hex.xor_byte_from_ptr

Effectively:  dst[:2] ^= *ptr
dst is a hex[2:]. ptr is a hex[:w/4] that holds an address, which we assume is dw-aligned.

Signature

def xor_byte_from_ptr dst, ptr < hex.pointers.read_byte { ... }

Defined in hex/pointers/xor_from_pointer.fj — lines 16–20 (view on GitHub).

Complexity

• Time: w(0.75@+ 5) + 7@+13

• Space: w(0.75@+29) + 7@+48

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

Source

Click to view the macro body

def xor_byte_from_ptr dst, ptr < hex.pointers.read_byte {
    .pointers.set_flip_and_jump_pointers ptr
    .pointers.read_byte_from_inners_ptrs
    .xor 2, dst, hex.pointers.read_byte
}

Depends on

• hex.pointers.read_byte_from_inners_ptrs

• hex.pointers.set_flip_and_jump_pointers

• hex.xor/3

Used by

• hex.read_byte/2

Example uses

• hex.read_byte in hex/pointers/read_pointers.fj

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