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implemented optional shift in bitvector mantissa

This commit is contained in:
Jiri Pittner 2022-07-08 10:58:30 +02:00
parent bcec9491f7
commit 9c63880efb
1 changed files with 7 additions and 3 deletions
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10
bitvector.h
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@ -95,8 +95,10 @@ for(int i=0; i<n; ++i) if(v[i]) r[i]=1;
//mantissa of a floating number between 0 and 1
template <typename T>
bitvector mantissa(const T &x, int nbits)
bitvector mantissa(T x, int nbits, int shift=0)
{
while(shift >0) {x+=x; --shift;}
while(shift <0) {x*=.5; ++shift;}
if(x<0||x>=1) laerror("number not normalized in bitvector mantissa");
bitvector b(nbits);
b.clear();
@ -111,10 +113,12 @@ return b;
}
template <typename T>
void bitvector_decimal(T &x, const bitvector &b)
void bitvector_decimal(T &x, const bitvector &b, int shift=0)
{
x=0;
for(int i=0; i<b.size(); ++i) if(b[i]) x += 1./(1ULL<<i);
for(int i=b.size()-1; i>=0; --i) if(b[i]) x += 1./(1ULL<<i);
while(shift >0) {x+=x; --shift;}
while(shift <0) {x*=.5; ++shift;}
}