Hi ckolivas,

I´m still using a old PowerBook G4 laptop from Apple, the CPU has an SIMD unit, Altivec, very simular to the SSE unit on x86 processors. I´ve translated the 4way SSE code into Altivec code. My very first version is already working with jgarzik´s cpuminer, could you also add the code into the cgminer:

My sha256_altivec_4way.c file:

Code:

// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2011 Gilles Risch
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.

// 4-way 128-bit Altivec SHA-256,
// based on tcatm's 4-way 128-bit SSE2 SHA-256
//

#include "cpuminer-config.h"
#include "miner.h"

#ifdef WANT_ALTIVEC_4WAY

#include
#include

//#include
#include
#include

#define NPAR 32

static void DoubleBlockSHA256(const void* pin, void* pout, const void* pinit, unsigned int hash[8][NPAR], const void* init2);

static const unsigned int sha256_consts[] = {
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
};

static inline vector unsigned int Ch(const vector unsigned int b, const vector unsigned int c, const vector unsigned int d) {
return vec_sel(d,c,b);
}

static inline vector unsigned int Maj(const vector unsigned int b, const vector unsigned int c, const vector unsigned int d) {
return vec_sel(b,c, vec_xor(b,d));
}

/* RotateRight(x, n) := RotateLeft(x, 32-n) */
/* SHA256 Functions */
#define BIGSIGMA0_256(x) (vec_xor(vec_xor(vec_rl((x), (vector unsigned int)(32-2)),vec_rl((x), (vector unsigned int)(32-13))),vec_rl((x), (vector unsigned int)(32-22))))
#define BIGSIGMA1_256(x) (vec_xor(vec_xor(vec_rl((x), (vector unsigned int)(32-6)),vec_rl((x), (vector unsigned int)(32-11))),vec_rl((x), (vector unsigned int)(32-25))))

#define SIGMA0_256(x) (vec_xor(vec_xor(vec_rl((x), (vector unsigned int)(32- 7)),vec_rl((x), (vector unsigned int)(32-18))), vec_sr((x), (vector unsigned int)(3 ))))
#define SIGMA1_256(x) (vec_xor(vec_xor(vec_rl((x), (vector unsigned int)(32-17)),vec_rl((x), (vector unsigned int)(32-19))), vec_sr((x), (vector unsigned int)(10))))

#define add4(x0, x1, x2, x3) vec_add(vec_add(x0, x1),vec_add( x2,x3))
#define add5(x0, x1, x2, x3, x4) vec_add(add4(x0, x1, x2, x3), x4)

#define SHA256ROUND(a, b, c, d, e, f, g, h, i, w) \
T1 = add5(h, BIGSIGMA1_256(e), Ch(e, f, g), (vector unsigned int)(sha256_consts[i],sha256_consts[i],sha256_consts[i],sha256_consts[i]), w); \
d = vec_add(d, T1); \
h = vec_add(T1, vec_add(BIGSIGMA0_256(a), Maj(a, b, c)));

static const unsigned int pSHA256InitState[8] =
{0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};

unsigned int scanhash_altivec_4way(int thr_id, const unsigned char *pmidstate,
unsigned char *pdata,
unsigned char *phash1, unsigned char *phash,
const unsigned char *ptarget,
uint32_t max_nonce, unsigned long *nHashesDone)
{
unsigned int *nNonce_p = (unsigned int*)(pdata + 12);
unsigned int nonce = 0;

work_restart[thr_id].restart = 0;

for (;;)
{
unsigned int thash[9][NPAR] __attribute__((aligned(128)));
int j, ic;

*nNonce_p = nonce;

