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feat(big) add SBigIsEven

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Adam Heinermann 2024-11-15 08:27:03 -08:00 • committed by superp00t
parent 328bbf61d8
commit 6759cb4d7c
5 changed files with 34 additions and 0 deletions
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4
storm/Big.cpp
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@ -69,6 +69,10 @@ void SBigInc(BigData* a, BigData* b) {
Add(a->Primary(), b->Primary(), 1);
}
int32_t SBigIsEven(BigData* a) {
return IsEven(a->Primary());
}
void SBigMod(BigData* a, BigData* b, BigData* c) {
uint32_t allocCount = 0;
auto& scratch = a->Stack().Alloc(&allocCount);

2
storm/Big.hpp
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@ -28,6 +28,8 @@ void SBigFromUnsigned(BigData* num, uint32_t val);
void SBigInc(BigData* a, BigData* b);
int32_t SBigIsEven(BigData* a);
void SBigMod(BigData* a, BigData* b, BigData* c);
void SBigMul(BigData* a, BigData* b, BigData* c);

4
storm/big/Ops.cpp
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@ -211,6 +211,10 @@ void InsertLowPart(uint64_t& value, uint32_t low) {
value = (value << 32) | low;
}
int32_t IsEven(const BigBuffer &num) {
return num.Count() == 0 || (num[0] & 1) == 0;
}
uint64_t MakeLarge(uint32_t low, uint32_t high) {
return low + (static_cast<uint64_t>(high) << 32);
}

2
storm/big/Ops.hpp
View file

@ -33,6 +33,8 @@ uint32_t HighBitPos(const BigBuffer& buffer);
void InsertLowPart(uint64_t& value, uint32_t low);
int32_t IsEven(const BigBuffer &num);
uint64_t MakeLarge(uint32_t low, uint32_t high);
void Mul(BigBuffer& a, const BigBuffer& b, uint64_t c);