ssateneth
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February 11, 2012, 02:39:59 AM 

So I see the thread title got changed to "seeing improvement" meaining its faster than current phatk2. Could you host the files somewhere so I can plug them into phoenix2 and see how much faster? There are so many code changes in this thread I have no clue what to copy paste, so I'd appreciate it if you had it uploaded somewhere








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d3m0n1q_733rz


February 11, 2012, 05:23:51 AM 

Well, we hope to make it that. But I just rechecked my results since I was working on it in the middle of the night, and it seems it's not that different from the original. Hoping to fix that once I get GOFFSET working properly with VECTORS8. But we keep running into the same register spill problem. Once this is overcome, it should be the fastest kernel available.

Funroll_Loops, the theoretically quicker breakfast cereal! Check out http://www.facebook.com/JupiterICT for all of your computing needs. If you need it, we can get it. We have solutions for your computing conundrums. BTC accepted! 12HWUSguWXRCQKfkPeJygVR1ex5wbg3hAq



rjk


February 11, 2012, 05:25:37 AM 

Once this is overcome, it should be the fastest kernel available.
Until DiabloD3 steps out of his lair with more voodoo magic.




d3m0n1q_733rz


February 11, 2012, 06:24:06 AM 

Actually, I wouldn't mind if DiabloD3 were to help on this project. The more minds, the better the outcome.

Funroll_Loops, the theoretically quicker breakfast cereal! Check out http://www.facebook.com/JupiterICT for all of your computing needs. If you need it, we can get it. We have solutions for your computing conundrums. BTC accepted! 12HWUSguWXRCQKfkPeJygVR1ex5wbg3hAq



niooron


February 11, 2012, 06:51:26 AM 

So this new kernel should be used with 2.6 or 2.1 sdk?

14dxwuQwkQiLbZjJFfciZ26xSGdRU5mKEp



ssateneth
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Activity: 1302


February 11, 2012, 08:00:05 AM 

So this new kernel should be used with 2.6 or 2.1 sdk?
interested in this too. i'd prefer an improvement to my miners using 2.1 sdk.




d3m0n1q_733rz


February 11, 2012, 09:27:04 AM 

So this new kernel should be used with 2.6 or 2.1 sdk?
It's not a new kernel, it's a mod to the existing one. I'm trying to add Vectors8 support and disabling of global offset for increased output for SDK 2.6 while maintaining the functionality for SDK 2.1. This method has already been used with Diapolo's GCN miner and has seen some improvement (with his kernel) on VLIWbased cards. You can see the test I've done with hashing rate in his thread. The problem I'm running into is that Phatk2 seems to have a difficult time handling 8 vectors at once due to memory constraints which effectively cut the number of hashes in half. So, I'm hoping to fix this little problem and introduce the ability to disable global offset in order to maximize output. I also hope to fix the problem of outputting multiple found nonce each round in the case that more than one acceptable share is found while hashing. But I'm going to need people's help with this project. It'll be the people's kernel so to speak. ^_^

Funroll_Loops, the theoretically quicker breakfast cereal! Check out http://www.facebook.com/JupiterICT for all of your computing needs. If you need it, we can get it. We have solutions for your computing conundrums. BTC accepted! 12HWUSguWXRCQKfkPeJygVR1ex5wbg3hAq



d3m0n1q_733rz


February 11, 2012, 01:57:47 PM 

Hey, anyone know how to end an if statement in the middle of a series of statements once a condition has been filled without having to check a variable? Here's an example of what I WANT to work.
if defined VECTORS4 (v.s0==g.s0) ? uint nonce = (W[3].s0); #endif : (); (v.s1==g.s1) ? uint nonce = (W[3].s1); #endif : (); (v.s2==g.s2) ? uint nonce = (W[3].s2); #endif : (); (v.s3==g.s3) ? uint nonce = (W[3].s3); #endif : (); ... #endif
I thought about trying while, but that meant I would be required to use a write to make nonce exist. That's another instruction I didn't need to include. In short, I'm avoiding any writes that are not required and, once nonce is found, end the if statements immediately since no other checks will be useful.
Now, I know the above code doesn't work, but could someone tell me how to write it so that it does? I'll also need to know if the "if (exists(nonce))" statement will work.

Funroll_Loops, the theoretically quicker breakfast cereal! Check out http://www.facebook.com/JupiterICT for all of your computing needs. If you need it, we can get it. We have solutions for your computing conundrums. BTC accepted! 12HWUSguWXRCQKfkPeJygVR1ex5wbg3hAq



bulanula


February 11, 2012, 02:09:56 PM 

So this new kernel should be used with 2.6 or 2.1 sdk?
It's not a new kernel, it's a mod to the existing one. I'm trying to add Vectors8 support and disabling of global offset for increased output for SDK 2.6 while maintaining the functionality for SDK 2.1. This method has already been used with Diapolo's GCN miner and has seen some improvement (with his kernel) on VLIWbased cards. You can see the test I've done with hashing rate in his thread. The problem I'm running into is that Phatk2 seems to have a difficult time handling 8 vectors at once due to memory constraints which effectively cut the number of hashes in half. So, I'm hoping to fix this little problem and introduce the ability to disable global offset in order to maximize output. I also hope to fix the problem of outputting multiple found nonce each round in the case that more than one acceptable share is found while hashing. But I'm going to need people's help with this project. It'll be the people's kernel so to speak. ^_^ Please post a link if you can. I know Diapolo's thread but don't know exactly which page etc. Thanks !




