diff --git a/Makefile.am b/Makefile.am
index 6a24a21b..cb7bf850 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,6 +24,7 @@ cgminer_SOURCES	= elist.h miner.h compat.h bench_block.h	\
 		  sha256_generic.c sha256_4way.c sha256_via.c	\
 		  sha256_cryptopp.c sha256_sse2_amd64.c		\
 		  sha256_sse4_amd64.c sha256_sse2_i386.c	\
+		  sha256_altivec_4way.c				\
 		  adl.c	adl.h adl_functions.h			\
 		  phatk110817.cl poclbm110817.cl \
 		  sha2.c sha2.h
diff --git a/configure.ac b/configure.ac
index bf9acbb4..333c490d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,6 +83,11 @@ case $target in
     DLOPEN_FLAGS=""
     WS2_LIBS="-lws2_32"
     ;;
+  powerpc-*-darwin*)
+    CFLAGS="$CFLAGS -faltivec"
+    OPENCL_LIBS=""
+    PTHREAD_FLAGS=""
+    ;;
   *-*-darwin*)
     OPENCL_LIBS="-framework OpenCL"
 	;;
diff --git a/main.c b/main.c
index 91197d41..28436799 100644
--- a/main.c
+++ b/main.c
@@ -106,6 +106,7 @@ enum sha256_algos {
 	ALGO_SSE2_32,		/* SSE2 for x86_32 */
 	ALGO_SSE2_64,		/* SSE2 for x86_64 */
 	ALGO_SSE4_64,		/* SSE4 for x86_64 */
+    ALGO_ALTIVEC_4WAY, /* parallel Altivec */
 };
 
 enum pool_strategy {
@@ -149,6 +150,9 @@ static const char *algo_names[] = {
 #ifdef WANT_X8664_SSE4
 	[ALGO_SSE4_64]		= "sse4_64",
 #endif
+#ifdef WANT_ALTIVEC_4WAY
+    [ALGO_ALTIVEC_4WAY] = "altivec_4way",
+#endif
 };
 
 typedef void (*sha256_func)();
@@ -157,6 +161,9 @@ static const sha256_func sha256_funcs[] = {
 #ifdef WANT_SSE2_4WAY
 	[ALGO_4WAY]		= (sha256_func)ScanHash_4WaySSE2,
 #endif
+#ifdef WANT_ALTIVEC_4WAY
+    [ALGO_ALTIVEC_4WAY] = (sha256_func) ScanHash_altivec_4way,
+#endif
 #ifdef WANT_VIA_PADLOCK
 	[ALGO_VIA]		= (sha256_func)scanhash_via,
 #endif
@@ -896,6 +903,10 @@ static enum sha256_algos pick_fastest_algo()
 		bench_algo(&best_rate, &best_algo, ALGO_SSE4_64);
 	#endif
 
+        #if defined(WANT_ALTIVEC_4WAY)
+                bench_algo(&best_rate, &best_algo, ALGO_ALTIVEC_4WAY);
+        #endif
+
 	size_t n = max_name_len - strlen(algo_names[best_algo]);
 	memset(name_spaces_pad, ' ', n);
 	name_spaces_pad[n] = 0;
@@ -1451,6 +1462,9 @@ static struct opt_table opt_config_table[] = {
 #endif
 #ifdef WANT_X8664_SSE4
 		     "\n\tsse4_64\t\tSSE4.1 64 bit implementation for x86_64 machines"
+#endif
+#ifdef WANT_ALTIVEC_4WAY
+    "\n\taltivec_4way\tAltivec implementation for PowerPC G4 and G5 machines"
 #endif
 		),
 #ifdef HAVE_ADL
@@ -1787,6 +1801,19 @@ static bool work_decode(const json_t *val, struct work *work)
 	}
 
