groestl: small optimisation (nist5 + 100kH on a 750Ti)

But, almost nothing on X15, no big changes...

bitslice_transformations_quad.cu

@@ -7,11 +7,13 @@
 #define __shfl(var, srcLane, width) (uint32_t)(var)
 #endif
 
-__device__ __forceinline__ void to_bitslice_quad(uint32_t *input, uint32_t *output)
+__device__ __forceinline__
+void to_bitslice_quad(uint32_t *input, uint32_t *output)
 {
-    int n = threadIdx.x % 4;
     uint32_t other[8];
-#pragma unroll 8
+    const int n = threadIdx.x % 4;
+
+    #pragma unroll
     for (int i = 0; i < 8; i++) {
         input[i] = __shfl((int)input[i], n ^ (3*(n >=1 && n <=2)), 4);
         other[i] = __shfl((int)input[i], (threadIdx.x + 1) % 4, 4);
@@ -56,6 +58,7 @@ __device__ __forceinline__ void to_bitslice_quad(uint32_t *input, uint32_t *outp
     output[ 0] |= ((other[ 6] & 0x00000100) <<21);
     output[ 0] |= ((input[ 7] & 0x00000100) <<22);
     output[ 0] |= ((other[ 7] & 0x00000100) <<23);
+
     output[ 1] |= ((input[ 0] & 0x00000002) >> 1);
     output[ 1] |=  (other[ 0] & 0x00000002);
     output[ 1] |= ((input[ 1] & 0x00000002) << 1);
@@ -88,6 +91,7 @@ __device__ __forceinline__ void to_bitslice_quad(uint32_t *input, uint32_t *outp
     output[ 1] |= ((other[ 6] & 0x00000200) <<20);
     output[ 1] |= ((input[ 7] & 0x00000200) <<21);
     output[ 1] |= ((other[ 7] & 0x00000200) <<22);
+
     output[ 2] |= ((input[ 0] & 0x00000004) >> 2);
     output[ 2] |= ((other[ 0] & 0x00000004) >> 1);
     output[ 2] |=  (input[ 1] & 0x00000004);
@@ -282,7 +286,8 @@ __device__ __forceinline__ void to_bitslice_quad(uint32_t *input, uint32_t *outp
     output[ 7] |= ((other[ 7] & 0x00008000) <<16);
 }
 
-__device__ __forceinline__ void from_bitslice_quad(uint32_t *input, uint32_t *output)
+__device__ __forceinline__
+void from_bitslice_quad(uint32_t *input, uint32_t *output)
 {
 #pragma unroll 8
     for (int i=0; i < 16; i+=2) output[i] = 0;
@@ -421,6 +426,6 @@ __device__ __forceinline__ void from_bitslice_quad(uint32_t *input, uint32_t *ou
         if (threadIdx.x & 1) output[i] = __byte_perm(output[i], 0, 0x1032);
         output[i] = __byte_perm(output[i], __shfl((int)output[i], (threadIdx.x+1)%4, 4), 0x7610);
         output[i+1] = __shfl((int)output[i], (threadIdx.x+2)%4, 4);
-        if ((threadIdx.x % 4) != 0) output[i] = output[i+1] = 0;
+        if (threadIdx.x % 4) output[i] = output[i+1] = 0;
     }
 }

quark/cuda_quark_groestl512.cu

@@ -22,7 +22,7 @@ static cudaDeviceProp props[8];
 #include "bitslice_transformations_quad.cu"
 
 __global__ __launch_bounds__(TPB, THF)
-void quark_groestl512_gpu_hash_64_quad(int threads, uint32_t startNounce, uint32_t *g_hash, uint32_t *g_nonceVector)
+void quark_groestl512_gpu_hash_64_quad(int threads, uint32_t startNounce, uint32_t * __restrict g_hash, uint32_t * __restrict g_nonceVector)
 {
     // durch 4 dividieren, weil jeweils 4 Threads zusammen ein Hash berechnen
     int thread = (blockDim.x * blockIdx.x + threadIdx.x) >> 2;
@@ -32,18 +32,20 @@ void quark_groestl512_gpu_hash_64_quad(int threads, uint32_t startNounce, uint32
         uint32_t message[8];
         uint32_t state[8];
 
