hex.exact_xor

{d3,d2,d1,d0} ^= src

d3,d2,d1,d0 are bit-addresses; src is hex.

Signature

def exact_xor d3, d2, d1, d0, src @ switch, end { ... }

Defined in hex/logics.fj — lines 28–50 (view on GitHub).

Complexity

  • Time: @

  • Space: @+12

See the complexity glossary for what @, w, dw, dbit, n mean.

Source

Click to view the macro body

def exact_xor d3, d2, d1, d0, src @ switch, end {
    wflip src+w, switch, src
    pad 16
  switch:
      ;end          //  0
    d0;end          //  1
    d1;end          //  2
    d1;switch+1*dw  //  3
    d2;end          //  4
    d2;switch+1*dw  //  5
    d2;switch+2*dw  //  6
    d2;switch+3*dw  //  7
    d3;end          //  8
    d3;switch+1*dw  //  9
    d3;switch+2*dw  // 10
    d3;switch+3*dw  // 11
    d3;switch+4*dw  // 12
    d3;switch+5*dw  // 13
    d3;switch+6*dw  // 14
    d3;switch+7*dw  // 15
  end:
    wflip src+w, switch
}

Used by

Example uses

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