lbry: small sha512 improvement

lbry/cuda_sha512_lbry.cu

@@ -40,12 +40,21 @@ uint64_t K_512[80] = {
 #undef xor3
 #define xor3(a,b,c) (a^b^c)
 
+//#define ROR64_8(x) ROTR64(x,8)
+__device__ __inline__
+uint64_t ROR64_8(const uint64_t u64) {
+	const uint2 a = vectorize(u64);
+	uint2 result;
+	result.x = __byte_perm(a.y, a.x, 0x0765);
+	result.y = __byte_perm(a.y, a.x, 0x4321);
+	return devectorize(result);
+}
+
 #define bsg5_0(x) xor3(ROTR64(x,28),ROTR64(x,34),ROTR64(x,39))
 #define bsg5_1(x) xor3(ROTR64(x,14),ROTR64(x,18),ROTR64(x,41))
-#define ssg5_0(x) xor3(ROTR64(x,1),ROTR64(x,8),x>>7)
+#define ssg5_0(x) xor3(ROTR64(x,1), ROR64_8(x), x>>7)
 #define ssg5_1(x) xor3(ROTR64(x,19),ROTR64(x,61), x>>6)
 
-
 #define andor64(a,b,c) ((a & (b | c)) | (b & c))
 #define xandx64(e,f,g) (g ^ (e & (g ^ f)))
 
@@ -67,6 +76,7 @@ void lbry_sha512_gpu_hash_32(const uint32_t threads, uint64_t *g_hash)
 		0x6A09E667F3BCC908, 0xBB67AE8584CAA73B, 0x3C6EF372FE94F82B, 0xA54FF53A5F1D36F1,
 		0x510E527FADE682D1, 0x9B05688C2B3E6C1F, 0x1F83D9ABFB41BD6B, 0x5BE0CD19137E2179
 	};
+
 	uint64_t r[8];
 	uint64_t W[16];
 	if (thread < threads)
@@ -76,7 +86,7 @@ void lbry_sha512_gpu_hash_32(const uint32_t threads, uint64_t *g_hash)
 		*(uint2x4*)&r[0] = *(uint2x4*)&IV512[0];
 		*(uint2x4*)&r[4] = *(uint2x4*)&IV512[4];
 
-		*(uint2x4*)&W[ 0] = __ldg4((uint2x4*)&pHash[ 0]);
+		*(uint2x4*)&W[0] = __ldg4((uint2x4*)pHash);
 
 		W[4] = 0x8000000000000000; // end tag