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feat(big): add SBigShr

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fallenoak 2023-02-03 14:50:34 -06:00
parent 4a1b6a0f19
commit af0d9ec60e
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5 changed files with 202 additions and 0 deletions
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4
storm/Big.cpp
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@ -49,6 +49,10 @@ void SBigMul(BigData* a, BigData* b, BigData* c) {
Mul(a->Primary(), b->Primary(), c->Primary(), a->Stack());
}
void SBigShr(BigData* a, BigData* b, uint32_t shift) {
Shr(a->Primary(), b->Primary(), shift);
}
void SBigSquare(BigData* a, BigData* b) {
Square(a->Primary(), b->Primary(), a->Stack());
}

2
storm/Big.hpp
View file

@ -20,6 +20,8 @@ void SBigMul(BigData* a, BigData* b, BigData* c);
void SBigNew(BigData** num);
void SBigShr(BigData* a, BigData* b, uint32_t shift);
void SBigSquare(BigData* a, BigData* b);
void SBigSub(BigData* a, BigData* b, BigData* c);

18
storm/big/Ops.cpp
View file

@ -170,6 +170,24 @@ void SetZero(BigBuffer& buffer) {
buffer.Clear();
}
void Shr(BigBuffer& a, const BigBuffer& b, uint32_t shift) {
auto v4 = shift >> 5;
auto v9 = shift & 0x1F;
uint32_t i = 0;
for (i = 0; b.IsUsed(i + v4); i++) {
auto v6 = b[i + v4] >> v9;
if (v9) {
v6 += b[i + v4 + 1] << (32 - v9);
}
a[i] = v6;
}
a.SetCount(i);
}
void Square(BigBuffer& a, const BigBuffer& b, BigStack& stack) {
auto& aa = stack.MakeDistinct(a, &a == &b);
aa.Clear();

2
storm/big/Ops.hpp
View file

@ -37,6 +37,8 @@ void SetOne(BigBuffer& buffer);
void SetZero(BigBuffer& buffer);
void Shr(BigBuffer& a, const BigBuffer& b, uint32_t shift);
void Square(BigBuffer& a, const BigBuffer& b, BigStack& stack);
void Sub(BigBuffer& a, const BigBuffer& b, const BigBuffer& c);