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u256

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-07-03 11:31:23 -07:00
parent ff717a9db1
commit e19a7f71aa
3 changed files with 100 additions and 4 deletions
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37
src/math/bigfix/u256.h
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@ -1,17 +1,52 @@
#pragma once
#include "util/util.h"
#include "util/rational.h"
class u256 {
uint64_t m_num[4];
u256(uint64_t const* v);
public:
u256();
u256(uint64_t n);
u256(uint64_t const* v);
u256(rational const& n);
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; }
u256 operator-() const { u256 r = *this; return r.inv(); }
u256 mul_inverse() const;
unsigned trailing_zeros() const;
u256 gcd(u256 const& other) const;
// updates
void reset() { m_num[0] = m_num[1] = m_num[2] = m_num[3] = 0; }
u256& operator+=(u256 const& other);
u256& operator*=(u256 const& other);
u256& operator-=(u256 const& other);
u256& inv(); /* unary minus */
// comparisons
bool operator==(u256 const& other) const;
bool operator!=(u256 const& other) const;
bool operator<(u256 const& other) const;
bool operator<=(u256 const& other) const;
bool operator>(u256 const& other) const;
bool operator>=(u256 const& other) const;
bool operator<(uint64_t other) const;
bool operator<=(uint64_t other) const;
bool operator>(uint64_t other) const;
bool operator>=(uint64_t other) const;
bool is_zero() const { return m_num[0] == 0 && m_num[1] == 0 && m_num[2] == 0 && m_num[3] == 0; }
bool is_one() const { return m_num[0] == 1 && m_num[1] == 0 && m_num[2] == 0 && m_num[3] == 0; }
bool is_even() const { return (m_num[0]&1) == 0; }
std::ostream& display(std::ostream& out) const;
};
inline std::ostream& operator<<(std::ostream& out, u256 const& u) {
return u.display(out);
}