 	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
+
 	gettimeofday(&work->tv_staged, NULL);
 
 	return true;
@@ -2141,6 +2168,12 @@ static bool submit_upstream_work(const struct work *work)
 		return rc;
 	}
 
+#ifdef __BIG_ENDIAN__
+        int swapcounter = 0;
+        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)) {
@@ -4081,6 +4114,19 @@ static void *miner_thread(void *userdata)
 			break;
 #endif
 
+#ifdef WANT_ALTIVEC_4WAY
+            case ALGO_ALTIVEC_4WAY:
+            {
+                unsigned int rc4 = ScanHash_altivec_4way(thr_id, work->midstate, work->data + 64,
+                        work->hash1, work->hash,
+                        work->target,
+                        max_nonce, &hashes_done,
+                        work->blk.nonce);
+                rc = (rc4 == -1) ? false : true;
+            }
+                break;
+#endif
+
 #ifdef WANT_VIA_PADLOCK
 		case ALGO_VIA:
 			rc = scanhash_via(thr_id, work->data, work->target,
diff --git a/miner.h b/miner.h
index c21f1893..f187268d 100644
--- a/miner.h
+++ b/miner.h
@@ -64,6 +64,10 @@ void *alloca (size_t);
 #define WANT_SSE2_4WAY 1
 #endif
 
+#ifdef __ALTIVEC__
+#define WANT_ALTIVEC_4WAY 1
+#endif
+
 #if defined(__i386__) && defined(HAS_YASM) && defined(__SSE2__)
 #define WANT_X8632_SSE2 1
 #endif
@@ -329,6 +333,12 @@ extern unsigned int ScanHash_4WaySSE2(int, const unsigned char *pmidstate,
 	const unsigned char *ptarget,
 	uint32_t max_nonce, unsigned long *nHashesDone, uint32_t nonce);
 
+extern 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, uint32_t nonce);
+
 extern unsigned int scanhash_sse2_amd64(int, const unsigned char *pmidstate,
 	unsigned char *pdata, unsigned char *phash1, unsigned char *phash,
 	const unsigned char *ptarget,
@@ -342,14 +352,17 @@ extern bool scanhash_c(int, const unsigned char *midstate, unsigned char *data,
 	      unsigned char *hash1, unsigned char *hash,
 	      const unsigned char *target,
 	      uint32_t max_nonce, unsigned long *hashes_done, uint32_t n);
+
 extern bool scanhash_cryptopp(int, const unsigned char *midstate,unsigned char *data,
 	      unsigned char *hash1, unsigned char *hash,
 	      const unsigned char *target,
 	      uint32_t max_nonce, unsigned long *hashes_done, uint32_t n);
+
 extern bool scanhash_asm32(int, const unsigned char *midstate,unsigned char *data,
 	      unsigned char *hash1, unsigned char *hash,
 	      const unsigned char *target,
 	      uint32_t max_nonce, unsigned long *hashes_done, uint32_t nonce);
+
 extern int scanhash_sse2_64(int, const unsigned char *pmidstate, unsigned char *pdata,
 	unsigned char *phash1, unsigned char *phash,
 	const unsigned char *ptarget,
diff --git a/sha256_altivec_4way.c b/sha256_altivec_4way.c
new file mode 100644
index 00000000..41dc5a09
--- /dev/null
+++ b/sha256_altivec_4way.c
@@ -0,0 +1,469 @@
+// 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 "config.h"
+#include "miner.h"
+
+#ifdef WANT_ALTIVEC_4WAY
+
+#include <string.h>
+#include <assert.h>
+
+//#include <altivec.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#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,
+	uint32_t nonce)
+{
+    unsigned int *nNonce_p = (unsigned int*)(pdata + 12);
+    
+    work_restart[thr_id].restart = 0;
+
+    for (;;)
+    {
+        unsigned int thash[9][NPAR] __attribute__((aligned(128)));
+	int j;
+
+	*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<NPAR; k+=4)
+   {
+        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 */
+