Here are my neoscrypt.cl and sgminer configurations for 7950 and 280x. I use the 14.6 driver, found no difference using 14.7.
My 7950 does 320KHs at GPU clock 1000 MHz, memclock 1250 MHz, 1.081V GPU core voltage
My 280X does 360KHs at GPU clock 1036 MHz, memclock 1500 MHz, 1.025V GPU core voltage
The XORBYTESINPLACE needs to change depending on 280X or 7950. It hashes higher one way vs another for the card used, I have not examined as to why. So, edit the neoscrypt.cl file and look at the xorbytesinplace function. Change the section to match the card you are using, by changing what is commented out or in.
7950 config:
sgminer.exe -k neoscrypt --worksize 64 --rawintensity 4584 -g 4 -o stratum+tcp://stratum.ftc.theblocksfactory.com:3333 -u USER -p PASSWORD
280X config
sgminer.exe -k neoscrypt --worksize 64 --rawintensity 5120 -g 4 -o stratum+tcp://stratum.ftc.theblocksfactory.com:3333 -u USER -p PASSWORD
Feel free to criticize and / or offer up improvements. Basically, I have about 9 hours of OpenCL programming experience, I don't claim to be an expert by any means. I only claim to be 20% faster than the POS neoscrypt.cl file on Nicehash. Whoever posted that certainly wouldn't qualify as an expert either.
Last time I played with this stuff, I made other changes which make a 7950 run at 355KHs, 1000MHz GPU, 1250 Memclock. But that was a bit unstable, 3% HW errors. If I get around to playing with it and get it clean and stable, I will post up new code and config. Relatively speaking, this would then push the 280X to near 400Khs at 1036Mhz.
Donations: 1D4yYxmH44Xg4J2GuQ5ppfUKS7ohiJaD21
/* NeoScrypt(128, 2, 1) with Salsa20/20 and ChaCha20/20 */
/* Adapted and improved for 14.x drivers by Wolf9466 (Wolf`) */
// Stupid AMD compiler ignores the unroll pragma in these two
#define SALSA_SMALL_UNROLL 3
#define CHACHA_SMALL_UNROLL 3
// If SMALL_BLAKE2S is defined, BLAKE2S_UNROLL is interpreted
// as the unroll factor; must divide cleanly into ten.
// Usually a bad idea.
// #define SMALL_BLAKE2S
// #define BLAKE2S_UNROLL 5
#define BLOCK_SIZE 64U
#define FASTKDF_BUFFER_SIZE 256U
#ifndef PASSWORD_LEN
#define PASSWORD_LEN 80U
#endif
#if !defined(cl_khr_byte_addressable_store)
#error "Device does not support unaligned stores"
#endif
void CopyBytes(void *restrict dst, const void *restrict src, uint len)
{
for(int i = 0; i < len; ++i)
((uchar *)dst)[i] = ((uchar *)src)[i];
}
void CopyBytes32(void *restrict dst, const void *restrict src)
{
#pragma unroll 4
for(int i = 31; i > 0; i-=8)
{
((uchar *)dst)[i] = ((uchar *)src)[i];
((uchar *)dst)[i-1] = ((uchar *)src)[i-1];
((uchar *)dst)[i-2] = ((uchar *)src)[i-2];
((uchar *)dst)[i-3] = ((uchar *)src)[i-3];
((uchar *)dst)[i-4] = ((uchar *)src)[i-4];
((uchar *)dst)[i-5] = ((uchar *)src)[i-5];
((uchar *)dst)[i-6] = ((uchar *)src)[i-6];
((uchar *)dst)[i-7] = ((uchar *)src)[i-7];
}
}
void CopyBytes64(void *restrict dst, const void *restrict src)
{
#pragma unroll 8
for(int i = 63; i > 0; i-=8)
{
