Language.ArrayForth.Opcode

Documentation

type F18Word = Word18

The 18-bit word type used by Greenarrays chips.

data Opcode

Each F18A instruction, ordered by opcode.

Constructors

Ret

Exec

Jmp

Call

Unext

Next

If

MinusIf

FetchP

FetchPlus

FetchB

Fetch

StoreP

StorePlus

StoreB

Store

MultiplyStep

Times2

Div2

Not

Plus

And

Or

Drop

Dup

Pop

Over

ReadA

Nop

Push

SetB

SetA

Instances

Bounded Opcode

Enum Opcode

Eq Opcode

Read Opcode

Show Opcode

names :: [String]

The names of the different instructions, ordered by opcode.

opcodes :: [Opcode]

All of the opcodes, in order.

readOpcode :: String -> Either ParseError Opcode

Tries to read a given string as an opcode from the list of names.

toOpcode :: F18Word -> Opcode

Converts a word to an opcode. The word has to be < 32.

fromOpcode :: Opcode -> F18Word

Converts an Opcode to its 18-bit word representation.

isJump :: Opcode -> Bool

Returns whether the given opcode is a jump instruction expecting an address.

slot3 :: Opcode -> Bool

Can the given opcode go in the last slot?

opcodeTime :: Opcode -> Double

Estimates how long a given opcode will take to execute. Normal opcodes take 1.5 nanoseconds where ones that access the memory take 5 nanoseconds.