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remove unused calculations from mod_reduce.

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Signed-off-by: Anthony Romano <anthony.romano@coreos.com>
This commit is contained in:
Anthony Romano
2017-07-16 19:40:49 -07:00
committed by NIIBE Yutaka
parent a51ac8593b
commit 2622840e27
4 changed files with 12 additions and 4 deletions
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5
src/mod.c
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@@ -36,7 +36,6 @@ mod_reduce (bn256 *X, const bn512 *A, const bn256 *B, const bn256 *MU_lower)
bn512 q_big[1], tmp[1];
uint32_t carry;
#define borrow carry
uint32_t borrow_next;
memset (q, 0, sizeof (bn256));
q->word[0] = A->word[15];
@@ -110,9 +109,7 @@ mod_reduce (bn256 *X, const bn512 *A, const bn256 *B, const bn256 *MU_lower)
= tmp->word[11] = tmp->word[10] = tmp->word[9] = 0;
borrow = bn256_sub (X, (bn256 *)&q_big->word[0], (bn256 *)&tmp->word[0]);
borrow_next = (q_big->word[8] < borrow);
q_big->word[8] -= borrow;
borrow_next += (q_big->word[8] < tmp->word[8]);
q_big->word[8] -= tmp->word[8];
carry = q_big->word[8];
@@ -122,7 +119,7 @@ mod_reduce (bn256 *X, const bn512 *A, const bn256 *B, const bn256 *MU_lower)
bn256_sub (q, X, B);
if (carry)
carry -= bn256_sub (X, X, B);
bn256_sub (X, X, B);
else
bn256_sub (q, X, B);