((uchar *)dst)[i] = ((uchar *)src)[i];
((uchar *)dst)[i-1] = ((uchar *)src)[i-1];
((uchar *)dst)[i-2] = ((uchar *)src)[i-2];
((uchar *)dst)[i-3] = ((uchar *)src)[i-3];
((uchar *)dst)[i-4] = ((uchar *)src)[i-4];
((uchar *)dst)[i-5] = ((uchar *)src)[i-5];
((uchar *)dst)[i-6] = ((uchar *)src)[i-6];
((uchar *)dst)[i-7] = ((uchar *)src)[i-7];
}
}
void XORBytesInPlace(void *restrict dst, const void *restrict src, uchar bufidx)
{
/*
// for 7950
switch(bufidx & 0x03)
{
case 0:
((ulong4 *)dst)[0] ^= ((ulong4 *)src)[0];
break;
// end for 7950
*/
// for 280X
switch( bufidx & 0x03)
{
case 0:
#pragma unroll 2
for(int i = 0; i < 4; i+=2)
{
((uint2 *)dst)[i] ^= ((uint2 *)src)[i];
((uint2 *)dst)[i+1] ^= ((uint2 *)src)[i+1];
}
break;
case 2:
#pragma unroll 8
for(int i = 0; i < 16; i+=2)
{
((uchar2 *)dst)[i] ^= ((uchar2 *)src)[i];
((uchar2 *)dst)[i+1] ^= ((uchar2 *)src)[i+1];
}
break;
// end for 280X
default:
#pragma unroll 8
for(int i = 0; i < 32; i+=4)
{
((uchar *)dst)[i] ^= ((uchar *)src)[i];
((uchar *)dst)[i+1] ^= ((uchar *)src)[i+1];
((uchar *)dst)[i+2] ^= ((uchar *)src)[i+2];
((uchar *)dst)[i+3] ^= ((uchar *)src)[i+3];
}
}
}
void XORBytes(void *restrict dst, const void *restrict src1, const void *restrict src2, uint len)
{
#pragma unroll 1
for(int i = 0; i < len; ++i)
((uchar *)dst)[i] = ((uchar *)src1)[i] ^ ((uchar *)src2)[i];
}
// Blake2S
#define BLAKE2S_BLOCK_SIZE 64U
#define BLAKE2S_OUT_SIZE 32U
#define BLAKE2S_KEY_SIZE 32U
static const __constant uint BLAKE2S_IV_1[16] =
{
0x6B08C647, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19,
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E523F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
};
static const __constant uint BLAKE2S_IV_2[8] =
{
0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
0x510E52FF, 0x9B05688C, 0xE07C2654, 0x5BE0CD19
};
static const __constant uchar BLAKE2S_SIGMA[10][16] =
{
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
};
#define BLAKE_G(idx0, idx1, a, b, c, d, key) do { \
for(int i=0; i< 2; ++i) {\
a += b + key[BLAKE2S_SIGMA[idx0][idx1 + i]]; \
d = rotate(d ^ a, ( i << 3 )+16U ); \
c += d; \
b = rotate(b ^ c, ( i + (i<<2))+20U) ; \
}\
} while(0)
void Blake2S(uint *restrict inout, const uint *restrict inkey)
{
uint16 V;
uint8 tmpblock;
// Load first block (IV into V.lo) and constants (IV into V.hi)
V = vload16(0U, BLAKE2S_IV_1);
tmpblock = V.lo;
// Compress state, using the key as the key
#ifdef SMALL_BLAKE2S
#pragma unroll BLAKE2S_UNROLL
#else
#pragma unroll 10
#endif
for(int x = 0; x < 10; ++x)
{
BLAKE_G(x, 0x00, V.s0, V.s4, V.s8, V.sc, inkey);
BLAKE_G(x, 0x02, V.s1, V.s5, V.s9, V.sd, inkey);
BLAKE_G(x, 0x04, V.s2, V.s6, V.sa, V.se, inkey);
BLAKE_G(x, 0x06, V.s3, V.s7, V.sb, V.sf, inkey);
BLAKE_G(x, 0x08, V.s0, V.s5, V.sa, V.sf, inkey);
BLAKE_G(x, 0x0A, V.s1, V.s6, V.sb, V.sc, inkey);
BLAKE_G(x, 0x0C, V.s2, V.s7, V.s8, V.sd, inkey);
BLAKE_G(x, 0x0E, V.s3, V.s4, V.s9, V.se, inkey);
}
// XOR low part of state with the high part,
// then with the original input block.
