hex.tables.jump_to_table_entry

Dispatch into a 256-padded table at entry (src<<4 | dst), then XOR hex.tables.res into dst on return. The hot path of every table-driven hex operation.

Signature

def jump_to_table_entry dst, src, jumper_to_table @ return < .ret, .res { ... }

Defined in hex/tables_init.fj — lines 75–82 (view on GitHub).

Complexity

• Time: 4@+4

• Space: 4@+52

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

Requires init

The following must be initialised before this macro is invoked:

• hex.tables.init_shared (or hex.init)

Source

Click to view the macro body

def jump_to_table_entry dst, src, jumper_to_table @ return < .ret, .res {
    ..xor jumper_to_table  , dst
    ..xor jumper_to_table+4, src
    wflip .ret+w, return, jumper_to_table
  return:
    wflip .ret+w ,return
    ..xor_zero dst, .res
}

Depends on

• hex.xor/2

• hex.xor_zero/2

Used by

• hex.add/2

• hex.and/2

• hex.or/2

• hex.sub/2

Example uses

• hex.or in hex/logics.fj

• hex.and in hex/logics.fj

• hex.add in hex/math.fj

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