hex.double_exact_xor

{t3,t2,t1,t0} ^= src
{d3,d2,d1,d0} ^= src

t3,t2,t1,t0,d3,d2,d1,d0 are bit-addresses; src is hex.

Signature

def double_exact_xor t3, t2, t1, t0, d3, d2, d1, d0, src @ first_flip, second_flip, end { ... }

Defined in hex/logics.fj — lines 101–140 (view on GitHub).

Complexity

• Time: @+4

• Space: @+28

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

Source

Click to view the macro body

def double_exact_xor t3, t2, t1, t0, d3, d2, d1, d0, src @ first_flip, second_flip, end {
    wflip src+w, first_flip, src
    pad 16
  first_flip:
      ;end                  //  0
    d0;second_flip+ 0*dw    //  1
    d1;second_flip+ 1*dw    //  2
    d1;second_flip+ 2*dw    //  3
    d2;second_flip+ 3*dw    //  4
    d2;second_flip+ 4*dw    //  5
    d2;second_flip+ 5*dw    //  6
    d2;second_flip+ 6*dw    //  7
    d3;second_flip+ 7*dw    //  8
    d3;second_flip+ 8*dw    //  9
    d3;second_flip+ 9*dw    // 10
    d3;second_flip+10*dw    // 11
    d3;second_flip+11*dw    // 12
    d3;second_flip+12*dw    // 13
    d3;second_flip+13*dw    // 14
    d3;second_flip+14*dw    // 15

  second_flip:
    t0;end          //  1
    t1;end          //  2
    t1;first_flip+1*dw  //  3
    t2;end          //  4
    t2;first_flip+1*dw  //  5
    t2;first_flip+2*dw  //  6
    t2;first_flip+3*dw  //  7
    t3;end          //  8
    t3;first_flip+1*dw  //  9
    t3;first_flip+2*dw  // 10
    t3;first_flip+3*dw  // 11
    t3;first_flip+4*dw  // 12
    t3;first_flip+5*dw  // 13
    t3;first_flip+6*dw  // 14
    t3;first_flip+7*dw  // 15
  end:
    wflip src+w, first_flip
}

Used by

• hex.double_xor

Example uses

• hex.double_xor in hex/logics.fj

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