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Started by ●August 26, 2005
Reply by ●August 26, 20052005-08-26
Hi,
I had this same problem with my program crashing because of too many nested
loops. What I did was to implement outer loops using just an ordinary
register as the counter and an ordinary test instead of the zero-overhead
Do..Until. I often used the af register because it was a shade faster than
using a register in data memory. I saved the zero-overhead looping for when
it was really needed.
I guess this won't be much use if you're programming something object
oriented in C :-/
{Initialise outer loop counter}
ax000;
af=pass ax0;
{Outer loop}
outerloop: cntr00;
{Inner loop:}
do innerloop until ce;
{Payload - gets executed 1 million times or thereabouts}
innerloop:
{Outer loop decrement and test}
af-1;
if gt goto outerloop; Steve Conner
http://www.optosci.com/
I had this same problem with my program crashing because of too many nested
loops. What I did was to implement outer loops using just an ordinary
register as the counter and an ordinary test instead of the zero-overhead
Do..Until. I often used the af register because it was a shade faster than
using a register in data memory. I saved the zero-overhead looping for when
it was really needed.
I guess this won't be much use if you're programming something object
oriented in C :-/
{Initialise outer loop counter}
ax000;
af=pass ax0;
{Outer loop}
outerloop: cntr00;
{Inner loop:}
do innerloop until ce;
{Payload - gets executed 1 million times or thereabouts}
innerloop:
{Outer loop decrement and test}
af-1;
if gt goto outerloop; Steve Conner
http://www.optosci.com/
Reply by ●August 30, 20052005-08-30
The original poster of this query was also asking about stack control. The
ADSP-2181 has the PUSH, POP, and TOPPCSTACK instructions- see pages 15-84
and 15-85 of the ADSP-2100 Family User's Manual. Also see page 3-9.
The instructions are not too comprehensive: The loop stack can't be pushed,
and when you pop it, the popped value goes in the "Bit bin".
Steve Conner
ADSP-2181 has the PUSH, POP, and TOPPCSTACK instructions- see pages 15-84
and 15-85 of the ADSP-2100 Family User's Manual. Also see page 3-9.
The instructions are not too comprehensive: The loop stack can't be pushed,
and when you pop it, the popped value goes in the "Bit bin".
Steve Conner