tmpblock = V.lo = V.lo ^ V.hi ^ tmpblock;
// Load constants (IV into V.hi)
V.hi = vload8(0U, BLAKE2S_IV_2);
// Compress block, using the input as the key
#ifdef SMALL_BLAKE2S
#pragma unroll BLAKE2S_UNROLL
#else
#pragma unroll 10
#endif
for(int x = 0; x < 10; x++)
{
BLAKE_G(x, 0x00, V.s0, V.s4, V.s8, V.sc, inout);
BLAKE_G(x, 0x02, V.s1, V.s5, V.s9, V.sd, inout);
BLAKE_G(x, 0x04, V.s2, V.s6, V.sa, V.se, inout);
BLAKE_G(x, 0x06, V.s3, V.s7, V.sb, V.sf, inout);
BLAKE_G(x, 0x08, V.s0, V.s5, V.sa, V.sf, inout);
BLAKE_G(x, 0x0A, V.s1, V.s6, V.sb, V.sc, inout);
BLAKE_G(x, 0x0C, V.s2, V.s7, V.s8, V.sd, inout);
BLAKE_G(x, 0x0E, V.s3, V.s4, V.s9, V.se, inout);
}
// Store result in input/output buffer
vstore8(V.lo ^ V.hi ^ tmpblock, 0, inout);
}
/* FastKDF, a fast buffered key derivation function:
* FASTKDF_BUFFER_SIZE must be a power of 2;
* password_len, salt_len and output_len should not exceed FASTKDF_BUFFER_SIZE;
* prf_output_size must be <= prf_key_size; */
void fastkdf(const uchar *restrict password, const uchar *restrict salt, const uint salt_len, uchar *restrict output, uint output_len)
{
/* WARNING!
* This algorithm uses byte-wise addressing for memory blocks.
* Or in other words, trying to copy an unaligned memory region
* will significantly slow down the algorithm, when copying uses
* words or bigger entities. It even may corrupt the data, when
* the device does not support it properly.
* Therefore use byte copying, which will not the fastest but at
* least get reliable results. */
// BLOCK_SIZE 64U
// FASTKDF_BUFFER_SIZE 256U
// BLAKE2S_BLOCK_SIZE 64U
// BLAKE2S_KEY_SIZE 32U
// BLAKE2S_OUT_SIZE 32U
uchar bufidx = 0;
uint8 Abuffer[9], Bbuffer[9] = { (uint8)(0) };
uchar *A = (uchar *)Abuffer, *B = (uchar *)Bbuffer;
uint i;
// Initialize the password buffer
#pragma unroll 5
for( i = 0; i < 5; i++ )
((ulong2 *)A)[i] = ((ulong2 *)A)[i+5] = ((ulong2 *)A)[i+10] = ((ulong2 *)password)[i];
((ulong2 *)A)[15] = ((ulong2 *)password)[0];
((ulong8 *)(A + FASTKDF_BUFFER_SIZE))[0] = ((ulong8 *)password)[0];
// Initialize the salt buffer
if( !(salt_len ^ FASTKDF_BUFFER_SIZE))
{
((ulong16 *)B)[0] = ((ulong16 *)B)[2] = ((ulong16 *)salt)[0];
((ulong16 *)B)[1] = ((ulong16 *)B)[3] = ((ulong16 *)salt)[1];
}
else
{
// salt_len is 80 bytes here
#pragma unroll 5
for( i = 0; i < 5; i++)
((ulong2 *)B)[i] = ((ulong2 *)B)[i+5] = ((ulong2 *)B)[i+10] = ((ulong2 *)salt)[i];
((ulong2 *)B)[15] = ((ulong2 *)salt)[0];
// for(int i = 0; i < (FASTKDF_BUFFER_SIZE >> 3); ++i) ((ulong *)B)[i] = ((ulong *)salt)[i % 10];
// Initialized the rest to zero earlier
((ulong8 *)(B + FASTKDF_BUFFER_SIZE))[0] = ((ulong8 *)salt)[0];
((ulong2 *)(B + FASTKDF_BUFFER_SIZE))[4] = ((ulong2 *)salt)[4];
}
// Make the key buffer twice the size of the key so it fits a Blake2S block
// This way, we don't need a temp buffer in the Blake2S function.
