Code! ..of what?

van MSX Resource Center op 18-10-2009, 21:10
Onderwerp: Bussum 2007

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Reacties (8)

Van mth

Champion (503)

afbeelding van mth

09-10-2007, 01:39

I was told it's a comparison of the idle loop used by msd (top) and Prodatron (bottom).

Van ro

Scribe (4543)

afbeelding van ro

17-10-2007, 08:57

here's an optimalisation of the lower loop:

loop: LD HL,CNT
INC (HL)
JR LOOP

Smile

Van ro

Scribe (4543)

afbeelding van ro

17-10-2007, 17:18

eh, stupid. THIS will realy speed your program up Wink
(before anybody wanna correct me, I'll do it meself)

LD HL,CNT
LOOP: INC(HL)
JR LOOP

whateffah!

Van Edwin

Paragon (1182)

afbeelding van Edwin

17-10-2007, 22:45

/me notes in the important to remember list: don't take code advice from ro

Van Prodatron

Paragon (1801)

afbeelding van Prodatron

18-10-2007, 00:26

Hey, for the full pleasure a 16bit counter is needed, an 8bit one wouldn't be enough Tongue Inside the idle task the CPU usage doesn't matter at all, it's only important, that the task manager can show the correct load.

Van Prodatron

Paragon (1801)

afbeelding van Prodatron

18-10-2007, 00:34

Btw, if a "HALT" would switch the Z80 into energy saving mode, MSDs methode saves a lot of electricity, and we can switch off even more nuclear power plants. But as my methode measures the CPU usage more detailed, who cares Tongue Face

Van ro

Scribe (4543)

afbeelding van ro

18-10-2007, 16:37

..if only we were talking Unix here Tongue

HALT.....bzzzz, system is halted.

bravo! there's some REAL iddletime for ya!

Running Naked in a Field of Flowers

Van mth

Champion (503)

afbeelding van mth

20-10-2007, 02:13

openMSX goes to sleep on HALTs, so if you run it on a laptop or a modern desktop PC, an idle loop with HALT would indeed save some energy Smile