DoubleBlockSHA256(pdata, phash1, pmidstate, thash, pSHA256InitState);

for (j = 0; j < NPAR; j++)
{
if (unlikely(thash[7][j] == 0))
{
int i;

for (i = 0; i < 32/4; i++)
((unsigned int*)phash)[i] = thash[i][j];

if (fulltest(phash, ptarget)) {
*nHashesDone = nonce;
*nNonce_p = nonce + j;
return nonce + j;
}
}
}

if ((nonce >= max_nonce) || work_restart[thr_id].restart)
{
*nHashesDone = nonce;
return -1;
}

nonce += NPAR;
}
}

static void DoubleBlockSHA256(const void* pin, void* pad, const void *pre, unsigned int thash[9][NPAR], const void *init)
{
unsigned int* In = (unsigned int*)pin;
unsigned int* Pad = (unsigned int*)pad;
unsigned int* hPre = (unsigned int*)pre;
unsigned int* hInit = (unsigned int*)init;
unsigned int /* i, j, */ k;

/* vectors used in calculation */
vector unsigned int w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
vector unsigned int T1;
vector unsigned int a, b, c, d, e, f, g, h;
vector unsigned int nonce, preNonce;

/* nonce offset for vector */
vector unsigned int offset = (vector unsigned int)(0, 1, 2, 3);

preNonce = vec_add((vector unsigned int)(In[3],In[3],In[3],In[3]), offset);

for(k = 0; k {
w0 = (vector unsigned int)(In[0],In[0],In[0],In[0]);
w1 = (vector unsigned int)(In[1],In[1],In[1],In[1]);
w2 = (vector unsigned int)(In[2],In[2],In[2],In[2]);
//w3 = (vector unsigned int)(In[3],In[3],In[3],In[3]); nonce will be later hacked into the hash
w4 = (vector unsigned int)(In[4],In[4],In[4],In[4]);
w5 = (vector unsigned int)(In[5],In[5],In[5],In[5]);
w6 = (vector unsigned int)(In[6],In[6],In[6],In[6]);
w7 = (vector unsigned int)(In[7],In[7],In[7],In[7]);
w8 = (vector unsigned int)(In[8],In[8],In[8],In[8]);
w9 = (vector unsigned int)(In[9],In[9],In[9],In[9]);
w10 = (vector unsigned int)(In[10],In[10],In[10],In[10]);
w11 = (vector unsigned int)(In[11],In[11],In[11],In[11]);
w12 = (vector unsigned int)(In[12],In[12],In[12],In[12]);
w13 = (vector unsigned int)(In[13],In[13],In[13],In[13]);
w14 = (vector unsigned int)(In[14],In[14],In[14],In[14]);
w15 = (vector unsigned int)(In[15],In[15],In[15],In[15]);

/* hack nonce into lowest byte of w3 */
nonce = vec_add(preNonce, (vector unsigned int)(k,k,k,k));

w3 = nonce;
//printf ("W3: %08vlx\n", w3);

a = (vector unsigned int)(hPre[0],hPre[0],hPre[0],hPre[0]);
b = (vector unsigned int)(hPre[1],hPre[1],hPre[1],hPre[1]);
c = (vector unsigned int)(hPre[2],hPre[2],hPre[2],hPre[2]);
d = (vector unsigned int)(hPre[3],hPre[3],hPre[3],hPre[3]);
e = (vector unsigned int)(hPre[4],hPre[4],hPre[4],hPre[4]);
f = (vector unsigned int)(hPre[5],hPre[5],hPre[5],hPre[5]);
g = (vector unsigned int)(hPre[6],hPre[6],hPre[6],hPre[6]);
h = (vector unsigned int)(hPre[7],hPre[7],hPre[7],hPre[7]);