uchar input[BLAKE2S_BLOCK_SIZE], key[BLAKE2S_BLOCK_SIZE] = { 0 };
// The primary iteration
#pragma unroll 1
for(i = 0; i < 32; ++i)
{
// Copy input and key to their buffers
CopyBytes64(input, A + bufidx);
CopyBytes32(key, B + bufidx);
// PRF
Blake2S((uint *)input, (uint *)key);
// Calculate the next buffer pointer
bufidx = 0;
#pragma unroll 2
for(int k = 0; k < 31; k+=16) {
bufidx += input[k] + input[k+1] + input[k+2] + input[k+3] + input[k+4] + input[k+5] + input[k+6] + input[k+7];
bufidx += input[k+8] + input[k+9] + input[k+10] + input[k+11] + input[k+12] + input[k+13] + input[k+14] + input[k+15];
} // Modify the salt buffer
XORBytesInPlace(B + bufidx, input, bufidx );
if( bufidx < BLAKE2S_KEY_SIZE )
{
// Head modified, tail updated
CopyBytes(B + FASTKDF_BUFFER_SIZE + bufidx, B + bufidx, BLAKE2S_KEY_SIZE - bufidx );
}
// else if( (FASTKDF_BUFFER_SIZE - bufidx ) < BLAKE2S_OUT_SIZE )
else if ( bufidx > 224 )
{
// Tail modified, head updated
CopyBytes(B, B + FASTKDF_BUFFER_SIZE, bufidx - 224);
}
}
// Modify and copy into the output buffer
if( (FASTKDF_BUFFER_SIZE - bufidx) < output_len)
{
XORBytes(output, B + bufidx, A, (FASTKDF_BUFFER_SIZE - bufidx));
XORBytes(output + (FASTKDF_BUFFER_SIZE - bufidx), B, A + (FASTKDF_BUFFER_SIZE - bufidx), output_len - (FASTKDF_BUFFER_SIZE - bufidx));
}
else
XORBytes(output, B + bufidx, A, output_len);
}
#define SALSA_CORE(state) do { \
state.s49e3 ^= rotate(state.s05af + state.sc16b, (uint4)( 7U, 7U, 7U, 7U)); \
state.s8d27 ^= rotate(state.s49e3 + state.s05af, (uint4)( 9U, 9U, 9U, 9U)); \
state.sc16b ^= rotate(state.s8d27 + state.s49e3, (uint4)( 13U, 13U, 13U, 13U)); \
state.s05af ^= rotate(state.sc16b + state.s8d27, (uint4)( 18U, 18U, 18U, 18U)); \
\
state.s16bc ^= rotate(state.s05af + state.s349e, (uint4)( 7U, 7U, 7U, 7U)); \
state.s278d ^= rotate(state.s16bc + state.s05af, (uint4)( 9U, 9U, 9U, 9U)); \
state.s349e ^= rotate(state.s278d + state.s16bc, (uint4)( 13U, 13U, 13U, 13U)); \
state.s05af ^= rotate(state.s349e + state.s278d, (uint4)( 18U, 18U, 18U, 18U)); \
} while(0)
uint16 salsa_small_scalar_rnd(uint16 X)
{
uint16 st = X;
#if SALSA_SMALL_UNROLL == 1
for(int i = 0; i < 10; ++i)
{
SALSA_CORE(st);
}
#elif SALSA_SMALL_UNROLL == 2
for(int i = 0; i < 5; ++i)
{
SALSA_CORE(st);
SALSA_CORE(st);
}
#elif SALSA_SMALL_UNROLL == 3
// for(int i = 0; i < 4; ++i)
uint i = 4;
while (i--)
