Some help to optimize my new ATARI ST emu for PocketPC...

[schtruck]

so when i compil there is a problem.....

mem.c(176) : error C2296: '^' : illegal, left operand has type 'char *'
mem.c(205) : error C2296: '^' : illegal, left operand has type 'char *'
mem.c(222) : error C2296: '^' : illegal, left operand has type 'char *'

the compiler dont like we use ^ on char *

any idear?

[AndrewGower]

hmmm.. try casting addr to an int first

e.g

#define ReadB(addr) *(uint8*)((int)addr^1)

#define WriteB(addr,value) *(uint8*)((int)addr^1)=value

[schtruck]

ok that has worked:

#define ReadB(addr) *(uint8*)((int)(addr)^1)

#define WriteB(addr,value) *(uint8*)((int)(addr)^1)=value

[AndrewGower]

[AndrewGower]

[schtruck]

[schtruck]

Yeah BYTES SWAP TRICK Work!!!

the problem was that ARM can only access 32 to Address divisible only by 4..... so here is what i did:

#ifdef BYTES_SWAP
#define ReadB(address) *(uint8*)((uint32)(address)^1)
#define WriteB(address,value) *(uint8*)((uint32)(address)^1)=value
#define ReadW(addr) *(uint16*)(addr)
#define WriteW(addr,value) *(uint16*)(addr)=value
#define ReadL(address) ((*(uint16*)(address))<<16)|(*(uint16*)(address+2))
#define WriteL(address,value) WriteW(address + 2, value); WriteW(address, value>> 16)
#else
#define ReadB(address) *((int8 *) (address))
#define ReadW(addr) ((*(uint16 *)(addr) << 8) | (*(uint16 *)(addr) >> 8))
#define ReadL(address) ((uint16) ReadW(address) << 16) | (uint16) ReadW((address) + 2)
#define WriteB(address,value) *((int8 *) (address)) = (value)
#define WriteW(addr,value) *((int16 *)(addr)) = ((((uint16)(value)) << 8) | (((uint16)(value)) >> 8))
#define WriteL(address,value) WriteW((address) + 2, value); WriteW(address, (value) >> 16)
#endif


and here is what the Compiler Generate:

; 197 : WriteB(address + membase, value);

ldr r2, [pc, #0x10] ; pc+8+16 = 00000018
ldr r2, [r2]
add r3, r2, r0
eor r3, r3, #1
strb r1, [r3]

; 203 : WriteW(address + membase, value);

ldr r2, [pc, #8] ; pc+8+8 = 00000010
ldr r2, [r2]
strh r1, [r2, +r0]

; 209 : WriteL(address + membase, value);

ldr r2, [pc, #0x18] ; pc+8+24 = 00000024
ldr r3, [r2]
add r3, r3, r0
strh r1, [r3, #2]
mov r3, r1, lsr #16
ldr r1, [r2]
strh r3, [r1, +r0]


; 214 : return ReadB(address + membase);

ldr r1, [pc, #0x10] ; pc+8+16 = 00000018
ldr r1, [r1]
add r3, r1, r0
eor r3, r3, #1
ldrb r0, [r3]

; 219 : return ReadW(address + membase);

ldr r1, [pc, #8] ; pc+8+8 = 00000010
ldr r1, [r1]
ldrh r0, [r1, +r0]


; 224 : return ReadL(address + membase);

ldr r1, [pc, #0x14] ; pc+8+20 = 0000001C
ldr r1, [r1]
add r2, r1, r0
ldrh r3, [r2, #2]
ldrh r2, [r1, +r0]
orr r0, r3, r2, lsl #16


not so bad :)

let me test Game now to see How that boost....

[schtruck]

Hey andrew could you Adapt you Draw Routine for Bytes SWAP please.

[schtruck]

[Guest]

I presume you just changed the last 8 lines to

*--line_o1 = bigpal[((r4>>8)&240)+((r3>>12)&15)];
*--line_o1 = bigpal[((r2>>8)&240)+((r0>>12)&15)];
*--line_o1 = bigpal[(r4>>4)&240)+((r3>>8)&15);
*--line_o1 = bigpal[((r2>>4)&240)+((r0>>8)&15)];
*--line_o1 = bigpal[(r4&240)+((r3>>4)&15)];
*--line_o1 = bigpal[(r2&240)+((r0>>4)&15)];
*--line_o1 = bigpal[((r4<<4)&240)+(r3&15)];
*--line_o1 = bigpal[((r2<<4)&240)+(r0&15)];

and left the rest the same?

[Phantom]

[Wickie]

[Phantom]

[schtruck]

What i can say i that i'm curently preparing a Site for CastCe (the name of this ATARI ST emulator ).

Emu is being very interresting..... Andrew Gower has joined the project and is curently hardly working to optimize it and make Exact Timing to improve Compatibility.

For Now the Emulator is Fast enought (full speed) for most Game, but we expect more to Add sound....

Btw, when Emu Will be ready (hope soon, less then 2 weeks), but sound will be add later..
Just a little List of Best game curently compatible and full speed:
Dongeon Master,Xenon 1 & 2, SpeedBall,Pang, Beach Volley, Ivanhoe, R-type, Ghost& Goblin, Buggy Boy, and many others..
The Site will Start with Some Shots of this Emu running those game and more.... hope very soon.

Believe Me , that worth the Wait......
this is the Best Emu i saw on PocketPC.....

Schtruck.

[Phantom]

OK, thanks for the info. Hey, we here at Overloaded have lots of devices; if you want us to test the emu on some of them, just let me know.