bit.exact_xor_from_ptr

Effectively:  bit.exact_xor dst, *ptr
dst is a bit-address. ptr is a bit[:w] that holds an address, which we assume is dw-aligned.

Signature

def exact_xor_from_ptr dst, ptr @ base_jump_label, cleanup { ... }

Defined in bit/pointers.fj — lines 157–169 (view on GitHub).

Complexity

  • Time: 8w@

  • Space: 8w@

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

Requires init

The following must be initialised before this macro is invoked:

  • bit.pointers.ptr_init

Source

Click to view the macro body

def exact_xor_from_ptr dst, ptr @ base_jump_label, cleanup {
    .ptr_wflip_2nd_word ptr, base_jump_label

    .ptr_jump ptr
    pad 2
  base_jump_label:
    ;cleanup
    dst;

  cleanup:
    .ptr_wflip_2nd_word ptr, base_jump_label

}

Depends on

Used by

Example uses

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