diff options
Diffstat (limited to 'bignum.c')
| -rw-r--r-- | bignum.c | 20 |
1 files changed, 6 insertions, 14 deletions
@@ -1593,8 +1593,8 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zl, BDIGIT *xds, size_t xl, BDIGIT *yds, size_t n; int sub_p, borrow, carry1, carry2, carry3; - int odd_x = 0; int odd_y = 0; + int odd_xy = 0; BDIGIT *xds0, *xds1, *yds0, *yds1, *zds0, *zds1, *zds2, *zds3; @@ -1606,7 +1606,7 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zl, BDIGIT *xds, size_t xl, BDIGIT *yds, odd_y = 1; yl--; if (yl < xl) { - odd_x = 1; + odd_xy = 1; xl--; } } @@ -1706,15 +1706,10 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zl, BDIGIT *xds, size_t xl, BDIGIT *yds, if (carry2) bary_add_one(zds2, zl-2*n); - if (borrow && carry1) - borrow = carry1 = 0; - if (borrow && carry3) - borrow = carry3 = 0; - - if (borrow) + if (carry1 + carry3 - borrow < 0) bary_sub_one(zds3, zl-3*n); - else if (carry1 || carry3) { - BDIGIT c = carry1 + carry3; + else if (carry1 + carry3 - borrow > 0) { + BDIGIT c = carry1 + carry3 - borrow; bary_add(zds3, zl-3*n, zds3, zl-3*n, &c, 1); } @@ -1729,13 +1724,10 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zl, BDIGIT *xds, size_t xl, BDIGIT *yds, } */ - if (odd_x && odd_y) { + if (odd_xy) { bary_muladd_1xN(zds+yl, zl-yl, yds[yl], xds, xl); bary_muladd_1xN(zds+xl, zl-xl, xds[xl], yds, yl+1); } - else if (odd_x) { - bary_muladd_1xN(zds+xl, zl-xl, xds[xl], yds, yl); - } else if (odd_y) { bary_muladd_1xN(zds+yl, zl-yl, yds[yl], xds, xl); } |