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add u256

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-08-04 10:32:18 -07:00
parent 8a773d2bee
commit 91ac15d716
4 changed files with 26 additions and 3 deletions
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6
src/math/bigfix/u256.cpp
View file

@ -13,6 +13,12 @@ u256::u256(uint64_t n) {
m_num[1] = m_num[2] = m_num[3] = 0;
}
u256::u256(int n) {
SASSERT(n >= 0);
m_num[0] = n;
m_num[1] = m_num[2] = m_num[3] = 0;
}
u256::u256(rational const& n) {
#if 1
for (unsigned i = 0; i < 4; ++i) {

15
src/math/bigfix/u256.h
View file

@ -9,8 +9,13 @@ class u256 {
public:
u256();
u256(uint64_t n);
u256(int n);
u256(rational const& n);
rational to_rational() const;
u256& operator=(uint64_t n) {
*this = u256(n);
return *this;
}
u256 operator*(u256 const& other) const;
u256 operator+(u256 const& other) const { u256 r = *this; return r += other; }
u256 operator-(u256 const& other) const { u256 r = *this; return r -= other; }
@ -43,6 +48,8 @@ public:
bool operator>(u256 const& other) const { return other < *this; }
bool operator>=(u256 const& other) const { return !(*this < other); }
bool operator==(uint64_t other) const { return m_num[0] == other && m_num[1] == 0 && m_num[2] == 0 && m_num[3] == 0; }
bool operator!=(uint64_t other) const { return !(m_num[0] == other && m_num[1] == 0 && m_num[2] == 0 && m_num[3] == 0); }
bool operator<(uint64_t other) const;
bool operator<=(uint64_t other) const { return !(*this > other); }
bool operator>(uint64_t other) const;
@ -63,4 +70,12 @@ inline std::ostream& operator<<(std::ostream& out, u256 const& u) {
inline bool operator<(uint64_t n, u256 const& y) { return y > n; }
inline bool operator<=(uint64_t n, u256 const& y) { return y >= n; }
inline bool operator>(uint64_t n, u256 const& y) { return y < n; }
inline unsigned trailing_zeros(u256 const& n) {
NOT_IMPLEMENTED_YET();
return 0;
}
inline u256 operator-(uint64_t n, u256 const& y) {
u256 x(n);
return x - y;
}
inline bool operator>=(uint64_t n, u256 const& y) { return y <= n; }