diff options
Diffstat (limited to 'src/lib/utils/donna128.h')
| -rw-r--r-- | src/lib/utils/donna128.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/lib/utils/donna128.h b/src/lib/utils/donna128.h index c2a3e0d2e..2a2d1e339 100644 --- a/src/lib/utils/donna128.h +++ b/src/lib/utils/donna128.h @@ -23,18 +23,24 @@ class donna128 friend donna128 operator>>(const donna128& x, size_t shift) { donna128 z = x; - const u64bit carry = z.h << (64 - shift); - z.h = (z.h >> shift); - z.l = (z.l >> shift) | carry; + if(shift > 0) + { + const u64bit carry = z.h << (64 - shift); + z.h = (z.h >> shift); + z.l = (z.l >> shift) | carry; + } return z; } friend donna128 operator<<(const donna128& x, size_t shift) { donna128 z = x; - const u64bit carry = z.l >> (64 - shift); - z.l = (z.l << shift); - z.h = (z.h << shift) | carry; + if(shift > 0) + { + const u64bit carry = z.l >> (64 - shift); + z.l = (z.l << shift); + z.h = (z.h << shift) | carry; + } return z; } |