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Calculate diff from target accurately for all 256 bits.

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This commit is contained in:
Con Kolivas 2013-11-01 23:30:29 +11:00
parent 8d61ee2455
commit 8abe9d4e39
1 changed files with 34 additions and 34 deletions
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68
cgminer.c
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@ -1755,7 +1755,7 @@ void free_work(struct work *work)
} }
static void gen_hash(unsigned char *data, unsigned char *hash, int len); static void gen_hash(unsigned char *data, unsigned char *hash, int len);
static void calc_diff(struct work *work, int known); static void calc_diff(struct work *work, double known);
char *workpadding = "000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000"; char *workpadding = "000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000";
#ifdef HAVE_LIBCURL #ifdef HAVE_LIBCURL
@ -3067,40 +3067,46 @@ out:
return pool; return pool;
} }
static double DIFFEXACTONE = 26959946667150639794667015087019630673637144422540572481103610249215.0; /* truediffone == 0x00000000FFFF0000000000000000000000000000000000000000000000000000
static const uint64_t diffone = 0xFFFF000000000000ull; * Generate a 256 bit binary LE target by cutting up diff into 64 bit sized
* portions or vice versa. */
static const double truediffone = 26959535291011309493156476344723991336010898738574164086137773096960.0;
static const double bits192 = 6277101735386680763835789423207666416102355444464034512896.0;
static const double bits128 = 340282366920938463463374607431768211456.0;
static const double bits64 = 18446744073709551616.0;
/* /*
* Calculate the work share difficulty * Calculate the work->work_difficulty based on the work->target
*/ */
static void calc_diff(struct work *work, int known) static void calc_diff(struct work *work, double known)
{ {
struct cgminer_pool_stats *pool_stats = &(work->pool->cgminer_pool_stats); struct cgminer_pool_stats *pool_stats = &(work->pool->cgminer_pool_stats);
double difficulty; double difficulty;
int intdiff; int intdiff;
if (opt_scrypt) { if (known)
uint64_t *data64, d64;
char rtarget[32];
swab256(rtarget, work->target);
data64 = (uint64_t *)(rtarget + 2);
d64 = be64toh(*data64);
if (unlikely(!d64))
d64 = 1;
work->work_difficulty = diffone / d64;
} else if (!known) {
double targ = 0;
int i;
for (i = 31; i >= 0; i--) {
targ *= 256;
targ += work->target[i];
}
work->work_difficulty = DIFFEXACTONE / (targ ? : DIFFEXACTONE);
} else
work->work_difficulty = known; work->work_difficulty = known;
else {
double d64, dcut64;
uint64_t *data64;
d64 = truediffone;
if (opt_scrypt)
d64 *= (double)65536;
data64 = (uint64_t *)(work->target + 24);
dcut64 = le64toh(*data64);
data64 = (uint64_t *)(work->target + 16);
dcut64 += le64toh(*data64) * bits64;
data64 = (uint64_t *)(work->target + 8);
dcut64 += le64toh(*data64) * bits128;
data64 = (uint64_t *)(work->target);
dcut64 += le64toh(*data64) * bits192;
work->work_difficulty = d64 / dcut64;
}
difficulty = work->work_difficulty; difficulty = work->work_difficulty;
pool_stats->last_diff = difficulty; pool_stats->last_diff = difficulty;
@ -3710,6 +3716,8 @@ static bool stale_work(struct work *work, bool share)
return false; return false;
} }
static const uint64_t diffone = 0xFFFF000000000000ull;
static uint64_t share_diff(const struct work *work) static uint64_t share_diff(const struct work *work)
{ {
uint64_t *data64, d64, ret; uint64_t *data64, d64, ret;
@ -5912,14 +5920,6 @@ 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]; unsigned char target[32];