Code! ..of what?

by MSX Resource Center on 18-10-2009, 21:10
Topic: Bussum 2007

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Comments (8)

By mth

Champion (482)

mth's picture

09-10-2007, 01:39

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

By ro

Guardian (4104)

ro's picture

17-10-2007, 08:57

here's an optimalisation of the lower loop:

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

Smile

By ro

Guardian (4104)

ro's picture

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!

By Edwin

Paragon (1182)

Edwin's picture

17-10-2007, 22:45

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

By Prodatron

Paragon (1788)

Prodatron's picture

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.

By Prodatron

Paragon (1788)

Prodatron's picture

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

By ro

Guardian (4104)

ro's picture

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

By mth

Champion (482)

mth's picture

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