d3m0n1q_733rz


February 11, 2012, 02:30:18 PM 

So this new kernel should be used with 2.6 or 2.1 sdk?
It's not a new kernel, it's a mod to the existing one. I'm trying to add Vectors8 support and disabling of global offset for increased output for SDK 2.6 while maintaining the functionality for SDK 2.1. This method has already been used with Diapolo's GCN miner and has seen some improvement (with his kernel) on VLIWbased cards. You can see the test I've done with hashing rate in his thread. The problem I'm running into is that Phatk2 seems to have a difficult time handling 8 vectors at once due to memory constraints which effectively cut the number of hashes in half. So, I'm hoping to fix this little problem and introduce the ability to disable global offset in order to maximize output. I also hope to fix the problem of outputting multiple found nonce each round in the case that more than one acceptable share is found while hashing. But I'm going to need people's help with this project. It'll be the people's kernel so to speak. ^_^ Please post a link if you can. I know Diapolo's thread but don't know exactly which page etc. Thanks ! https://bitcointalk.org/index.php?topic=61406.20DiakGCN results on ATI HD5450 VECTORS4 WORKSIZE=128 with GOFFSET=false 14.45 Mhash/s VECTORS4 WORKSIZE=128 without GOFFSET=false 14.46 Mhash/s VECTORS8 WORKSIZE=128 with GOFFSET=false 14.46 Mhash/s VECTORS8 WORKSIZE=128 without GOFFSET=false 14.47 Mhash/s VECTORS4 WORKSIZE=64 with GOFFSET=false 14.49 Mhash/s VECTORS4 WORKSIZE=64 without GOFFSET=false 14.50 Mhash/s VECTORS8 WORKSIZE=64 with GOFFSET=false 14.55 Mhash/s VECTORS8 WORKSIZE=64 without GOFFSET=false 14.50 Mhash/s VECTORS4 WORKSIZE=32 with GOFFSET=false 14.46 Mhash/s VECTORS4 WORKSIZE=32 without GOFFSET=false 14.47 Mhash/s VECTORS8 WORKSIZE=32 with GOFFSET=false 14.50 Mhash/s VECTORS8 WORKSIZE=32 without GOFFSET=false 14.48 Mhash/s

Funroll_Loops, the theoretically quicker breakfast cereal! Check out http://www.facebook.com/JupiterICT for all of your computing needs. If you need it, we can get it. We have solutions for your computing conundrums. BTC accepted! 12HWUSguWXRCQKfkPeJygVR1ex5wbg3hAq