{
SALSA_CORE(st);
if( !i ) break;
SALSA_CORE(st);
SALSA_CORE(st);
}
#elif SALSA_SMALL_UNROLL == 4
for(int i = 0; i < 3; ++i)
{
SALSA_CORE(st);
SALSA_CORE(st);
if(i == 2) break;
SALSA_CORE(st);
SALSA_CORE(st);
}
#else
for(int i = 0; i < 2; ++i)
{
SALSA_CORE(st);
SALSA_CORE(st);
SALSA_CORE(st);
SALSA_CORE(st);
SALSA_CORE(st);
}
#endif
return(X + st);
}
#define CHACHA_CORE_PARALLEL(state) do { \
state[0] += state[1]; state[3] = rotate(state[3] ^ state[0], (uint4)(16U, 16U, 16U, 16U)); \
state[2] += state[3]; state[1] = rotate(state[1] ^ state[2], (uint4)(12U, 12U, 12U, 12U)); \
state[0] += state[1]; state[3] = rotate(state[3] ^ state[0], (uint4)(8U, 8U, 8U, 8U)); \
state[2] += state[3]; state[1] = rotate(state[1] ^ state[2], (uint4)(7U, 7U, 7U, 7U)); \
\
state[0] += state[1].yzwx; state[3].wxyz = rotate(state[3].wxyz ^ state[0], (uint4)(16U, 16U, 16U, 16U)); \
state[2].zwxy += state[3].wxyz; state[1].yzwx = rotate(state[1].yzwx ^ state[2].zwxy, (uint4)(12U, 12U, 12U, 12U)); \
state[0] += state[1].yzwx; state[3].wxyz = rotate(state[3].wxyz ^ state[0], (uint4)(8U, 8U, 8U, 8U)); \
state[2].zwxy += state[3].wxyz; state[1].yzwx = rotate(state[1].yzwx ^ state[2].zwxy, (uint4)(7U, 7U, 7U, 7U)); \
} while(0)
uint16 chacha_small_parallel_rnd(uint16 X)
{
uint4 st[4];
((uint16 *)st)[0] = X;
#if CHACHA_SMALL_UNROLL == 1
for(int i = 0; i < 10; ++i)
{
CHACHA_CORE_PARALLEL(st);
}
#elif CHACHA_SMALL_UNROLL == 2
for(int i = 0; i < 5; ++i)
{
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
}
#elif CHACHA_SMALL_UNROLL == 3
// for(int i = 0; i < 4; ++i)
int i = 4;
while (i--)
{
CHACHA_CORE_PARALLEL(st);
if( !i ) break;
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
}
#elif CHACHA_SMALL_UNROLL == 4
for(int i = 0; i < 3; ++i)
{
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
if(i == 2) break;
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
}
#else
for(int i = 0; i < 2; ++i)
{
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
CHACHA_CORE_PARALLEL(st);
}
#endif
return(X + ((uint16 *)st)[0]);
}
void neoscrypt_blkmix(uint16 *XV, uint alg)
{
uint16 TX;
/* NeoScrypt flow: Scrypt flow:
Xa ^= Xd; M(Xa'); Ya = Xa"; Xa ^= Xb; M(Xa'); Ya = Xa";
Xb ^= Xa"; M(Xb'); Yb = Xb"; Xb ^= Xa"; M(Xb'); Yb = Xb";
Xc ^= Xb"; M(Xc'); Yc = Xc"; Xa" = Ya;
Xd ^= Xc"; M(Xd'); Yd = Xd"; Xb" = Yb;
Xa" = Ya; Xb" = Yc;
Xc" = Yb; Xd" = Yd; */
