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Optimize secp256k1_fe_normalize_weak calls. 

Move secp256k1_fe_normalize_weak calls out of ECMULT_TABLE_GET_GE and ECMULT_TABLE_GET_GE_STORAGE and into secp256k1_ge_globalz_set_table_gej instead.
This commit is contained in:
Russell O'Connor 2018-08-12 23:47:38 -04:00
parent 1e6f1f5ad5
commit 9bd89c836b
2 changed files with 5 additions and 2 deletions
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5
src/ecmult_impl.h
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@ -166,7 +166,8 @@ static void secp256k1_ecmult_odd_multiples_table_storage_var(int n, secp256k1_ge
if ((n) > 0) { \ if ((n) > 0) { \
*(r) = (pre)[((n)-1)/2]; \ *(r) = (pre)[((n)-1)/2]; \
} else { \ } else { \
secp256k1_ge_neg((r), &(pre)[(-(n)-1)/2]); \ *(r) = (pre)[(-(n)-1)/2]; \
secp256k1_fe_negate(&((r)->y), &((r)->y), 1); \
} \ } \
} while(0) } while(0)
@ -178,7 +179,7 @@ static void secp256k1_ecmult_odd_multiples_table_storage_var(int n, secp256k1_ge
secp256k1_ge_from_storage((r), &(pre)[((n)-1)/2]); \ secp256k1_ge_from_storage((r), &(pre)[((n)-1)/2]); \
} else { \ } else { \
secp256k1_ge_from_storage((r), &(pre)[(-(n)-1)/2]); \ secp256k1_ge_from_storage((r), &(pre)[(-(n)-1)/2]); \
secp256k1_ge_neg((r), (r)); \ secp256k1_fe_negate(&((r)->y), &((r)->y), 1); \
} \ } \
} while(0) } while(0)

2
src/group_impl.h
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@ -178,6 +178,8 @@ static void secp256k1_ge_globalz_set_table_gej(size_t len, secp256k1_ge *r, secp
/* The z of the final point gives us the "global Z" for the table. */ /* The z of the final point gives us the "global Z" for the table. */
r[i].x = a[i].x; r[i].x = a[i].x;
r[i].y = a[i].y; r[i].y = a[i].y;
/* Ensure all y values are in weak normal form for fast negation of points */
secp256k1_fe_normalize_weak(&r[i].y);
*globalz = a[i].z; *globalz = a[i].z;
r[i].infinity = 0; r[i].infinity = 0;
zs = zr[i]; zs = zr[i];