-        uint32_t nounce = (g_nonceVector != NULL) ? g_nonceVector[thread] : (startNounce + thread);
-
+        uint32_t nounce = g_nonceVector ? g_nonceVector[thread] : (startNounce + thread);
         int hashPosition = nounce - startNounce;
         uint32_t *inpHash = &g_hash[hashPosition << 4];
 
-#pragma unroll 4
-        for(int k=0;k<4;k++) message[k] = inpHash[(k<<2) + (threadIdx.x&0x03)];
-#pragma unroll 4
+        const uint16_t thr = threadIdx.x % THF;
+
+        #pragma unroll
+        for(int k=0;k<4;k++) message[k] = inpHash[(k * THF) + thr];
+
+        #pragma unroll
         for(int k=4;k<8;k++) message[k] = 0;
 
-        if ((threadIdx.x&0x03) == 0) message[4] = 0x80;
-        if ((threadIdx.x&0x03) == 3) message[7] = 0x01000000;
+        if (thr == 0) message[4] = 0x80;
+        if (thr == 3) message[7] = 0x01000000;
 
         uint32_t msgBitsliced[8];
         to_bitslice_quad(message, msgBitsliced);
@@ -51,13 +53,13 @@ void quark_groestl512_gpu_hash_64_quad(int threads, uint32_t startNounce, uint32
         groestl512_progressMessage_quad(state, msgBitsliced);
 
         // Nur der erste von jeweils 4 Threads bekommt das Ergebns-Hash
-        uint32_t *outpHash = &g_hash[hashPosition<<4];
+        uint32_t *outpHash = inpHash;
         uint32_t hash[16];
         from_bitslice_quad(state, hash);
 
-        if ((threadIdx.x & 0x03) == 0)
+        if (thr == 0)
         {
-#pragma unroll 16
+            #pragma unroll
             for(int k=0;k<16;k++) outpHash[k] = hash[k];
         }
     }
@@ -73,18 +75,20 @@ __global__ void __launch_bounds__(TPB, THF)
         uint32_t message[8];
         uint32_t state[8];
 
-        uint32_t nounce = (g_nonceVector != NULL) ? g_nonceVector[thread] : (startNounce + thread);
+        uint32_t nounce = g_nonceVector ? g_nonceVector[thread] : (startNounce + thread);
 
         int hashPosition = nounce - startNounce;
         uint32_t * inpHash = &g_hash[hashPosition<<4];
+        const uint16_t thr = threadIdx.x % THF;
+
+        #pragma unroll
+        for(int k=0;k<4;k++) message[k] = inpHash[(k * THF) + thr];
 
-#pragma unroll 4
-        for(int k=0;k<4;k++) message[k] = inpHash[(k<<2)+(threadIdx.x&0x03)];
-#pragma unroll 4
+        #pragma unroll
         for(int k=4;k<8;k++) message[k] = 0;
 
-        if ((threadIdx.x&0x03) == 0) message[4] = 0x80;
-        if ((threadIdx.x&0x03) == 3) message[7] = 0x01000000;
+        if (thr == 0) message[4] = 0x80;
+        if (thr == 3) message[7] = 0x01000000;
 
         uint32_t msgBitsliced[8];
         to_bitslice_quad(message, msgBitsliced);
@@ -108,13 +112,13 @@ __global__ void __launch_bounds__(TPB, THF)
         }
 
         // Nur der erste von jeweils 4 Threads bekommt das Ergebns-Hash
-        uint32_t *outpHash = &g_hash[hashPosition<<4];
+        uint32_t *outpHash = inpHash;
         uint32_t hash[16];
         from_bitslice_quad(state, hash);
 
-        if ((threadIdx.x & 0x03) == 0)
+        if (thr == 0)
         {
-#pragma unroll 16
+            #pragma unroll
             for(int k=0;k<16;k++) outpHash[k] = hash[k];
         }
     }