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cxxrtl: add $divfloor.

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Charlotte 2023-06-28 11:47:30 +10:00 • committed by Catherine
parent 911a76affa
commit eb397592f0
2 changed files with 20 additions and 1 deletions
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19
backends/cxxrtl/cxxrtl.h
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@ -1595,6 +1595,25 @@ value<BitsY> modfloor_ss(const value<BitsA> &a, const value<BitsB> &b) {
return r;
}
template<size_t BitsY, size_t BitsA, size_t BitsB>
CXXRTL_ALWAYS_INLINE
value<BitsY> divfloor_uu(const value<BitsA> &a, const value<BitsB> &b) {
return divmod_uu<BitsY>(a, b).first;
}
// Divfloor. Similar to above: returns q=a//b, where q has the sign of a*b and a=b*q+N.
// In other words, returns (truncating) a/b, except if a and b have different signs
// and there's non-zero remainder, subtract one more towards floor.
template<size_t BitsY, size_t BitsA, size_t BitsB>
CXXRTL_ALWAYS_INLINE
value<BitsY> divfloor_ss(const value<BitsA> &a, const value<BitsB> &b) {
value<BitsY> q, r;
std::tie(q, r) = divmod_ss<BitsY>(a, b);
if ((b.is_neg() != a.is_neg()) && !r.is_zero())
return sub_uu<BitsY>(q, value<1> { 1u });
return q;
}
// Memory helper
struct memory_index {