hex.ptr_dec

ptr[:w/4] -= 2w

Signature

def ptr_dec ptr { ... }

Defined in hex/pointers/pointer_arithmetics.fj — lines 17–19 (view on GitHub).

Complexity

• Time: 9@+23

• Space: w(0.375@ + 3.25)  + 5@+67  (for log(w) in 16,32,64,128)

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

Requires init

The following must be initialised before this macro is invoked:

• hex.sub.init (or hex.init)

Source

Click to view the macro body

def ptr_dec ptr {
    hex.sub_constant w/4, ptr, dw
}

Depends on

• hex.sub_constant

Used by

• hex.sp_dec

Example uses

• hex.sp_dec in hex/pointers/stack.fj

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