d3m0n1q_733rz


February 11, 2012, 04:02:18 PM 

Very slightly faster for my GPU. This had some tweaking done in the order of addition of P1 and P3. The result is increase in GPRs, but a decent drop in cycles/ALUs. Also, an increase in hashing speed! // This file is in the public domain
#ifdef VECTORS8 typedef uint8 u; #elif defined VECTORS4 typedef uint4 u; #elif defined VECTORS typedef uint2 u; #else typedef uint u; #endif
__constant uint K[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
__constant uint ConstW[128] = { 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x80000000U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000280U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x80000000U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000100U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000 };
__constant uint H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
#ifdef BITALIGN #pragma OPENCL EXTENSION cl_amd_media_ops : enable #define rot(x, y) amd_bitalign(x, x, (uint)(32  y)) #else #define rot(x, y) rotate(x, (uint)y) #endif
// Some AMD devices have the BFI_INT opcode, which behaves exactly like the // SHA256 Ch function, but provides it in exactly one instruction. If // detected, use it for Ch. Otherwise, use bitselect() for Ch.
#ifdef BFI_INT // Well, slight problem... It turns out BFI_INT isn't actually exposed to // OpenCL (or CAL IL for that matter) in any way. However, there is // a similar instruction, BYTE_ALIGN_INT, which is exposed to OpenCL via // amd_bytealign, takes the same inputs, and provides the same output. // We can use that as a placeholder for BFI_INT and have the application // patch it after compilation.
// This is the BFI_INT function #define Ch(x, y, z) amd_bytealign(x,y,z) // Ma can also be implemented in terms of BFI_INT... #define Ma(z, x, y) amd_bytealign(z^x,y,x) #else #define Ch(x, y, z) bitselect(z,y,x) #define Ma(x, y, z) bitselect(x,y,(z^x)) #endif
//Various intermediate calculations for each SHA round #define s0(n) (S0(Vals[(0 + 128  (n)) % 8])) #define S0(n) (rot(n, 30u)^rot(n, 19u)^rot(n,10u))
#define s1(n) (S1(Vals[(4 + 128  (n)) % 8])) #define S1(n) (rot(n, 26u)^rot(n, 21u)^rot(n, 7u))
#define ch(n) Ch(Vals[(4 + 128  (n)) % 8],Vals[(5 + 128  (n)) % 8],Vals[(6 + 128  (n)) % 8]) #define maj(n) Ma(Vals[(1 + 128  (n)) % 8],Vals[(2 + 128  (n)) % 8],Vals[(0 + 128  (n)) % 8])
//t1 calc when W is already calculated #define t1(n) K[(n) % 64] + Vals[(7 + 128  (n)) % 8] + W[(n)] + s1(n) + ch(n)
//t1 calc which calculates W #define t1W(n) K[(n) % 64] + Vals[(7 + 128  (n)) % 8] + W(n) + s1(n) + ch(n)
//Used for constant W Values (the compiler optimizes out zeros) #define t1C(n) (K[(n) % 64]+ ConstW[(n)]) + Vals[(7 + 128  (n)) % 8] + s1(n) + ch(n)
//t2 Calc #define t2(n) maj(n) + s0(n)
#define rotC(x,n) (x<<n  x >> (32n))
//W calculation used for SHA round #define W(n) (W[n] = P4(n) + P3(n) + P2(n) + P1(n))
//Partial W calculations (used for the begining where only some values are nonzero) #define P1(n) ((rot(W[(n)2],15u)^rot(W[(n)2],13u)^((W[(n)2])>>10U))) #define P2(n) ((rot(W[(n)15],25u)^rot(W[(n)15],14u)^((W[(n)15])>>3U))) #define p1(x) ((rot(x,15u)^rot(x,13u)^((x)>>10U))) #define p2(x) ((rot(x,25u)^rot(x,14u)^((x)>>3U))) #define P3(n) W[n7] #define P4(n) W[n16]
//Partial Calcs for constant W values #define P1C(n) ((rotC(ConstW[(n)2],15)^rotC(ConstW[(n)2],13)^((ConstW[(n)2])>>10U))) #define P2C(n) ((rotC(ConstW[(n)15],25)^rotC(ConstW[(n)15],14)^((ConstW[(n)15])>>3U))) #define P3C(x) ConstW[x7] #define P4C(x) ConstW[x16]
//SHA round with built in W calc #define sharoundW(n) Barrier1(n); Vals[(3 + 128  (n)) % 8] += t1W(n); Vals[(7 + 128  (n)) % 8] = t1W(n) + t2(n);
//SHA round without W calc #define sharound(n) Barrier2(n); Vals[(3 + 128  (n)) % 8] += t1(n); Vals[(7 + 128  (n)) % 8] = t1(n) + t2(n);
//SHA round for constant W values #define sharoundC(n) Barrier2(n); Vals[(3 + 128  (n)) % 8] += t1C(n); Vals[(7 + 128  (n)) % 8] = t1C(n) + t2(n);
//The compiler is stupid... I put this in there only to stop the compiler from (de)optimizing the order #define Barrier1(n) t1 = t1C((n+1)) #define Barrier2(n) t1 = t1C((n))
__kernel //removed this to allow detection of invalid work size //__attribute__((reqd_work_group_size(WORKSIZE, 1, 1))) void search( const uint state0, const uint state1, const uint state2, const uint state3, const uint state4, const uint state5, const uint state6, const uint state7, const uint B1, const uint C1, const uint D1, const uint F1, const uint G1, const uint H1, #ifndef GOFFSET const u base, #endif const uint W16, const uint W17, const uint PreVal4, const uint PreVal0, const uint PreW31, const uint PreW32, const uint PreW19, const uint PreW20, __global uint * output) {
u W[124]; u Vals[8];
//Dummy Variable to prevent compiler from reordering between rounds u t1;
W[16] = W16; W[17] = W17;
#ifdef VECTORS8 #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 3) + (u)(0, 1, 2, 3, 4, 5, 6, 7); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + (uint)(get_local_id(0)) * 8u + (uint)(get_group_id(0)) * (WORKSIZE * 8u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); //Since only the 2 LSB is opposite between the nonces, we can save an instruction by flipping the 4 bits in W18 rather than the 1 bit in W3 W[18] = PreW20 + (u){r, r ^ 0x2004000U, r ^ 0x4008000U, r ^ 0x600C000U, r ^ 0x8010000U, r ^ 0xA050000U, r ^ 0xC090000U, r ^ 0xE0D0000U}; #endif
