Re: [avr-gcc-list] Success running the testsuite with avrtest

[Paulo Marques]

Quoting "Dmitry K." <address@hidden>:

> On Thursday 17 January 2008 22:13, Paulo Marques wrote:
> [...]
> > How do you come up with these tests? You're actually reading avrtest
> > source code , finding bugs and then coming up with code that exposes
> > them, aren't you?
>
> Hi Paulo, hi all.

Hi, Dmitry

> Of course, a reading of source is the best debug method.

It sure is.

> Note, it was only a quick and superficial look. I skip
> instructions and flags, which C compiler does not use.

Yes, but a different pair of eyes always catches different bugs. The 
code always looks better to the person who wrote it ;)

> If it will a time at the week-end, I will to apply
> yours avrtest to the Avr-libc's set of tests.

Great :)

Say, one of the things I wanted to implement, was something like an 
include file with (just a rough sketch):

#define COUNTER_CTRL_PORT  0x56

static void avrtest_counter_start(byte counter)
{
 *((volatile unsigned char *) COUNTER_CTRL_PORT) = counter;
}

static void avrtest_counter_stop(byte counter)
{
 *((volatile unsigned char *) COUNTER_CTRL_PORT) = 0x80 | counter;
}

So that you could do things like:

void main(void)
{
 volatile float a, b;

 // test log performance
 a = 1.2345;
 avrtest_counter_start(0);
 b = log(a);
 avrtest_counter_stop(0);

 // test sin performance
 a = 1.2345;
 avrtest_counter_start(1);
 b = sin(a);
 avrtest_counter_stop(1);
}

and then avrtest would output something like:

counter 0: 234 cycles
counter 1: 576 cycles

but I still am not too fond of this interface...

What I would like this interface to achieve:

- be able to start / stop the counters without affecting cycle counts

- format the output in a way that makes it easier to automate tests and 
compare results

- when a program reuses the same counter, we could be able to give 
maximum, minimum and average cycle counts

Since you seem to frequently produce cycle counts for your floating 
point operations and other libc functions, what would you like this 
interface to be able to do?

--
Paulo Marques


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