SHA256ROUND(a, b, c, d, e, f, g, h, 0, w0);
SHA256ROUND(h, a, b, c, d, e, f, g, 1, w1);
SHA256ROUND(g, h, a, b, c, d, e, f, 2, w2);
SHA256ROUND(f, g, h, a, b, c, d, e, 3, w3);
SHA256ROUND(e, f, g, h, a, b, c, d, 4, w4);
SHA256ROUND(d, e, f, g, h, a, b, c, 5, w5);
SHA256ROUND(c, d, e, f, g, h, a, b, 6, w6);
SHA256ROUND(b, c, d, e, f, g, h, a, 7, w7);
SHA256ROUND(a, b, c, d, e, f, g, h, 8, w8);
SHA256ROUND(h, a, b, c, d, e, f, g, 9, w9);
SHA256ROUND(g, h, a, b, c, d, e, f, 10, w10);
SHA256ROUND(f, g, h, a, b, c, d, e, 11, w11);
SHA256ROUND(e, f, g, h, a, b, c, d, 12, w12);
SHA256ROUND(d, e, f, g, h, a, b, c, 13, w13);
SHA256ROUND(c, d, e, f, g, h, a, b, 14, w14);
SHA256ROUND(b, c, d, e, f, g, h, a, 15, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 16, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 17, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 18, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 19, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 20, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 21, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 22, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 23, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 24, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 25, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 26, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 27, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 28, w12);
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 29, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 30, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 31, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 32, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 33, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 34, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 35, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 36, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 37, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 38, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 39, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 40, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 41, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 42, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 43, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 44, w12);
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 45, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 46, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 47, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 48, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 49, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 50, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 51, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 52, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 53, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 54, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 55, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 56, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 57, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 58, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 59, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 60, w12);
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 61, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 62, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 63, w15);

#define store_load(x, i, dest) \
T1 = (vector unsigned int)((hPre)[i],(hPre)[i],(hPre)[i],(hPre)[i]); \
dest = vec_add(T1, x);

store_load(a, 0, w0);
store_load(b, 1, w1);
store_load(c, 2, w2);
store_load(d, 3, w3);
store_load(e, 4, w4);
store_load(f, 5, w5);
store_load(g, 6, w6);
store_load(h, 7, w7);

/* end of first SHA256 round */

w8 = (vector unsigned int)(Pad[8],Pad[8],Pad[8],Pad[8]);
w9 = (vector unsigned int)(Pad[9],Pad[9],Pad[9],Pad[9]);
w10 = (vector unsigned int)(Pad[10],Pad[10],Pad[10],Pad[10]);
w11 = (vector unsigned int)(Pad[11],Pad[11],Pad[11],Pad[11]);
w12 = (vector unsigned int)(Pad[12],Pad[12],Pad[12],Pad[12]);
w13 = (vector unsigned int)(Pad[13],Pad[13],Pad[13],Pad[13]);
w14 = (vector unsigned int)(Pad[14],Pad[14],Pad[14],Pad[14]);
w15 = (vector unsigned int)(Pad[15],Pad[15],Pad[15],Pad[15]);

a = (vector unsigned int)(hInit[0],hInit[0],hInit[0],hInit[0]);
b = (vector unsigned int)(hInit[1],hInit[1],hInit[1],hInit[1]);
c = (vector unsigned int)(hInit[2],hInit[2],hInit[2],hInit[2]);
d = (vector unsigned int)(hInit[3],hInit[3],hInit[3],hInit[3]);
e = (vector unsigned int)(hInit[4],hInit[4],hInit[4],hInit[4]);
f = (vector unsigned int)(hInit[5],hInit[5],hInit[5],hInit[5]);
g = (vector unsigned int)(hInit[6],hInit[6],hInit[6],hInit[6]);
h = (vector unsigned int)(hInit[7],hInit[7],hInit[7],hInit[7]);

SHA256ROUND(a, b, c, d, e, f, g, h, 0, w0);
SHA256ROUND(h, a, b, c, d, e, f, g, 1, w1);
SHA256ROUND(g, h, a, b, c, d, e, f, 2, w2);
SHA256ROUND(f, g, h, a, b, c, d, e, 3, w3);
SHA256ROUND(e, f, g, h, a, b, c, d, 4, w4);
SHA256ROUND(d, e, f, g, h, a, b, c, 5, w5);
SHA256ROUND(c, d, e, f, g, h, a, b, 6, w6);
SHA256ROUND(b, c, d, e, f, g, h, a, 7, w7);
SHA256ROUND(a, b, c, d, e, f, g, h, 8, w8);
SHA256ROUND(h, a, b, c, d, e, f, g, 9, w9);
SHA256ROUND(g, h, a, b, c, d, e, f, 10, w10);
SHA256ROUND(f, g, h, a, b, c, d, e, 11, w11);
SHA256ROUND(e, f, g, h, a, b, c, d, 12, w12);
SHA256ROUND(d, e, f, g, h, a, b, c, 13, w13);
SHA256ROUND(c, d, e, f, g, h, a, b, 14, w14);
SHA256ROUND(b, c, d, e, f, g, h, a, 15, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 16, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 17, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 18, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 19, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 20, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 21, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 22, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 23, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 24, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 25, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 26, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 27, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 28, w12);
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 29, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 30, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 31, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 32, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 33, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 34, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 35, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 36, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 37, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 38, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 39, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 40, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 41, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 42, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 43, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 44, w12);
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 45, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 46, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 47, w15);

w0 = add4(SIGMA1_256(w14), w9, SIGMA0_256(w1), w0);
SHA256ROUND(a, b, c, d, e, f, g, h, 48, w0);
w1 = add4(SIGMA1_256(w15), w10, SIGMA0_256(w2), w1);
SHA256ROUND(h, a, b, c, d, e, f, g, 49, w1);
w2 = add4(SIGMA1_256(w0), w11, SIGMA0_256(w3), w2);
SHA256ROUND(g, h, a, b, c, d, e, f, 50, w2);
w3 = add4(SIGMA1_256(w1), w12, SIGMA0_256(w4), w3);
SHA256ROUND(f, g, h, a, b, c, d, e, 51, w3);
w4 = add4(SIGMA1_256(w2), w13, SIGMA0_256(w5), w4);
SHA256ROUND(e, f, g, h, a, b, c, d, 52, w4);
w5 = add4(SIGMA1_256(w3), w14, SIGMA0_256(w6), w5);
SHA256ROUND(d, e, f, g, h, a, b, c, 53, w5);
w6 = add4(SIGMA1_256(w4), w15, SIGMA0_256(w7), w6);
SHA256ROUND(c, d, e, f, g, h, a, b, 54, w6);
w7 = add4(SIGMA1_256(w5), w0, SIGMA0_256(w8), w7);
SHA256ROUND(b, c, d, e, f, g, h, a, 55, w7);
w8 = add4(SIGMA1_256(w6), w1, SIGMA0_256(w9), w8);
SHA256ROUND(a, b, c, d, e, f, g, h, 56, w8);
w9 = add4(SIGMA1_256(w7), w2, SIGMA0_256(w10), w9);
SHA256ROUND(h, a, b, c, d, e, f, g, 57, w9);
w10 = add4(SIGMA1_256(w8), w3, SIGMA0_256(w11), w10);
SHA256ROUND(g, h, a, b, c, d, e, f, 58, w10);
w11 = add4(SIGMA1_256(w9), w4, SIGMA0_256(w12), w11);
SHA256ROUND(f, g, h, a, b, c, d, e, 59, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 60, w12);

/* Skip last 3-rounds; not necessary for H==0 */
/*#if 0
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 61, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 62, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 63, w15);
#endif*/

/* store resulsts directly in thash */
#define store_2(x,i) \
w0 = (vector unsigned int)(hInit[i],hInit[i],hInit[i],hInit[i]); \
vec_st(vec_add(w0, x), 0 ,&thash[i][k]);

store_2(a, 0);
store_2(b, 1);
store_2(c, 2);
store_2(d, 3);
store_2(e, 4);
store_2(f, 5);
store_2(g, 6);
store_2(h, 7);

vec_st(nonce, 0 ,&thash[8][k]);
/* writing the results into the array is time intensive */
/* -> try if it´s faster to compare the results with the target inside this function */
}

}

#endif /* WANT_ALTIVEC_4WAY */

On my 1.5GHz G4 laptop I end up somewhere around 1100 khash/sec, not a lot, but better than the generic algo. The code should also word on G5's but I couldn't test due to the lack of hardware.

Beside of this file you must also change two functions inside the main.c file because the code is for little-endian machines and the PowerPc is big-endian:

Code:

static bool work_decode(const json_t *val, struct work *work) {
if (unlikely(!jobj_binary(val, "midstate",
work->midstate, sizeof (work->midstate)))) {
applog(LOG_ERR, "JSON inval midstate");
goto err_out;
}

if (unlikely(!jobj_binary(val, "data", work->data, sizeof (work->data)))) {
applog(LOG_ERR, "JSON inval data");
goto err_out;
}

if (unlikely(!jobj_binary(val, "hash1", work->hash1, sizeof (work->hash1)))) {
applog(LOG_ERR, "JSON inval hash1");
goto err_out;
}

if (unlikely(!jobj_binary(val, "target", work->target, sizeof (work->target)))) {
applog(LOG_ERR, "JSON inval target");
goto err_out;
}

memset(work->hash, 0, sizeof (work->hash));

#ifdef __BIG_ENDIAN__
int swapcounter = 0;
for (swapcounter = 0; swapcounter < 32; swapcounter++)
(((uint32_t*) (work->data))[swapcounter]) = swab32(((uint32_t*) (work->data))[swapcounter]);
for (swapcounter = 0; swapcounter < 16; swapcounter++)
(((uint32_t*) (work->hash1))[swapcounter]) = swab32(((uint32_t*) (work->hash1))[swapcounter]);
for (swapcounter = 0; swapcounter < 8; swapcounter++)
(((uint32_t*) (work->midstate))[swapcounter]) = swab32(((uint32_t*) (work->midstate))[swapcounter]);
for (swapcounter = 0; swapcounter < 8; swapcounter++)
(((uint32_t*) (work->target))[swapcounter]) = swab32(((uint32_t*) (work->target))[swapcounter]);
#endif

return true;

err_out:
return false;
}

static bool submit_upstream_work(CURL *curl, const struct work *work) {
char *hexstr = NULL;
json_t *val, *res;
char s[345];
bool rc = false;

#ifdef __BIG_ENDIAN__
int swapcounter;
for (swapcounter = 0; swapcounter < 32; swapcounter++)
(((uint32_t*) (work->data))[swapcounter]) = swab32(((uint32_t*) (work->data))[swapcounter]);
#endif

/* build hex string */
hexstr = bin2hex(work->data, sizeof (work->data));
if (unlikely(!hexstr)) {
applog(LOG_ERR, "submit_upstream_work OOM");
goto out;
}

/* build JSON-RPC request */
sprintf(s,
"{\"method\": \"getwork\", \"params\": [ \"%s\" ], \"id\":1}\r\n",
hexstr);

if (opt_debug)
applog(LOG_DEBUG, "DBG: sending RPC call: %s", s);

/* issue JSON-RPC request */
val = json_rpc_call(curl, rpc_url, rpc_userpass, s, false, false);
if (unlikely(!val)) {
applog(LOG_ERR, "submit_upstream_work json_rpc_call failed");
goto out;
}

res = json_object_get(val, "result");

applog(LOG_INFO, "PROOF OF WORK RESULT: %s",
json_is_true(res) ? "true (yay!!!)" : "false (booooo)");

json_decref(val);

rc = true;

out:
free(hexstr);
return rc;
}

These changes could also be useful if you like to use the cgminer on big-endian ARM cpu's.

Regards,
Gilles

Roodemol

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