#elif defined VECTORS4 #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 2) + (u)(0, 1, 2, 3); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else
//Less dependencies to get both the local id and group id and then add them W[3] = base + (uint)(get_local_id(0)) * 4u + (uint)(get_group_id(0)) * (WORKSIZE * 4u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); //Since only the 2 LSB is opposite between the nonces, we can save an instruction by flipping the 4 bits in W18 rather than the 1 bit in W3 W[18] = PreW20 + (u){r, r ^ 0x2004000U, r ^ 0x4008000U, r ^ 0x600C000U}; #endif #elif defined VECTORS #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 1) + (u)(0, 1,); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + (uint)(get_local_id(0)) * 2u + (uint)(get_group_id(0)) * (WORKSIZE * 2u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); W[18] = PreW20 + (u){r, r ^ 0x2004000U}; #endif #else #ifdef GOFFSET W[3] = ((uint)get_global_id(0)); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + get_local_id(0) + get_group_id(0) * (WORKSIZE); u r = rot(W[3],25u)^rot(W[3],14u)^((W[3])>>3U); W[18] = PreW20 + r; #endif #endif //the order of the W calcs and Rounds is like this because the compiler needs help finding how to order the instructions
//Vals[0]=state0; Vals[0] = PreVal0 + W[3]; Vals[1]=B1; Vals[2]=C1; Vals[3]=D1; //Vals[4]=PreVal4; Vals[4] = PreVal4 + W[3]; Vals[5]=F1; Vals[6]=G1; Vals[7]=H1;
sharoundC(4); W[19] = PreW19 + W[3]; sharoundC(5); W[20] = P4C(20) + P1(20); sharoundC(6); W[21] = P1(21); sharoundC(7); W[22] = P3C(22) + P1(22); sharoundC(8); W[23] = W[16] + P1(23); sharoundC(9); W[24] = W[17] + P1(24); sharoundC(10); W[25] = P3(25) + P1(25); W[26] = P3(26) + P1(26); sharoundC(11); W[27] = P3(27) + P1(27); W[28] = P3(28) + P1(28); sharoundC(12); W[29] = P3(29) + P1(29); sharoundC(13); W[30] = P3(30) + P2C(30) + P1(30); W[31] = PreW31 + (P3(31) + P1(31)); sharoundC(14); W[32] = PreW32 + (P3(32) + P1(32)); sharoundC(15); sharound(16); sharound(17); sharound(18); sharound(19); sharound(20); sharound(21); sharound(22); sharound(23); sharound(24); sharound(25); sharound(26); sharound(27); sharound(28); sharound(29); sharound(30); sharound(31); sharound(32); sharoundW(33); sharoundW(34); sharoundW(35); sharoundW(36); sharoundW(37); sharoundW(38); sharoundW(39); sharoundW(40); sharoundW(41); sharoundW(42); sharoundW(43); sharoundW(44); sharoundW(45); sharoundW(46); sharoundW(47); sharoundW(48); sharoundW(49); sharoundW(50); sharoundW(51); sharoundW(52); sharoundW(53); sharoundW(54); sharoundW(55); sharoundW(56); sharoundW(57); sharoundW(58); sharoundW(59); sharoundW(60); sharoundW(61); sharoundW(62); sharoundW(63);
W[64]=state0+Vals[0]; W[65]=state1+Vals[1]; W[66]=state2+Vals[2]; W[67]=state3+Vals[3]; W[68]=state4+Vals[4]; W[69]=state5+Vals[5]; W[70]=state6+Vals[6]; W[71]=state7+Vals[7];
const u Temp = (0xb0edbdd0U + K[0]) + W[64]; Vals[0]=H[0]; Vals[1]=H[1]; Vals[2]=H[2]; Vals[3]=0xa54ff53aU + Temp; Vals[4]=H[4]; Vals[5]=H[5]; Vals[6]=H[6]; Vals[7]=0x08909ae5U + Temp;
#define P124(n) P2(n) + P1(n) + P4(n)
W[80] = P2(80) + P4(80); sharound(65); W[81] = P1C(81) + P2(81) + P4(81); sharound(66); W[82] = P124(82); sharound(67); W[83] = P124(83); sharound(68); W[84] = P124(84); sharound(69); W[85] = P124(85); sharound(70); W[86] = P4(86) + P3C(86) + P2(86) + P1(86); sharound(71); W[87] = P4(87) + P3(87) + P2C(87) + P1(87); sharoundC(72); W[88] = P1(88) + P4C(88) + P3(88); sharoundC(73); W[89] = P3(89) + P1(89); sharoundC(74); W[90] = P3(90) + P1(90); sharoundC(75); W[91] = P3(91) + P1(91); sharoundC(76); W[92] = P3(92) + P1(92); sharoundC(77); W[93] = P3(93) + P1(93); W[94] = P3(94) + P2C(94) + P1(94); sharoundC(78); W[95] = P4C(95) + P3(95) + P2(95) + P1(95); sharoundC(79); sharound(80); sharound(81); sharound(82); sharound(83); sharound(84); sharound(85); sharound(86); sharound(87); sharound(88); sharound(89); sharound(90); sharound(91); sharound(92); sharound(93); sharound(94); sharound(95); sharoundW(96); sharoundW(97); sharoundW(98); sharoundW(99); sharoundW(100); sharoundW(101); sharoundW(102); sharoundW(103); sharoundW(104); sharoundW(105); sharoundW(106); sharoundW(107); sharoundW(108); sharoundW(109); sharoundW(110); sharoundW(111); sharoundW(112); sharoundW(113); sharoundW(114); sharoundW(115); sharoundW(116); sharoundW(117); sharoundW(118); sharoundW(119); sharoundW(120); sharoundW(121); sharoundW(122);
u v = W[117] + W[108] + Vals[3] + Vals[7] + P2(124) + P1(124) + Ch((Vals[0] + Vals[4]) + (K[59] + W(123)) + s1(123)+ ch(123),Vals[1],Vals[2]); u g = (K[60] + H[7])  S1((Vals[0] + Vals[4]) + (K[59] + W(123)) + s1(123)+ ch(123));
// uint nonce = 0; #ifdef VECTORS8 uint nonce = (v.s0==g.s0) ? W[3].s0 : 0; nonce = (v.s1==g.s1) ? W[3].s1 : nonce; nonce = (v.s2==g.s2) ? W[3].s2 : nonce; nonce = (v.s3==g.s3) ? W[3].s3 : nonce; nonce = (v.s4==g.s4) ? W[3].s4 : nonce; nonce = (v.s5==g.s5) ? W[3].s5 : nonce; nonce = (v.s6==g.s6) ? W[3].s6 : nonce; nonce = (v.s7==g.s7) ? W[3].s7 : nonce; #elif defined VECTORS4 uint nonce = (v.s0==g.s0) ? W[3].s0 : 0; nonce = (v.s1==g.s1) ? W[3].s1 : nonce; nonce = (v.s2==g.s2) ? W[3].s2 : nonce; nonce = (v.s3==g.s3) ? W[3].s3 : nonce; #elif defined VECTORS uint nonce = (v.s0==g.s0) ? W[3].s0 : 0; nonce = (v.s1==g.s1) ? W[3].s1 : nonce; #else uint nonce = (v==g) ? W[3] : 0 #endif if(nonce!=0) { //Faster to shift the nonce by 2 due to 4DWORD addressing and does not add more collisions output[WORKSIZE] = nonce; output[get_local_id(0)] = nonce; } }

