Bx[0]);
X1 = B[1] = _mm_xor_si128(B[1], Bx[1]);
X2 = B[2] = _mm_xor_si128(B[2], Bx[2]);
X3 = B[3] = _mm_xor_si128(B[3], Bx[3]);
for (i = 0; i < 8; i += 2) {
/* Operate on "columns". */
T = _mm_add_epi32(X0, X3);
X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 7));
X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 25));
T = _mm_add_epi32(X1, X0);
X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
T = _mm_add_epi32(X2, X1);
X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 13));
X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 19));
T = _mm_add_epi32(X3, X2);
X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
/* Rearrange data. */
X1 = _mm_shuffle_epi32(X1, 0x93);
X2 = _mm_shuffle_epi32(X2, 0x4E);
X3 = _mm_shuffle_epi32(X3, 0x39);
/* Operate on "rows". */
T = _mm_add_epi32(X0, X1);
X3 = _mm_xor_si128(X3, _mm_slli_epi32(T, 7));
X3 = _mm_xor_si128(X3, _mm_srli_epi32(T, 25));
T = _mm_add_epi32(X3, X0);
X2 = _mm_xor_si128(X2, _mm_slli_epi32(T, 9));
X2 = _mm_xor_si128(X2, _mm_srli_epi32(T, 23));
T = _mm_add_epi32(X2, X3);
X1 = _mm_xor_si128(X1, _mm_slli_epi32(T, 13));
X1 = _mm_xor_si128(X1, _mm_srli_epi32(T, 19));
T = _mm_add_epi32(X1, X2);
X0 = _mm_xor_si128(X0, _mm_slli_epi32(T, 18));
X0 = _mm_xor_si128(X0, _mm_srli_epi32(T, 14));
/* Rearrange data. */
X1 = _mm_shuffle_epi32(X1, 0x39);
X2 = _mm_shuffle_epi32(X2, 0x4E);
X3 = _mm_shuffle_epi32(X3, 0x93);
}
B[0] = _mm_add_epi32(B[0], X0);
B[1] = _mm_add_epi32(B[1], X1);
B[2] = _mm_add_epi32(B[2], X2);
B[3] = _mm_add_epi32(B[3], X3);
}
#endif
static inline void assert(int cond)
{
if(!cond)
{
printf("error\n");
exit(1);
}
}
//computes a single sha256 hash
void sha256_hash(unsigned char *hash, const unsigned char *data, int len)
{
uint32_t S[16] __attribute__((aligned(32))), T[64] __attribute__((aligned(32)));
int i, r;
sha256_init(S);
for (r = len; r > -9; r -= 64) {
if (r < 64)
memset(T, 0, 64);
memcpy(T, data + len - r, r > 64 ? 64 : (r < 0 ? 0 : r));
if (r >= 0 && r < 64)
((unsigned char *)T)[r] = 0x80;
for (i = 0; i < 16; i++)
T[i] = be32dec(T + i);
if (r < 56)
T[15] = 8 * len;
sha256_transform_volatile(S, T);
}
for (i = 0; i < 8; i++)
be32enc((uint32_t *)hash + i, S[i]);
}
//hash exactly 64 bytes (ie, sha256 block size)
void sha256_hash512(unsigned char *hash, const unsigned char *data)
{
uint32_t S[16] __attribute__((aligned(32))), T[64] __attribute__((aligned(32)));
int i, r;
sha256_init(S);
memcpy(T, data, 64);
for (i = 0; i < 16; i++)
T[i] = be32dec(T + i);
sha256_transform_volatile(S, T);
memset(T, 0, 64);
//memcpy(T, data + 64, 0);
((unsigned char *)T)[0] = 0x80;
for (i = 0; i < 16; i++)
T[i] = be32dec(T + i);
T[15] = 8 * 64;
sha256_transform_volatile(S, T);
for (i = 0; i < 8; i++)
be32enc((uint32_t *)hash + i, S[i]);
}
void PluckHash(uint32_t *hash, const uint32_t *data, void *hashbuffer, const int N)
{
int size = N * 1024;
memset(hashbuffer, 0, 64);
sha256_hash(hashbuffer, data, BLOCK_HEADER_SIZE);
for(int i = 64; i < size - 32; i += 32)
{
//i-4 because we use integers for all references against this, and we don't want to go 3 bytes over the defined area
//we could use size here, but then it's probable to use 0 as the value in most cases
int randmax = i - 4;
uint32_t joint[16], randbuffer[16], randseed[16];
//setup randbuffer to be an array of random indexes
memcpy(randseed, hashbuffer + i - 64, 64);
if(i > 128) memcpy(randbuffer, hashbuffer + i - 128, 64);
else memset(randbuffer, 0, 64);
xor_salsa8(randbuffer, randseed);
memcpy(joint, hashbuffer + i - 32, 32);
//use the last hash value as the seed
for (int j = 32; j < 64; j += 4)
{
//every other time, change to next random index
//randmax - 32 as otherwise we go beyond memory that's already been written to
uint32_t rand = randbuffer[(j - 32) >> 2] % (randmax - 32);
joint[j >> 2] = *((uint32_t *)(hashbuffer + rand));
}
sha256_hash512(&hashbuffer[i], joint);
//setup randbuffer to be an array of random indexes
//use last hash value and previous hash value(post-mixing)
memcpy(randseed, hashbuffer + i - 32, 64);
if(i > 128) memcpy(randbuffer, hashbuffer + i - 128, 64);
else memset(randbuffer, 0, 64);
xor_salsa8(randbuffer, randseed);
//use the last hash value as the seed
for (int j = 0; j < 32; j += 2)
{
uint32_t rand = randbuffer[j >> 1] % randmax;
*((uint32_t *)(hashbuffer + rand)) = *((uint32_t *)(hashbuffer + j + randmax));
}
}
/*NOTE: this is bugged. This will probably be fixed in a later hard-forking update...
but not anytime soon, so remove it and take advantage of optimization *
//note: off-by-one error is likely here...
for(int i = size - 64 ; i >= 64; i -= 64)
sha256_hash512(hashbuffer + i - 64, hashbuffer + i);
*/
memcpy(hash, hashbuffer, 32);
}
int scanhash_pluck(int thr_id, uint32_t *pdata,
unsigned char *scratchbuf, const uint32_t *ptarget,
uint32_t max_nonce, unsigned long *hashes_done, int N)
{
uint32_t data[20], hash[8];
uint32_t S[16];
uint32_t n = pdata[19] - 1;
const uint32_t first_nonce = pdata[19];
const uint32_t Htarg = ptarget[7];
int throughput = 1;
int counti;
memcpy(data, pdata, 80);
for (int a = 0; a < 20; a++)
be32enc((uint32_t *)data + a, (((uint32_t*)pdata))[a]);
do
{
data[19] = ++n; //incrementing nonce
PluckHash(hash, data, scratchbuf, N);
if (hash[7] <= Htarg && fulltest(hash, ptarget))
{
*hashes_done = n - pdata[19] + 1;
pdata[19] = htobe32(data[19]);
return 1;
}
} while (n < max_nonce && !work_restart[thr_id].restart);
*hashes_done = n - first_nonce + 1;
pdata[19] = n;
return 0;
}