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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
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lib/gmp_big_rational.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
gmp_big_rational.cpp
Abstract:
Big rationals using GMP
Author:
Leonardo de Moura (leonardo) 2006-09-26.
Revision History:
--*/
#include<limits.h>
#include"gmp_big_rational.h"
#include"trace.h"
#include"buffer.h"
#ifndef NO_GMP
mpz_t big_rational::m_tmp;
bool big_rational::m_tmp_initialized = false;
mpz_t big_rational::m_int_min;
mpz_t big_rational::m_int_max;
mpz_t big_rational::m_uint_max;
mpz_t big_rational::m_two32;
mpz_t big_rational::m_int64_min;
mpz_t big_rational::m_int64_max;
mpz_t big_rational::m_uint64_max;
bool big_rational::m_has_limits = false;
void big_rational::init_limits() {
mpz_init(m_int_min);
mpz_init(m_int_max);
mpz_init(m_uint_max);
mpz_init(m_two32);
mpz_init(m_int64_min);
mpz_init(m_int64_max);
mpz_init(m_uint64_max);
mpz_set_si(m_int_min, INT_MIN);
mpz_set_si(m_int_max, INT_MAX);
mpz_set_ui(m_uint_max, UINT_MAX);
mpz_set_ui(m_two32, UINT_MAX);
mpz_t & tmp = get_tmp();
mpz_set_si(tmp, 1);
mpz_add(m_two32, m_two32, tmp);
unsigned max_l = static_cast<unsigned>(INT64_MAX % static_cast<int64>(UINT_MAX));
unsigned max_h = static_cast<unsigned>(INT64_MAX / static_cast<int64>(UINT_MAX));
mpz_set_ui(m_int64_max, max_h);
mpz_mul(m_int64_max, m_uint_max, m_int64_max);
mpz_set_ui(tmp, max_l);
mpz_add(m_int64_max, tmp, m_int64_max);
mpz_neg(m_int64_min, m_int64_max);
mpz_set_si(tmp, -1);
mpz_add(m_int64_min, m_int64_min, tmp);
mpz_set(m_uint64_max, m_int64_max);
mpz_set_si(tmp, 2);
mpz_mul(m_uint64_max, m_uint64_max, tmp);
mpz_set_si(tmp, 1);
mpz_add(m_uint64_max, m_uint64_max, tmp);
m_has_limits = true;
}
std::string big_rational::to_string() const {
size_t sz = mpz_sizeinbase(mpq_numref(m_data), 10) + mpz_sizeinbase(mpq_numref(m_data), 10) + 3;
buffer<char> b(sz, 0);
mpq_get_str(b.c_ptr(), 10, m_data);
std::string result(b.c_ptr());
return result;
}
int64 big_rational::get_int64() const {
if (!m_has_limits) {
init_limits();
}
SASSERT(is_int64());
mpz_t & tmp = get_tmp();
mpq_get_num(tmp, m_data);
if (sizeof(int64) == sizeof(long) || mpz_fits_slong_p(tmp)) {
return mpz_get_si(tmp);
}
else {
mpz_mod(tmp, tmp, two32());
int64 r = static_cast<int64>(mpz_get_ui(tmp));
mpq_get_num(tmp, m_data);
mpz_div(tmp, tmp, two32());
r += static_cast<int64>(mpz_get_si(tmp)) << static_cast<int64>(32);
return r;
}
}
uint64 big_rational::get_uint64() const {
if (!m_has_limits) {
init_limits();
}
SASSERT(is_uint64());
mpz_t & tmp = get_tmp();
mpq_get_num(tmp, m_data);
if (sizeof(uint64) == sizeof(unsigned long) || mpz_fits_ulong_p(tmp)) {
return mpz_get_ui(tmp);
}
else {
mpz_mod(tmp, tmp, two32());
uint64 r = static_cast<uint64>(mpz_get_ui(tmp));
mpq_get_num(tmp, m_data);
mpz_div(tmp, tmp, two32());
r += static_cast<uint64>(mpz_get_ui(tmp)) << static_cast<uint64>(32);
return r;
}
}
#endif