thodg/cgminer/sha256_sse2_i386.c

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• Hash : b9d197de
  Author :
  Date : 2012-01-17T16:29:01
  

  Refactor the CPU scanhash_* functions to use a common API. Fixes bugs. - Before, some returned bool, and others returned int (which was then turned into a bool with a comparison); now, everything returns a bool - Before, some set hashes_done to nonce - 1 when a share was found and others set it to nonce + 1 or 2. This caused some algorithms to scan/submit shares twice with the new cpu_scanhash function. Now, it has all been replaced with last_nonce, which is set to the final nonce checked by the scanhash_* func. - VIA needs the full data, and cannot use midstate. All the others were expecting midstate and data+64 for their parameters. Now, we pass midstate and the full data pointer, and let the scanhash_* function choose which to use.

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• sha256_sse2_i386.c

• /*
   * SHA-256 driver for ASM routine for x86_64 on Linux
   * Copyright (c) Mark Crichton <crichton@gimp.org>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 2 of the License, or (at your option)
   * any later version.
   *
   */
  
  #include "config.h"
  
  #include "miner.h"
  
  #ifdef WANT_X8632_SSE2
  
  #include <string.h>
  #include <assert.h>
  
  #include <xmmintrin.h>
  #include <stdint.h>
  #include <stdio.h>
  
  extern void CalcSha256_x86 (__m128i *res, __m128i *data, const uint32_t init[8])__attribute__((fastcall));
  
  static uint32_t g_sha256_k[]__attribute__((aligned(0x100))) = {
      0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, /*  0 */
      0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
      0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, /*  8 */
      0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
      0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, /* 16 */
      0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
      0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, /* 24 */
      0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
      0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, /* 32 */
      0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
      0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, /* 40 */
      0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
      0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, /* 48 */
      0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
      0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, /* 56 */
      0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
  };
  
  
  const uint32_t sha256_32init[8]__attribute__((aligned(0x100))) =
  {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
  
  __m128i g_4sha256_k[64];
  __m128i sha256_consts_m128i[64]__attribute__((aligned(0x1000)));
  
  bool scanhash_sse2_32(int thr_id, const unsigned char *pmidstate,
  	unsigned char *pdata,
  	unsigned char *phash1, unsigned char *phash,
  	const unsigned char *ptarget,
  	uint32_t max_nonce, uint32_t *last_nonce,
  	uint32_t nonce)
  {
      uint32_t *nNonce_p = (uint32_t *)(pdata + 76);
      uint32_t m_midstate[8], m_w[16], m_w1[16];
      __m128i m_4w[64] __attribute__ ((aligned (0x100)));
      __m128i m_4hash[64] __attribute__ ((aligned (0x100)));
      __m128i m_4hash1[64] __attribute__ ((aligned (0x100)));
      __m128i offset;
      int i;
  
  	pdata += 64;
  
      work_restart[thr_id].restart = 0;
  
      /* For debugging */
      union {
          __m128i m;
          uint32_t i[4];
      } mi;
  
      /* Message expansion */
      memcpy(m_midstate, pmidstate, sizeof(m_midstate));
      memcpy(m_w, pdata, sizeof(m_w)); /* The 2nd half of the data */
      memcpy(m_w1, phash1, sizeof(m_w1));
      memset(m_4hash, 0, sizeof(m_4hash));
  
      /* Transmongrify */
      for (i = 0; i < 16; i++)
          m_4w[i] = _mm_set1_epi32(m_w[i]);
  
      for (i = 0; i < 16; i++)
          m_4hash1[i] = _mm_set1_epi32(m_w1[i]);
  
      for (i = 0; i < 64; i++)
  	sha256_consts_m128i[i] = _mm_set1_epi32(g_sha256_k[i]);
  
      offset = _mm_set_epi32(0x3, 0x2, 0x1, 0x0);
  
      for (;;)
      {
  	int j;
  
  	m_4w[3] = _mm_add_epi32(offset, _mm_set1_epi32(nonce));
  
  	/* Some optimization can be done here W.R.T. precalculating some hash */
  	CalcSha256_x86 (m_4hash1, m_4w, m_midstate);
  	CalcSha256_x86 (m_4hash, m_4hash1, sha256_32init);
  
  	for (j = 0; j < 4; j++) {
  	    mi.m = m_4hash[7];
  	    if (unlikely(mi.i[j] == 0))
  		break;
          }
  
  	/* If j = true, we found a hit...so check it */
  	/* Use the C version for a check... */
  	if (unlikely(j != 4)) {
  		for (i = 0; i < 8; i++) {
  		    mi.m = m_4hash[i];
  		    *(uint32_t *)&(phash)[i*4] = mi.i[j];
  		}
  
  		if (fulltest(phash, ptarget)) {
  		     nonce += j;
  		     *last_nonce = nonce;
  		     *nNonce_p = nonce;
  		     return true;
  		}
  	}
  
  	if (unlikely((nonce >= max_nonce) || work_restart[thr_id].restart)) {
  		*last_nonce = nonce;
  		return false;
  	}
  
  	nonce += 4;
  
     }
  }
  
  #endif /* WANT_X8632_SSE2 */
  
  

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