if (!alg)
{
XV[0] = salsa_small_scalar_rnd( XV[0] ^ XV[3] );
TX = salsa_small_scalar_rnd( XV[1] ^ XV[0] );
XV[1] = salsa_small_scalar_rnd( XV[2] ^ TX );
XV[3] = salsa_small_scalar_rnd( XV[3] ^ XV[1] );
}
else
{
XV[0] = chacha_small_parallel_rnd(XV[0] ^ XV[3] );
TX = chacha_small_parallel_rnd(XV[1] ^ XV[0] );
XV[1] = chacha_small_parallel_rnd(XV[2] ^ TX);
XV[3] = chacha_small_parallel_rnd(XV[3] ^ XV[1] );
}
XV[2] = TX;
}
void SMix(ulong16 *X, __global ulong16 *V, uint flag)
{
uint idx;
uint i = 0;
do {
V[i++] = X[0];
V[i++] = X[1];
neoscrypt_blkmix(X, flag);
} while (i ^ 256);
do {
idx = (((uint *)X)[48])<<1 & 0xFE;
X[0] ^= V[idx++];
X[1] ^= V[idx];
neoscrypt_blkmix(X, flag);
i-=2;
} while (i);
}
__attribute__((reqd_work_group_size(WORKSIZE, 1, 1)))
__kernel void search(__global const uchar* restrict input, __global uint* restrict output, __global uchar *padcache, const uint target)
{
#define CONSTANT_N 128
#define CONSTANT_r 2
// X = CONSTANT_r * 2 * BLOCK_SIZE(64); Z is a copy of X for ChaCha
uint16 X[4], Z[4];
bool flag = false;
/* V = CONSTANT_N * CONSTANT_r * 2 * BLOCK_SIZE */
__global ulong16 *V = (__global ulong16 *)(padcache + ( (get_global_id(0) % MAX_GLOBAL_THREADS) << 15 ));
uchar outbuf[32];
uchar data[PASSWORD_LEN];
((ulong8 *)data)[0] = ((__global const ulong8 *)input)[0];
((ulong *)data)[8] = ((__global const ulong *)input)[8];
((uint *)data)[18] = ((__global const uint *)input)[18];
((uint *)data)[19] = get_global_id(0);
// X = KDF(password, salt)
fastkdf(data, data, PASSWORD_LEN, (uchar *)X, 256);
// Process ChaCha 1st, Salsa 2nd and XOR them - run that through PBKDF2
// CopyBytes128(Z, X, 2);
((ulong16 *)Z)[0] = ((ulong16 *)X)[0];
((ulong16 *)Z)[1] = ((ulong16 *)X)[1];
// X = SMix(X); X & Z are swapped, repeat.
for( ;; ++flag)
{
SMix(X, V, flag);
if (flag) break;
// SwapBytes128(X, Z, 256);
((ulong16 *)X)[0] ^= ((ulong16 *)Z)[0];
((ulong16 *)Z)[0] ^= ((ulong16 *)X)[0];
((ulong16 *)X)[0] ^= ((ulong16 *)Z)[0];
((ulong16 *)X)[1] ^= ((ulong16 *)Z)[1];
((ulong16 *)Z)[1] ^= ((ulong16 *)X)[1];
((ulong16 *)X)[1] ^= ((ulong16 *)Z)[1];
}
// blkxor(X, Z)
((ulong16 *)X)[0] ^= ((ulong16 *)Z)[0];
((ulong16 *)X)[1] ^= ((ulong16 *)Z)[1];
// output = KDF(password, X)
fastkdf(data, (uchar *)X, FASTKDF_BUFFER_SIZE, outbuf, 32);
if(((uint *)outbuf)[7] <= target) output[atomic_add(output + 0xFF, 1)] = get_global_id(0);
}
