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feat(big): add Div

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fallenoak 2023-02-01 23:27:32 -06:00
parent 24c6a5134c
commit 4d3651134c
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3 changed files with 133 additions and 0 deletions
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17
storm/big/Ops.cpp
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@ -34,6 +34,23 @@ int32_t Compare(const BigBuffer& a, const BigBuffer& b) {
return result;
}
void Div(BigBuffer& a, uint32_t* b, const BigBuffer& c, uint64_t d) {
// TODO STORM_ASSERT(d <= SMALL_BOUND);
auto index = c.Count();
a.SetCount(index);
uint64_t data = 0;
while (index > 0) {
InsertLowPart(data, c[--index]);
a[index] = data / d;
data %= d;
}
a.Trim();
*b = data;
}
uint32_t ExtractLowPart(uint64_t& value) {
auto low = static_cast<uint32_t>(value);
value >>= 32;

2
storm/big/Ops.hpp
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@ -11,6 +11,8 @@ void Add(BigBuffer& a, const BigBuffer& b, const BigBuffer& c);
int32_t Compare(const BigBuffer& a, const BigBuffer& b);
void Div(BigBuffer& a, uint32_t* b, const BigBuffer& c, uint64_t d);
uint32_t ExtractLowPart(uint64_t& value);
uint32_t ExtractLowPartSx(uint64_t& value);