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TimPrice
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February 11, 2012, 07:18:18 PM 

May I ask you d3m0n1q_733rz, what do you do for a living? I just know a little of NASM and CISCA and this post seems so fancy already, it intrigued me into try to help, but I can't understand almost anything

I miss BlackBox



d3m0n1q_733rz


February 12, 2012, 05:54:45 AM 

May I ask you d3m0n1q_733rz, what do you do for a living? I just know a little of NASM and CISCA and this post seems so fancy already, it intrigued me into try to help, but I can't understand almost anything I'm presently disabled. And I started programming in assembly as well. I have a degree in Network Systems Administration and I would like to find something along those lines in work, but so far not able to do so. OpenCL isn't TOO difficult to learn, but I have trouble with the syntax of some commands like prefetch and the like. I'm thinking about tossing a prefetch or two into the code to see if it'll increase the speed by much. In particular, just before sharoundC to prepare K and ConstW if it's not already. And then another prefetch to call the parts of H when it's needed for Vals. I don't know if this could shave off a few cycles or not, but I plan to find out.

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gat3way


February 12, 2012, 10:22:54 AM 

prefetch is a noop on GPUs. It is useful in CPU kernels only to prefetch data in CPU cache (same as what _mm_prefetch() does). if defined VECTORS4 (v.s0==g.s0) ? uint nonce = (W[3].s0); #endif : (); (v.s1==g.s1) ? uint nonce = (W[3].s1); #endif : (); (v.s2==g.s2) ? uint nonce = (W[3].s2); #endif : (); (v.s3==g.s3) ? uint nonce = (W[3].s3); #endif : (); ... #endif
This is also not possible, it's an illegal construction that would fail the compilation. (v.s0==g.s0) is evaluated at runtime and the results are unknown to the preprocessor. If you need to terminate execution before write, you can just do that: if (!nonce) return; I am not sure it would make much of a difference though.




d3m0n1q_733rz


February 12, 2012, 10:40:35 AM 

prefetch is a noop on GPUs. It is useful in CPU kernels only to prefetch data in CPU cache (same as what _mm_prefetch() does). if defined VECTORS4 (v.s0==g.s0) ? uint nonce = (W[3].s0); #endif : (); (v.s1==g.s1) ? uint nonce = (W[3].s1); #endif : (); (v.s2==g.s2) ? uint nonce = (W[3].s2); #endif : (); (v.s3==g.s3) ? uint nonce = (W[3].s3); #endif : (); ... #endif
This is also not possible, it's an illegal construction that would fail the compilation. (v.s0==g.s0) is evaluated at runtime and the results are unknown to the preprocessor. If you need to terminate execution before write, you can just do that: if (!nonce) return; I am not sure it would make much of a difference though. I knew this was an illegal instruction and even said this in the exact same post you quoted from. I posted the above statement to ask if there was any way to accomplish the above task legally. So, it seems that a series of if statements may be the only legal way to accomplish it. I want it to check if v.s0==g.s0 and, if so, uint nonce = (W[3].s0) then stop checking the series of if statements as none of the rest will do anything but add unnecessary cycles. If not, do nothing and continue to the next if statement. At the end, if (exists(nonce)) {output...}. I would daisychain some if statements together if I thought they would work. if defined VECTORS4 (v.s0==g.s0) ? uint nonce = (W[3].s0), #return : (v.s1==g.s1) ? uint nonce = (W[3].s1), #return : (v.s2==g.s2) ? uint nonce = (W[3].s2), #return : (v.s3==g.s3) ? uint nonce = (W[3].s3) : (); ... #endif But I need to figure out how to accomplish the above without having to put [uint nonce =] at the beginning of it. So, again, what will work? Just a bunch of branched if statements in a row?

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gat3way


February 12, 2012, 01:32:10 PM 

No, you can't do that with predication.




d3m0n1q_733rz


February 12, 2012, 01:49:34 PM 

No, you can't do that with predication.
"I would daisychain some if statements together if I thought they would work." Stated. So, again, what CAN we do to accomplish the same thing as what I was attempting to convey? Perhaps replacing the () with Null? But how do I get it to return after setting the nonce to a W[3] value? THAT'S the problem I'm trying to solve. I suppose a series of #elif statements would do it. If none are satisfied, then no nonce would be written. Then, I just check for an existing one and the rest is finished. Now, what I COULD do is skip nonce all together and output the nonce directly to the miner. This way, we don't have to worry about any more instructions, statements or variables. We get to the result as quickly as possible and cut all the crap in between. This solves the problem of multiple nonce being wasted and cycles being lost. Anyone for this approach instead? Again, inspired by Diapolo code.

