Skip to content

Instantly share code, notes, and snippets.

@JarkkoPFC

JarkkoPFC/bitonic_sort64.h

Last active December 3, 2024 22:23
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save JarkkoPFC/dcae77af8ee29b7f7b80e2d79d9563e4 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save JarkkoPFC/dcae77af8ee29b7f7b80e2d79d9563e4 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. JarkkoPFC revised this gist Sep 19, 2022. No changes.
  2. JarkkoPFC created this gist Sep 19, 2022.
    36 changes: 36 additions & 0 deletions bitonic_sort64.h
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,36 @@
    template<typename T>
    void bitonic_sort64(T vals_[64])
    {
    int h=-1;
    do
    {
    for(unsigned i=0; i<32; ++i)
    {
    unsigned idx0=2*i;
    unsigned idx1=4*(i&h)-2*(i+h)-1;
    T v0=vals_[idx0];
    T v1=vals_[idx1];
    if((idx0<idx1)^(v0<v1))
    {
    vals_[idx0]=v1;
    vals_[idx1]=v0;
    }
    }
    for(int hh=h; !(hh&1);)
    {
    hh>>=1;
    for(unsigned i=0; i<32; ++i)
    {
    unsigned idx0=2*(i&hh)+(i&~hh);
    unsigned idx1=idx0+1+~hh;
    T v0=vals_[idx0];
    T v1=vals_[idx1];
    if(v0>v1)
    {
    vals_[idx0]=v1;
    vals_[idx1]=v0;
    }
    }
    }
    h*=2;
    } while(h!=-64);