brainfuck_processor/assembly/complex_assembly.md

Complex Assembly Functions

Memory sections

1. Register Area
2. Stack
3. Open Memory

Navigation between sections

• Compiler logs current position
• Registers can be navigated relative to zero index

Registers

$r0 := 0 (constant to be replaced in code) $r1 .. $r31 := all purpose registers $io := Input/Output register (translates to read / write instruction) $t1 .. $t8:= Registers to be used by the assembler only

Register cell map

cell	register	description
0	$t1	Start of hidden registers
8	$r1	All purpose programmable registers
40	$mem	Random access memory

Add function

1. Store current position
2. Move to reg 1
3. move reg 1 into t1, t2
4. move t2 into reg 1
5. move to t1
6. move t1 to reg 2
7. return to starting position

add $10 $11:

Setup: >>>>>>>>>>>>>>>>>>++++++++++>+++++<<<<<<<<<<<<<<<<<<<

Move to reg1: >>>>>>>>>>>>>>>>>> (move to operation) Move reg 1 into t1, t2: [-<<<<<<<<<<<<<<<<<<+>+>>>>>>>>>>>>>>>>>] (reg1 to t1) Move t2 into reg 1: <<<<<<<<<<<<<<<<<[->>>>>>>>>>>>>>>>>+<<<<<<<<<<<<<<<<<] (reg1 to t2) Move to t1: < Move t1 to reg 2: [->>>>>>>>>>>>>>>>>>>+<<<<<<<<<<<<<<<<<<<] (t2 to reg2)

Optimization possible:

1. Moving reg1 to t1
2. Moving t1 to reg1 and reg2
3. Return to starting position

(Further optimization by checking the distances of reg1, reg2, t1 to avoid unnecessary steps)

sub $5, $12

1. Move reg1 into t1
2. Move t1 into reg1, remove from reg2

while reg1: reg1 -- t1 ++

loop

Must store loop register and origin Origin should be always the loop register inside loop Old origin should be set on loopend