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gat3way


February 12, 2012, 10:27:03 PM 

Nothing. Earlier termination would cost you more than going through all the checks. You cannot use preprocessor directives for that because v and g are not known in compile time, so forget about #ifdef's, #else's, #define's and so on. I've seen such confusion from people that have been coding in interpreted languages mostly and recently switched to C. Anyway. If I were to search for improvements in the kernel (assuming I changed vector width to , perhaps the final checks is not the right place. If you have a look at the kernel, you'd notice that a lot of code has been "reordered" so that higher ALUPacking is achieved. For example sometimes several w[X] values are calculated in a row, sometimes it is done with each SHA256 round step. Another thing is order of operations in the macros, it is not random, I bet whoever coded it has profiled ALUPacking and chosen the best case. However, switching to uint8 would definitely break that. I believe you can get at least 12% performance improvement from tighter alupacking which is much more than what you'd get from saving several ALU ops in the final checks




d3m0n1q_733rz


February 12, 2012, 10:39:37 PM 

Nothing. Earlier termination would cost you more than going through all the checks. You cannot use preprocessor directives for that because v and g are not known in compile time, so forget about #ifdef's, #else's, #define's and so on. I've seen such confusion from people that have been coding in interpreted languages mostly and recently switched to C. Anyway. If I were to search for improvements in the kernel (assuming I changed vector width to , perhaps the final checks is not the right place. If you have a look at the kernel, you'd notice that a lot of code has been "reordered" so that higher ALUPacking is achieved. For example sometimes several w[X] values are calculated in a row, sometimes it is done with each SHA256 round step. Another thing is order of operations in the macros, it is not random, I bet whoever coded it has profiled ALUPacking and chosen the best case. However, switching to uint8 would definitely break that. I believe you can get at least 12% performance improvement from tighter alupacking which is much more than what you'd get from saving several ALU ops in the final checks I already accomplished this partially by changing around the P#(n) values as my most recent change. I shaved off around 10 cycles. But yeah, starting from the bottom and working my way up. The best way seems to be to directly export the nonce to the miner without using the uint nonce. This way, we don't worry about having more than one or checking redundant hashes at the end. Once this problem is solved, I'll work on the bigger fish.

