hex.ptr_flip_dbit

The stl.comp_flip_if executes in ~##w, which should be much less than @/2 operations.
Effectively:  (*ptr)+dbit;
Flip the address dbit-ahead of what the pointer points to.
ptr is a hex[:w/4] that holds an address, which we assume is dw-aligned.

Signature

def ptr_flip_dbit ptr < .pointers.to_flip { ... }

Defined in hex/pointers/xor_to_pointer.fj — lines 25–29 (view on GitHub).

Complexity

• Time: w(0.5@+2)  + @+6

• Space: w(0.5@+14) + @+6

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

Source

Click to view the macro body

def ptr_flip_dbit ptr < .pointers.to_flip {
    wflip .pointers.to_flip, dbit
    .ptr_flip ptr
    wflip .pointers.to_flip, dbit
}

Depends on

• hex.ptr_flip

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