diff --git a/Makefile.am b/Makefile.am
index a7b09fa..2c149d0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,7 @@ bin_PROGRAMS	= minerd
 
 EXTRA_DIST	= sha256_generic.c
 
-minerd_SOURCES	= util.c cpu-miner.c miner.h compat.h
+minerd_SOURCES	= cpu-miner.c sha256_4way.c util.c miner.h compat.h
 minerd_LDFLAGS	= $(PTHREAD_FLAGS)
 minerd_LDADD	= @LIBCURL@ @JANSSON_LIBS@ @PTHREAD_LIBS@
 
diff --git a/README b/README
index 40dafb1..01455c1 100644
--- a/README
+++ b/README
@@ -15,7 +15,7 @@ Basic *nix build instructions:
 
 Basic WIN32 build instructions (on Fedora 13; requires mingw32):
 	./autogen.sh
-	mingw32-configure
+	MINGW32_CFLAGS="-O2 -Wall -msse2 -g" mingw32-configure
 	make
 	./mknsis.sh
 
diff --git a/cpu-miner.c b/cpu-miner.c
index 45e4e55..052c3fe 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -36,10 +36,16 @@ enum {
 	STAT_CTR_INTERVAL		= 10000000,
 };
 
+enum sha256_algos {
+	ALGO_C,
+	ALGO_4WAY
+};
+
 static bool opt_debug;
 bool opt_protocol = false;
 static bool program_running = true;
 static const bool opt_time = true;
+static enum sha256_algos opt_algo = ALGO_C;
 static int opt_n_threads = 1;
 static pthread_mutex_t stats_mutex = PTHREAD_MUTEX_INITIALIZER;
 static uint64_t hash_ctr;
@@ -56,6 +62,14 @@ static struct option_help options_help[] = {
 	{ "help",
 	  "(-h) Display this help text" },
 
+	{ "algo",
+	  "(-a) Specify sha256 implementation:\n"
+	  "\tc\t\tLinux kernel sha256, implemented in C"
+#ifdef __SSE__
+	  "\n\t4way\t\ttcatm's 4-way SSE2 implementation"
+#endif
+	  },
+
 	{ "debug",
 	  "(-D) Enable debug output" },
 
@@ -76,6 +90,7 @@ static struct option_help options_help[] = {
 
 static struct option options[] = {
 	{ "help", 0, NULL, 'h' },
+	{ "algo", 1, NULL, 'a' },
 	{ "debug", 0, NULL, 'D' },
 	{ "protocol-dump", 0, NULL, 'P' },
 	{ "threads", 1, NULL, 't' },
@@ -276,8 +291,19 @@ static void *miner_thread(void *dummy)
 		json_decref(val);
 
 		/* scan nonces for a proof-of-work hash */
-		rc = scanhash(work.midstate, work.data + 64,
-			      work.hash1, work.hash);
+		if (opt_algo == ALGO_C)
+			rc = scanhash(work.midstate, work.data + 64,
+				      work.hash1, work.hash);
+#ifdef __SSE__
+		else {
+			unsigned int hashesdone = 0;
+			unsigned int rc4 =
+				ScanHash_4WaySSE2(work.midstate, work.data + 64,
+						  work.hash1, work.hash,
+						  &hashesdone);
+			rc = (rc4 == -1) ? false : true;
+		}
+#endif
 
 		/* if nonce found, submit work */
 		if (rc)
@@ -307,6 +333,16 @@ static void parse_arg (int key, char *arg)
 	int v;
 
 	switch(key) {
+	case 'a':
+		if (!strcmp(arg, "c"))
+			opt_algo = ALGO_C;
+#ifdef __SSE__
+		else if (!strcmp(arg, "4way"))
+			opt_algo = ALGO_4WAY;
+#endif
+		else
+			show_usage();
+		break;
 	case 'D':
 		opt_debug = true;
 		break;
@@ -343,7 +379,7 @@ static void parse_cmdline(int argc, char *argv[])
 	int key;
 
 	while (1) {
-		key = getopt_long(argc, argv, "DPt:h?", options, NULL);
+		key = getopt_long(argc, argv, "a:DPt:h?", options, NULL);
 		if (key < 0)
 			break;
 
diff --git a/miner.h b/miner.h
index dc84c1c..b4cc939 100644
--- a/miner.h
+++ b/miner.h
@@ -14,4 +14,8 @@ extern json_t *json_rpc_call(const char *url, const char *userpass,
 extern char *bin2hex(unsigned char *p, size_t len);
 extern bool hex2bin(unsigned char *p, const char *hexstr, size_t len);
 