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d3m0n1q_733rz


February 13, 2012, 12:24:26 PM 

// This file is in the public domain
#ifdef VECTORS8 typedef uint8 u; #elif defined VECTORS4 typedef uint4 u; #elif defined VECTORS typedef uint2 u; #else typedef uint u; #endif
__constant uint K[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
__constant uint ConstW[128] = { 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x80000000U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000280U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x80000000U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000100U, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000 };
__constant uint H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
#ifdef BITALIGN #pragma OPENCL EXTENSION cl_amd_media_ops : enable #define rot(x, y) amd_bitalign(x, x, (uint)(32  y)) #else #define rot(x, y) rotate(x, (uint)y) #endif
// Some AMD devices have the BFI_INT opcode, which behaves exactly like the // SHA256 Ch function, but provides it in exactly one instruction. If // detected, use it for Ch. Otherwise, use bitselect() for Ch.
#ifdef BFI_INT // Well, slight problem... It turns out BFI_INT isn't actually exposed to // OpenCL (or CAL IL for that matter) in any way. However, there is // a similar instruction, BYTE_ALIGN_INT, which is exposed to OpenCL via // amd_bytealign, takes the same inputs, and provides the same output. // We can use that as a placeholder for BFI_INT and have the application // patch it after compilation.
// This is the BFI_INT function #define Ch(x, y, z) amd_bytealign(x,y,z) // Ma can also be implemented in terms of BFI_INT... #define Ma(z, x, y) amd_bytealign(z^x,y,x) #else #define Ch(x, y, z) bitselect(z,y,x) #define Ma(x, y, z) bitselect(x,y,(z^x)) #endif
//Various intermediate calculations for each SHA round #define s0(n) (S0(Vals[(0 + 128  (n)) % 8])) #define S0(n) (rot(n, 30u)^rot(n, 19u)^rot(n,10u))
#define s1(n) (S1(Vals[(4 + 128  (n)) % 8])) #define S1(n) (rot(n, 26u)^rot(n, 21u)^rot(n, 7u))
#define ch(n) Ch(Vals[(4 + 128  (n)) % 8],Vals[(5 + 128  (n)) % 8],Vals[(6 + 128  (n)) % 8]) #define maj(n) Ma(Vals[(1 + 128  (n)) % 8],Vals[(2 + 128  (n)) % 8],Vals[(0 + 128  (n)) % 8])
//t1 calc when W is already calculated #define t1(n) K[(n) % 64] + Vals[(7 + 128  (n)) % 8] + W[(n)] + s1(n) + ch(n)
//t1 calc which calculates W #define t1W(n) K[(n) % 64] + Vals[(7 + 128  (n)) % 8] + W(n) + s1(n) + ch(n)
//Used for constant W Values (the compiler optimizes out zeros) #define t1C(n) (K[(n) % 64]+ ConstW[(n)]) + Vals[(7 + 128  (n)) % 8] + s1(n) + ch(n)
//t2 Calc #define t2(n) maj(n) + s0(n)
#define rotC(x,n) (x<<n  x >> (32n))
//W calculation used for SHA round #define W(n) (W[n] = P4(n) + P3(n) + P2(n) + P1(n))
//Partial W calculations (used for the begining where only some values are nonzero) #define P1(n) ((rot(W[(n)2],15u)^rot(W[(n)2],13u)^((W[(n)2])>>10U))) #define P2(n) ((rot(W[(n)15],25u)^rot(W[(n)15],14u)^((W[(n)15])>>3U))) #define p1(x) ((rot(x,15u)^rot(x,13u)^((x)>>10U))) #define p2(x) ((rot(x,25u)^rot(x,14u)^((x)>>3U))) #define P3(n) W[n7] #define P4(n) W[n16]
//Partial Calcs for constant W values #define P1C(n) ((rotC(ConstW[(n)2],15)^rotC(ConstW[(n)2],13)^((ConstW[(n)2])>>10U))) #define P2C(n) ((rotC(ConstW[(n)15],25)^rotC(ConstW[(n)15],14)^((ConstW[(n)15])>>3U))) #define P3C(x) ConstW[x7] #define P4C(x) ConstW[x16]
//SHA round with built in W calc #define sharoundW(n) Barrier1(n); Vals[(3 + 128  (n)) % 8] += t1W(n); Vals[(7 + 128  (n)) % 8] = t1W(n) + t2(n);
//SHA round without W calc #define sharound(n) Barrier2(n); Vals[(3 + 128  (n)) % 8] += t1(n); Vals[(7 + 128  (n)) % 8] = t1(n) + t2(n);
//SHA round for constant W values #define sharoundC(n) Barrier2(n); Vals[(3 + 128  (n)) % 8] += t1C(n); Vals[(7 + 128  (n)) % 8] = t1C(n) + t2(n);
//The compiler is stupid... I put this in there only to stop the compiler from (de)optimizing the order #define Barrier1(n) t1 = t1C((n+1)) #define Barrier2(n) t1 = t1C((n))
__kernel //removed this to allow detection of invalid work size //__attribute__((reqd_work_group_size(WORKSIZE, 1, 1))) void search( const uint state0, const uint state1, const uint state2, const uint state3, const uint state4, const uint state5, const uint state6, const uint state7, const uint B1, const uint C1, const uint D1, const uint F1, const uint G1, const uint H1, #ifndef GOFFSET const u base, #endif const uint W16, const uint W17, const uint PreVal4, const uint PreVal0, const uint PreW31, const uint PreW32, const uint PreW19, const uint PreW20, __global uint * output) {
u W[124]; u Vals[8];
//Dummy Variable to prevent compiler from reordering between rounds u t1;
W[16] = W16; W[17] = W17;
#ifdef VECTORS8 #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 3) + (u)(0, 1, 2, 3, 4, 5, 6, 7); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + (uint)(get_local_id(0)) * 8u + (uint)(get_group_id(0)) * (WORKSIZE * 8u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); //Since only the 2 LSB is opposite between the nonces, we can save an instruction by flipping the 4 bits in W18 rather than the 1 bit in W3 W[18] = PreW20 + (u){r, r ^ 0x2004000U, r ^ 0x4008000U, r ^ 0x600C000U, r ^ 0x8010000U, r ^ 0xA050000U, r ^ 0xC090000U, r ^ 0xE0D0000U}; #endif
#elif defined VECTORS4 #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 2) + (u)(0, 1, 2, 3); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else
