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more scaffolding

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This commit is contained in:
Nikolaj Bjorner 2021-03-21 11:31:14 -07:00
parent a1f484fa35
commit 2fef6dc502
16 changed files with 476 additions and 152 deletions
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27
src/util/mpz.cpp
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@ -2469,6 +2469,33 @@ bool mpz_manager<SYNCH>::decompose(mpz const & a, svector<digit_t> & digits) {
}
}
template<bool SYNCH>
bool mpz_manager<SYNCH>::get_bit(mpz const & a, unsigned index) {
if (is_small(a)) {
SASSERT(a.m_val >= 0);
if (index >= 8*sizeof(digit_t))
return false;
return 0 != (a.m_val & (1ull << (digit_t)index));
}
unsigned i = index / (sizeof(digit_t)*8);
unsigned o = index % (sizeof(digit_t)*8);
#ifndef _MP_GMP
mpz_cell * cell_a = a.m_ptr;
unsigned sz = cell_a->m_size;
if (sz*sizeof(digit_t)*8 <= index)
return false;
return 0 != (cell_a->m_digits[i] & (1ull << (digit_t)o));
#else
SASSERT(!is_neg(a));
svector<digit_t> digits;
decompose(a, digits);
if (digits.size()*sizeof(digit_t)*8 <= index)
return false;
return 0 != (digits[i] & (1ull << (digit_t)o));
#endif
}
template<bool SYNCH>
bool mpz_manager<SYNCH>::divides(mpz const & a, mpz const & b) {
_scoped_numeral<mpz_manager<SYNCH> > tmp(*this);