+extern unsigned int ScanHash_4WaySSE2(unsigned char *pmidstate,
+	unsigned char *pdata, unsigned char *phash1, unsigned char *phash,
+	unsigned int *nHashesDone);
+
 #endif /* __MINER_H__ */
diff --git a/sha256_4way.c b/sha256_4way.c
new file mode 100644
index 0000000..56132ff
--- /dev/null
+++ b/sha256_4way.c
@@ -0,0 +1,469 @@
+// Copyright (c) 2010 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+// tcatm's 4-way 128-bit SSE2 SHA-256
+
+#ifdef __SSE__
+
+#include <string.h>
+#include <assert.h>
+
+#include <xmmintrin.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 __m128i Ch(const __m128i b, const __m128i c, const __m128i d) {
+    return (b & c) ^ (~b & d);
+}
+
+static inline __m128i Maj(const __m128i b, const __m128i c, const __m128i d) {
+    return (b & c) ^ (b & d) ^ (c & d);
+}
+
+static inline __m128i ROTR(__m128i x, const int n) {
+    return _mm_srli_epi32(x, n) | _mm_slli_epi32(x, 32 - n);
+}
+
+static inline __m128i SHR(__m128i x, const int n) {
+    return _mm_srli_epi32(x, n);
+}
+
+/* SHA256 Functions */
+#define BIGSIGMA0_256(x)    (ROTR((x), 2) ^ ROTR((x), 13) ^ ROTR((x), 22))
+#define BIGSIGMA1_256(x)    (ROTR((x), 6) ^ ROTR((x), 11) ^ ROTR((x), 25))
+#define SIGMA0_256(x)       (ROTR((x), 7) ^ ROTR((x), 18) ^ SHR((x), 3))
+#define SIGMA1_256(x)       (ROTR((x), 17) ^ ROTR((x), 19) ^ SHR((x), 10))
+
+static inline unsigned int store32(const __m128i x, int i) {
+    union { unsigned int ret[4]; __m128i x; } box;
+    box.x = x;
+    return box.ret[i];
+}
+
+static inline void store_epi32(const __m128i x, unsigned int *x0, unsigned int *x1, unsigned int *x2, unsigned int *x3) {
+    union { unsigned int ret[4]; __m128i x; } box;
+    box.x = x;
+    *x0 = box.ret[3]; *x1 = box.ret[2]; *x2 = box.ret[1]; *x3 = box.ret[0];
+}
+
+#define add4(x0, x1, x2, x3) _mm_add_epi32(_mm_add_epi32(_mm_add_epi32(x0, x1), x2), x3)
+#define add5(x0, x1, x2, x3, x4) _mm_add_epi32(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), _mm_set1_epi32(sha256_consts[i]), w);   \
+d = _mm_add_epi32(d, T1);                                           \
+h = _mm_add_epi32(T1, _mm_add_epi32(BIGSIGMA0_256(a), Maj(a, b, c)));
+
+static inline void dumpreg(__m128i x, char *msg) {
+    union { unsigned int ret[4]; __m128i x; } box;
+    box.x = x ;
+    printf("%s %08x %08x %08x %08x\n", msg, box.ret[0], box.ret[1], box.ret[2], box.ret[3]);
+}
+
+#if 1
+#define dumpstate(i) printf("%s: %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", \
+        __func__, store32(w0, i), store32(a, i), store32(b, i), store32(c, i), store32(d, i), store32(e, i), store32(f, i), store32(g, i), store32(h, i));
+#else
+#define dumpstate()
+#endif
+
+static const unsigned int pSHA256InitState[8] =
+{0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
+
+
+unsigned int ScanHash_4WaySSE2(unsigned char *pmidstate, unsigned char *pdata,
+	unsigned char *phash1, unsigned char *phash, unsigned int *nHashesDone)
+{
+    unsigned int *nNonce_p = (unsigned int*)(pdata + 12);
+    unsigned int nonce = 0;
+
+    for (;;)
+    {
+        unsigned int thash[9][NPAR] __attribute__((aligned(128)));
+	int j;
+
+	nonce += NPAR;
+	*nNonce_p = nonce;
+
+        DoubleBlockSHA256(pdata, phash1, pmidstate, thash, pSHA256InitState);
