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Set a true 256bit binary target based on any diff value in set_target()

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Con Kolivas 2013-11-01 23:08:49 +11:00
parent 61297399de
commit 8d61ee2455
1 changed files with 39 additions and 10 deletions
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49
cgminer.c
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@ -5912,23 +5912,52 @@ static void gen_hash(unsigned char *data, unsigned char *hash, int len)
sha256(hash1, 32, hash); sha256(hash1, 32, hash);
} }
/* truediffone == 0x00000000FFFF0000000000000000000000000000000000000000000000000000
* Generate a 256 bit binary LE target by cutting up diff into 64 bit sized
* portions. */
static double truediffone = 26959535291011309493156476344723991336010898738574164086137773096960.0;
static double bits192 = 6277101735386680763835789423207666416102355444464034512896.0;
static double bits128 = 340282366920938463463374607431768211456.0;
static double bits64 = 18446744073709551616.0;
void set_target(unsigned char *dest_target, double diff) void set_target(unsigned char *dest_target, double diff)
{ {
unsigned char target[32], rtarget[32]; unsigned char target[32];
uint64_t *data64, h64; uint64_t *data64, h64;
double d64; double d64, dcut64;
d64 = truediffone;
if (opt_scrypt) if (opt_scrypt)
d64 = 0xFFFF00000000ull; d64 *= (double)65536;
else
d64 = 0xFFFF0000ull;
d64 /= diff; d64 /= diff;
h64 = d64;
memset(rtarget, 0xFF, 32); dcut64 = d64 / bits192;
data64 = (uint64_t *)rtarget; h64 = dcut64;
*data64 = htobe64(h64); data64 = (uint64_t *)(target + 24);
swab256(target, rtarget); *data64 = htole64(h64);
dcut64 = h64;
dcut64 *= bits192;
d64 -= dcut64;
dcut64 = d64 / bits128;
h64 = dcut64;
data64 = (uint64_t *)(target + 16);
*data64 = htole64(h64);
dcut64 = h64;
dcut64 *= bits128;
d64 -= dcut64;
dcut64 = d64 / bits64;
h64 = dcut64;
data64 = (uint64_t *)(target + 8);
*data64 = htole64(h64);
dcut64 = h64;
dcut64 *= bits64;
d64 -= dcut64;
h64 = d64;
data64 = (uint64_t *)(target);
*data64 = htole64(h64);
if (opt_debug) { if (opt_debug) {
char *htarget = bin2hex(target, 32); char *htarget = bin2hex(target, 32);