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scanhash micro-optimizations

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* don't bother returning nonce, we only need success/fail boolean
* don't needlessly read nonce pointer data, for each loop
This commit is contained in:
Jeff Garzik 2010-11-25 01:27:19 -05:00 committed by Jeff Garzik
parent 1032fec15b
commit e4c4b3fe5f
1 changed files with 9 additions and 11 deletions
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16
cpu-miner.c
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@ -334,16 +334,15 @@ static const uint32_t init_state[8] = {
}; };
/* suspiciously similar to ScanHash* from bitcoin */ /* suspiciously similar to ScanHash* from bitcoin */
static uint32_t scanhash(unsigned char *midstate, unsigned char *data, static bool scanhash(unsigned char *midstate, unsigned char *data,
unsigned char *hash1, unsigned char *hash) unsigned char *hash1, unsigned char *hash)
{ {
uint32_t *hash32 = (uint32_t *) hash; uint32_t *hash32 = (uint32_t *) hash;
uint32_t *nonce = (uint32_t *)(data + 12); uint32_t *nonce = (uint32_t *)(data + 12);
uint32_t n; uint32_t n = 0;
unsigned long stat_ctr = 0; unsigned long stat_ctr = 0;
while (1) { while (1) {
n = *nonce;
n++; n++;
*nonce = n; *nonce = n;
@ -359,7 +358,7 @@ static uint32_t scanhash(unsigned char *midstate, unsigned char *data,
hexstr); hexstr);
free(hexstr); free(hexstr);
return n; return true;
} }
stat_ctr++; stat_ctr++;
@ -373,7 +372,7 @@ static uint32_t scanhash(unsigned char *midstate, unsigned char *data,
if (opt_debug) if (opt_debug)
fprintf(stderr, "DBG: end of nonce range\n"); fprintf(stderr, "DBG: end of nonce range\n");
return 0; return false;
} }
} }
} }
@ -426,9 +425,8 @@ static void *miner_thread(void *dummy)
"{\"method\": \"getwork\", \"params\": [], \"id\":0}\r\n"; "{\"method\": \"getwork\", \"params\": [], \"id\":0}\r\n";
while (1) { while (1) {
json_t *val;
struct work work __attribute__((aligned(128))); struct work work __attribute__((aligned(128)));
uint32_t nonce; json_t *val;
bool rc; bool rc;
/* obtain new work from bitcoin */ /* obtain new work from bitcoin */
@ -448,11 +446,11 @@ static void *miner_thread(void *dummy)
json_decref(val); json_decref(val);
/* scan nonces for a proof-of-work hash */ /* scan nonces for a proof-of-work hash */
nonce = scanhash(work.midstate, work.data + 64, rc = scanhash(work.midstate, work.data + 64,
work.hash1, work.hash); work.hash1, work.hash);
/* if nonce found, submit work */ /* if nonce found, submit work */
if (nonce) if (rc)
submit_work(&work); submit_work(&work);
} }