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Use more precise pippenger bucket windows

This commit is contained in:
Jonas Nick 2017-12-06 10:24:00 +00:00
parent 4c950bbeaf
commit d2f9c6b5dc
1 changed files with 41 additions and 41 deletions
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82
src/ecmult_impl.h
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@ -60,9 +60,9 @@
/* Minimum number of points for which pippenger_wnaf is faster than strauss wnaf */
#ifdef USE_ENDOMORPHISM
#define ECMULT_PIPPENGER_THRESHOLD 96
#define ECMULT_PIPPENGER_THRESHOLD 88
#else
#define ECMULT_PIPPENGER_THRESHOLD 156
#define ECMULT_PIPPENGER_THRESHOLD 160
#endif
#ifdef USE_ENDOMORPHISM
@ -716,51 +716,51 @@ static int secp256k1_ecmult_pippenger_wnaf(secp256k1_gej *buckets, int bucket_wi
*/
static int secp256k1_pippenger_bucket_window(size_t n) {
#ifdef USE_ENDOMORPHISM
if (n <= 4) {
if (n <= 1) {
return 1;
} else if (n <= 8) {
} else if (n <= 4) {
return 2;
} else if (n <= 40) {
} else if (n <= 20) {
return 3;
} else if (n <= 117) {
} else if (n <= 57) {
return 4;
} else if (n <= 280) {
} else if (n <= 136) {
return 5;
} else if (n <= 480) {
} else if (n <= 235) {
return 6;
} else if (n <= 2560) {
} else if (n <= 1260) {
return 7;
} else if (n <= 9200) {
} else if (n <= 4420) {
return 9;
} else if (n <= 17400) {
} else if (n <= 7880) {
return 10;
} else if (n <= 28600) {
} else if (n <= 16050) {
return 11;
} else {
return PIPPENGER_MAX_BUCKET_WINDOW;
}
#else
if (n <= 2) {
if (n <= 1) {
return 1;
} else if (n <= 9) {
} else if (n <= 11) {
return 2;
} else if (n <= 42) {
} else if (n <= 45) {
return 3;
} else if (n <= 100) {
return 4;
} else if (n <= 280) {
} else if (n <= 275) {
return 5;
} else if (n <= 610) {
} else if (n <= 625) {
return 6;
} else if (n <= 1920) {
} else if (n <= 1850) {
return 7;
} else if (n <= 3400) {
return 8;
} else if (n <= 10240) {
} else if (n <= 9630) {
return 9;
} else if (n <= 19000) {
} else if (n <= 17900) {
return 10;
} else if (n <= 35000) {
} else if (n <= 32800) {
return 11;
} else {
return PIPPENGER_MAX_BUCKET_WINDOW;
@ -774,30 +774,30 @@ static int secp256k1_pippenger_bucket_window(size_t n) {
static size_t secp256k1_pippenger_bucket_window_inv(int bucket_window) {
switch(bucket_window) {
#ifdef USE_ENDOMORPHISM
case 1: return 4;
case 2: return 8;
case 3: return 40;
case 4: return 117;
case 5: return 280;
case 6: return 480;
case 7: return 2560;
case 8: return 2560;
case 9: return 9200;
case 10: return 17400;
case 11: return 28600;
case 1: return 1;
case 2: return 4;
case 3: return 20;
case 4: return 57;
case 5: return 136;
case 6: return 235;
case 7: return 1260;
case 8: return 1260;
case 9: return 4420;
case 10: return 7880;
case 11: return 16050;
case PIPPENGER_MAX_BUCKET_WINDOW: return SIZE_MAX;
#else
case 1: return 2;
case 2: return 9;
case 3: return 42;
case 1: return 1;
case 2: return 11;
case 3: return 45;
case 4: return 100;
case 5: return 280;
case 6: return 610;
case 7: return 1920;
case 5: return 275;
case 6: return 625;
case 7: return 1850;
case 8: return 3400;
case 9: return 10240;
case 10: return 19000;
case 11: return 35000;
case 9: return 9630;
case 10: return 17900;
case 11: return 32800;
case PIPPENGER_MAX_BUCKET_WINDOW: return SIZE_MAX;
#endif
}