+
+        for (j = 0; j < NPAR; j++)
+        {
+            if (thash[7][j] == 0)
+            {
+		int i;
+
+                for (i = 0; i < 32/4; i++)
+                    ((unsigned int*)phash)[i] = thash[i][j];
+                return nonce + j;
+            }
+        }
+
+        if ((nonce & 0xffff) == 0)
+        {
+            *nHashesDone = 0xffff+1;
+            return -1;
+        }
+    }
+}
+
+
+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 */
+    __m128i w0, w1, w2, w3, w4, w5, w6, w7;
+    __m128i w8, w9, w10, w11, w12, w13, w14, w15;
+    __m128i T1;
+    __m128i a, b, c, d, e, f, g, h;
+    __m128i nonce;
+
+    /* nonce offset for vector */
+    __m128i offset = _mm_set_epi32(0x00000003, 0x00000002, 0x00000001, 0x00000000);
+
+
+    for(k = 0; k<NPAR; k+=4) {
+        w0 = _mm_set1_epi32(In[0]);
+        w1 = _mm_set1_epi32(In[1]);
+        w2 = _mm_set1_epi32(In[2]);
+        //w3 = _mm_set1_epi32(In[3]); nonce will be later hacked into the hash
+        w4 = _mm_set1_epi32(In[4]);
+        w5 = _mm_set1_epi32(In[5]);
+        w6 = _mm_set1_epi32(In[6]);
+        w7 = _mm_set1_epi32(In[7]);
+        w8 = _mm_set1_epi32(In[8]);
+        w9 = _mm_set1_epi32(In[9]);
+        w10 = _mm_set1_epi32(In[10]);
+        w11 = _mm_set1_epi32(In[11]);
+        w12 = _mm_set1_epi32(In[12]);
+        w13 = _mm_set1_epi32(In[13]);
+        w14 = _mm_set1_epi32(In[14]);
+        w15 = _mm_set1_epi32(In[15]);
+
+        /* hack nonce into lowest byte of w3 */
+        nonce = _mm_set1_epi32(In[3]);
+        nonce = _mm_add_epi32(nonce, offset);
+        nonce = _mm_add_epi32(nonce, _mm_set1_epi32(k));
+        w3 = nonce;
+
+        a = _mm_set1_epi32(hPre[0]);
+        b = _mm_set1_epi32(hPre[1]);
+        c = _mm_set1_epi32(hPre[2]);
+        d = _mm_set1_epi32(hPre[3]);
+        e = _mm_set1_epi32(hPre[4]);
+        f = _mm_set1_epi32(hPre[5]);
+        g = _mm_set1_epi32(hPre[6]);
+        h = _mm_set1_epi32(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 = _mm_set1_epi32((hPre)[i]); \
+        dest = _mm_add_epi32(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);
+
+        w8 = _mm_set1_epi32(Pad[8]);
+        w9 = _mm_set1_epi32(Pad[9]);
+        w10 = _mm_set1_epi32(Pad[10]);
+        w11 = _mm_set1_epi32(Pad[11]);
+        w12 = _mm_set1_epi32(Pad[12]);
+        w13 = _mm_set1_epi32(Pad[13]);
+        w14 = _mm_set1_epi32(Pad[14]);
+        w15 = _mm_set1_epi32(Pad[15]);
+
+        a = _mm_set1_epi32(hInit[0]);
+        b = _mm_set1_epi32(hInit[1]);
+        c = _mm_set1_epi32(hInit[2]);
+        d = _mm_set1_epi32(hInit[3]);
+        e = _mm_set1_epi32(hInit[4]);
+        f = _mm_set1_epi32(hInit[5]);
+        g = _mm_set1_epi32(hInit[6]);
+        h = _mm_set1_epi32(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);
+        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);
+
+        /* store resulsts directly in thash */
+#define store_2(x,i)  \
+        w0 = _mm_set1_epi32(hInit[i]); \
+        *(__m128i *)&(thash)[i][0+k] = _mm_add_epi32(w0, x);
+
+        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);
+        *(__m128i *)&(thash)[8][0+k] = nonce;
+    }
+
+}
+
+#endif /* __SSE__ */