//Less dependencies to get both the local id and group id and then add them W[3] = base + (uint)(get_local_id(0)) * 4u + (uint)(get_group_id(0)) * (WORKSIZE * 4u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); //Since only the 2 LSB is opposite between the nonces, we can save an instruction by flipping the 4 bits in W18 rather than the 1 bit in W3 W[18] = PreW20 + (u){r, r ^ 0x2004000U, r ^ 0x4008000U, r ^ 0x600C000U}; #endif #elif defined VECTORS #ifdef GOFFSET W[3] = ((uint)get_global_id(0) << 1) + (u)(0, 1,); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + (uint)(get_local_id(0)) * 2u + (uint)(get_group_id(0)) * (WORKSIZE * 2u); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); W[18] = PreW20 + (u){r, r ^ 0x2004000U}; #endif #else #ifdef GOFFSET W[3] = ((uint)get_global_id(0)); uint r = rot(W[3].s0,25u)^rot(W[3].s0,14u)^((W[3].s0)>>3U); #else W[3] = base + get_local_id(0) + get_group_id(0) * (WORKSIZE); u r = rot(W[3],25u)^rot(W[3],14u)^((W[3])>>3U); W[18] = PreW20 + r; #endif #endif //the order of the W calcs and Rounds is like this because the compiler needs help finding how to order the instructions
//Vals[0]=state0; Vals[0] = PreVal0 + W[3]; Vals[1]=B1; Vals[2]=C1; Vals[3]=D1; //Vals[4]=PreVal4; Vals[4] = PreVal4 + W[3]; Vals[5]=F1; Vals[6]=G1; Vals[7]=H1;
sharoundC(4); W[19] = PreW19 + W[3]; sharoundC(5); W[20] = P4C(20) + P1(20); sharoundC(6); W[21] = P1(21); sharoundC(7); W[22] = P3C(22) + P1(22); sharoundC(8); W[23] = W[16] + P1(23); sharoundC(9); W[24] = W[17] + P1(24); sharoundC(10); W[25] = P3(25) + P1(25); W[26] = P3(26) + P1(26); sharoundC(11); W[27] = P3(27) + P1(27); W[28] = P3(28) + P1(28); sharoundC(12); W[29] = P3(29) + P1(29); sharoundC(13); W[30] = P3(30) + P2C(30) + P1(30); W[31] = PreW31 + (P3(31) + P1(31)); sharoundC(14); W[32] = PreW32 + (P3(32) + P1(32)); sharoundC(15); sharound(16); sharound(17); sharound(18); sharound(19); sharound(20); sharound(21); sharound(22); sharound(23); sharound(24); sharound(25); sharound(26); sharound(27); sharound(28); sharound(29); sharound(30); sharound(31); sharound(32); sharoundW(33); sharoundW(34); sharoundW(35); sharoundW(36); sharoundW(37); sharoundW(38); sharoundW(39); sharoundW(40); sharoundW(41); sharoundW(42); sharoundW(43); sharoundW(44); sharoundW(45); sharoundW(46); sharoundW(47); sharoundW(48); sharoundW(49); sharoundW(50); sharoundW(51); sharoundW(52); sharoundW(53); sharoundW(54); sharoundW(55); sharoundW(56); sharoundW(57); sharoundW(58); sharoundW(59); sharoundW(60); sharoundW(61); sharoundW(62); sharoundW(63);
W[64]=state0+Vals[0]; W[65]=state1+Vals[1]; W[66]=state2+Vals[2]; W[67]=state3+Vals[3]; W[68]=state4+Vals[4]; W[69]=state5+Vals[5]; W[70]=state6+Vals[6]; W[71]=state7+Vals[7];
const u Temp = (0xb0edbdd0U + K[0]) + W[64]; Vals[0]=H[0]; Vals[1]=H[1]; Vals[2]=H[2]; Vals[3]=0xa54ff53aU + Temp; Vals[4]=H[4]; Vals[5]=H[5]; Vals[6]=H[6]; Vals[7]=0x08909ae5U + Temp;
#define P124(n) P2(n) + P1(n) + P4(n)
W[80] = P2(80) + P4(80); sharound(65); W[81] = P1C(81) + P2(81) + P4(81); sharound(66); W[82] = P124(82); sharound(67); W[83] = P124(83); sharound(68); W[84] = P124(84); sharound(69); W[85] = P124(85); sharound(70); W[86] = P4(86) + P3C(86) + P2(86) + P1(86); sharound(71); W[87] = P4(87) + P3(87) + P2C(87) + P1(87); sharoundC(72); W[88] = P1(88) + P4C(88) + P3(88); sharoundC(73); W[89] = P3(89) + P1(89); sharoundC(74); W[90] = P3(90) + P1(90); sharoundC(75); W[91] = P3(91) + P1(91); sharoundC(76); W[92] = P3(92) + P1(92); sharoundC(77); W[93] = P3(93) + P1(93); W[94] = P3(94) + P2C(94) + P1(94); sharoundC(78); W[95] = P4C(95) + P3(95) + P2(95) + P1(95); sharoundC(79); sharound(80); sharound(81); sharound(82); sharound(83); sharound(84); sharound(85); sharound(86); sharound(87); sharound(88); sharound(89); sharound(90); sharound(91); sharound(92); sharound(93); sharound(94); sharound(95); sharoundW(96); sharoundW(97); sharoundW(98); sharoundW(99); sharoundW(100); sharoundW(101); sharoundW(102); sharoundW(103); sharoundW(104); sharoundW(105); sharoundW(106); sharoundW(107); sharoundW(108); sharoundW(109); sharoundW(110); sharoundW(111); sharoundW(112); sharoundW(113); sharoundW(114); sharoundW(115); sharoundW(116); sharoundW(117); sharoundW(118); sharoundW(119); sharoundW(120); sharoundW(121); sharoundW(122);
u v = W[117] + W[108] + Vals[3] + Vals[7] + P2(124) + P1(124) + Ch((Vals[0] + Vals[4]) + (K[59] + W(123)) + s1(123)+ ch(123),Vals[1],Vals[2]); u g = (K[60] + H[7])  S1((Vals[0] + Vals[4]) + (K[59] + W(123)) + s1(123)+ ch(123));
// uint nonce = 0; #ifdef VECTORS8 if (v.s0==g.s0) { output[WORKSIZE] = W[3].s0; output[get_local_id(0)] = W[3].s0; } if (v.s1==g.s1) { output[WORKSIZE] = W[3].s1; output[get_local_id(0)] = W[3].s1; } if (v.s2==g.s2) { output[WORKSIZE] = W[3].s2; output[get_local_id(0)] = W[3].s2; } if (v.s3==g.s3) { output[WORKSIZE] = W[3].s3; output[get_local_id(0)] = W[3].s3; } if (v.s4==g.s4) { output[WORKSIZE] = W[3].s4; output[get_local_id(0)] = W[3].s4; } if (v.s5==g.s5) { output[WORKSIZE] = W[3].s5; output[get_local_id(0)] = W[3].s5; } if (v.s6==g.s6) { output[WORKSIZE] = W[3].s6; output[get_local_id(0)] = W[3].s6; } if (v.s7==g.s7) { output[WORKSIZE] = W[3].s7; output[get_local_id(0)] = W[3].s7; } #elif defined VECTORS4 if (v.s0==g.s0) { output[WORKSIZE] = W[3].s0; output[get_local_id(0)] = W[3].s0; } if (v.s1==g.s1) { output[WORKSIZE] = W[3].s1; output[get_local_id(0)] = W[3].s1; } if (v.s2==g.s2) { output[WORKSIZE] = W[3].s2; output[get_local_id(0)] = W[3].s2; } if (v.s3==g.s3) { output[WORKSIZE] = W[3].s3; output[get_local_id(0)] = W[3].s3; }
#elif defined VECTORS if (v.s0==g.s0) { output[WORKSIZE] = W[3].s0; output[get_local_id(0)] = W[3].s0; } if (v.s1==g.s1) { output[WORKSIZE] = W[3].s1; output[get_local_id(0)] = W[3].s1; } #else if (v==g) { output[WORKSIZE] = W[3]; output[get_local_id(0)] = W[3]; } #endif } Here's the most recent changed phatk2 kernel. I've decided to directly output any found valid hashes instead of having it write to and then read from nonce. It works and it should give more accepted hashes (in theory) without dropping any and having the overhead of another variable.

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