Found a way to emulate Banked registers and improve decomp. output - WIP

[rnd-ash]

@esaulenka After a lot of messing around, I found a way to emulate the banked registers. It needs a lot of work tho to improve the decopilation output, but now, it can accurately decompile the init function (Although messy) for an ECU that uses C167 (Daimler EGS52).

macro load_wgpr() {
	local addr:2 = CP; # Take value of ContextPointer, treat it as an address
        *[register]:2 (addr+0x00) = r0; # Load register values into the memory addresses needed
	*[register]:2 (addr+0x02) = r1;
	*[register]:2 (addr+0x04) = r2;
	*[register]:2 (addr+0x06) = r3;
	*[register]:2 (addr+0x08) = r4;
	*[register]:2 (addr+0x0A) = r5;
	*[register]:2 (addr+0x0C) = r6;
	*[register]:2 (addr+0x0E) = r7;
	*[register]:2 (addr+0x10) = r8;
	*[register]:2 (addr+0x12) = r9;
	*[register]:2 (addr+0x14) = r10;
	*[register]:2 (addr+0x16) = r11;
	*[register]:2 (addr+0x18) = r12;
	*[register]:2 (addr+0x1A) = r13;
	*[register]:2 (addr+0x1C) = r14;
	*[register]:2 (addr+0x1E) = r15;
}

macro save_wgpr() {
	local addr:2 = CP; # Take value of ContextPointer, treat it as an address
        r0  = *[register]:2 (addr+0x00); # Save value from memory into register
	r1  = *[register]:2 (addr+0x02);
	r2  = *[register]:2 (addr+0x04);
	r3  = *[register]:2 (addr+0x06);
	r4  = *[register]:2 (addr+0x08);
	r5  = *[register]:2 (addr+0x0A);
	r6  = *[register]:2 (addr+0x0C);
	r7  = *[register]:2 (addr+0x0E);
	r8  = *[register]:2 (addr+0x10);
	r9  = *[register]:2 (addr+0x12);
	r10 = *[register]:2 (addr+0x14);
	r11 = *[register]:2 (addr+0x16);
	r12 = *[register]:2 (addr+0x18);
	r13 = *[register]:2 (addr+0x1A);
	r14 = *[register]:2 (addr+0x1C);
	r15 = *[register]:2 (addr+0x1E);
}

usage on a function that requires Rw access:

# Rw n , #data3			08 n:0###
# Rw n , [Rw i +]		08 n:11ii
# Rw n , [Rw i ]		08 n:10ii
# Rw n , Rw m			00 nm
:add Rwn1215, op2_w is op0407=0x0 & Rwn1215 & op2_w & ExtDec {
    load_wgpr();
   add_w (Rwn1215, op2_w);
    save_wgpr();
}

output:

Register check initialization process of EGS52:

Decompiler output now:

Decompiler output before: