Merge #550: Optimize secp256k1_fe_normalize_weak calls.
9bd89c8
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. (Russell O'Connor)
Pull request description:
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.
Tree-SHA512: 7bbb1aca8e37a268a26d7061bd1f390db129e697792f1d5ddd10ea34927616edc26ef118b500c3e5e14d1d463196033ef64e4d34b765380325c24835458b7a9b
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949e85b009
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@ -277,7 +277,8 @@ static void secp256k1_ecmult_odd_multiples_table_storage_var(const int n, secp25
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if ((n) > 0) { \
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*(r) = (pre)[((n)-1)/2]; \
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} else { \
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secp256k1_ge_neg((r), &(pre)[(-(n)-1)/2]); \
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*(r) = (pre)[(-(n)-1)/2]; \
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secp256k1_fe_negate(&((r)->y), &((r)->y), 1); \
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} \
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} while(0)
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@ -289,7 +290,7 @@ static void secp256k1_ecmult_odd_multiples_table_storage_var(const int n, secp25
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secp256k1_ge_from_storage((r), &(pre)[((n)-1)/2]); \
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} else { \
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secp256k1_ge_from_storage((r), &(pre)[(-(n)-1)/2]); \
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secp256k1_ge_neg((r), (r)); \
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secp256k1_fe_negate(&((r)->y), &((r)->y), 1); \
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} \
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} while(0)
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@ -175,6 +175,8 @@ static void secp256k1_ge_globalz_set_table_gej(size_t len, secp256k1_ge *r, secp
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/* The z of the final point gives us the "global Z" for the table. */
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r[i].x = a[i].x;
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r[i].y = a[i].y;
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/* Ensure all y values are in weak normal form for fast negation of points */
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secp256k1_fe_normalize_weak(&r[i].y);
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*globalz = a[i].z;
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r[i].infinity = 0;
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zs = zr[i];
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