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Re: WSO CCC OTD 2021-01-18

7-Jan-21 22:13

Test me, Cymru - test me! (11)

(Sorry it's late - monitors and all that ... Sigh | :sigh:

)

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
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pkfox7-Jan-21 23:48

pkfox

7-Jan-21 23:48

Examination

Test = Exam
Me = I
Cymru = Nation

Test = Examination

Nice clue

"I didn't mention the bats - he'd see them soon enough" - Hunter S Thompson - RIP

OriginalGriff8-Jan-21 0:19

8-Jan-21 0:19

I liked it!

And you are up Monday! Thumbs Up | :thumbsup:

pkfox8-Jan-21 0:23

pkfox

8-Jan-21 0:23

Took a fellow Taff to solve it though Big Grin | :-D

"I didn't mention the bats - he'd see them soon enough" - Hunter S Thompson - RIP

OriginalGriff8-Jan-21 0:29

8-Jan-21 0:29

I dunno - a quick google for "Cymru" would tell you "Wales is a country of the UK". Big Grin | :-D

yacCarsten8-Jan-21 2:19

yacCarsten

8-Jan-21 2:19

I've never heard the term "Taff" before, even though I've watched a lot of British TV.

A quick search enlighten me, you are either
- an Aussie company that makes bath bombs
- A sweet chewy candy
- a large river in Wales
- a German tabloid news programme
- an organisation for science fiction fandom (Trans-Atlantic Fan Fund)
Laugh | :laugh:

~~// TODO: Insert something here~~
Top ten reasons why I'm lazy
1.

It's going to be one of those days.

pkfox8-Jan-21 5:02

pkfox

8-Jan-21 5:02

It's a slang word for a Welshman

"I didn't mention the bats - he'd see them soon enough" - Hunter S Thompson - RIP

OriginalGriff7-Jan-21 21:38

7-Jan-21 21:38

Turn on the PC, and ... one of my monitors has died.
Powers up, shows the LG logo, detects cable, but won't ID to windows. Checked the cable, the display card connector - it's the monitor.

So now I need to replace that, and asap ... hello Amazon, what have you got for me? Hmmm ...

At least the day has to get better from here, right? Big Grin | :-D

fd97508-Jan-21 1:01

fd9750

8-Jan-21 1:01

I would not count on it.

A few weeks ago I had what looked like a starting chimney fire so I had to call the fire department to care of it/check it.

A few hours later one of the thermostats om my central heating system decided to call it a day and went up in smoke with the smell of roasted electronics to go with it.

So: don't count on things getting better, they might but you never know, murphy and all that.

theoldfool8-Jan-21 1:14

theoldfool

8-Jan-21 1:14

As I sat in my gloom, a voice came to me saying "cheer up, things could be worse". So, I cheered up. And things got worse.

Bad things come in 3's. My grandmother from Bolton taught me that.

Don't whine, you still have a monitor. Cool | :cool:

If you can keep your head while those about you are losing theirs, perhaps you don't understand the situation.

honey the codewitch8-Jan-21 1:55

8-Jan-21 1:55

theoldfool wrote:
Bad things come in 3's.

I was just about to write that. Laugh | :laugh:

Real programmers use butterflies

Forogar 8-Jan-21 2:30

Forogar

8-Jan-21 2:30

You mean you didn't have a backup monitor? Shame on you.

- I would love to change the world, but they won’t give me the source code.

OriginalGriff8-Jan-21 3:03

Learning to live without if() statements

8-Jan-21 3:03

I had 2 x 22" (one landscape, one portrait), and an old 18" square one (it used to be Herself's) so there are backups - but I miss my landscape monitor - it's where all the "real work" got done. It was reserved for "full screen" aps: Word, Excel, VS, with Chrome on the portrait, and email / small stuff on the square one.
I've ordered a new 27" to replace it which should be here tomorrow (and hopefully canceled the 24" I did order but which post-order can't be delivered until the 18th).

honey the codewitch7-Jan-21 11:07

7-Jan-21 11:07

A tale of two functions:

C++

// returns whichever is greatest
int max(int x, int y) {
	if(x>y)
		return x;
	return y;
}

and

C++

// returns whichever is greatest
int max(int x, int y) {
	return x*(x>y)+y*(x<=y);
}

do the same thing

one is much harder to read, but also optimizable in ways the other isn't.

the CPU really likes code like the second one. Even with the extra multiplies, you can use SIMD instructions to pay for that overhead, while the code doesn't interfere with branch prediction

but coding without ifs gets weird really fast. The above is simple. Now add code to do the same thing but operate on 4 32-bit ints at a time so that it efficiently uses SIMD. Or do something more complicated than finding a max of two values and you'll see what i mean.

Smart optimizing compilers can do some of this, and much of the stdlib is already optimized with simd instructions and branch prediction in mind, but when you're trying to squeeze every last cycle out of your CPU you have to take things into your own hands.

It's not something I'd normally do, but I'm working with a codebase that's already highly optimized, to try and make it faster. So this is par for the course.

Real programmers use butterflies

PIEBALDconsult7-Jan-21 11:28

PIEBALDconsult

7-Jan-21 11:28

What about a ternary operator?

honey the codewitch7-Jan-21 11:34

7-Jan-21 11:34

That's just an abbreviated if statement.

Real programmers use butterflies

trønderen7-Jan-21 11:44

trønderen

7-Jan-21 11:44

The price of salt has lately gone up so much that today, I enjoyed my breakfast egg without salt.

Peter_in_27807-Jan-21 14:47

Peter_in_2780

7-Jan-21 14:47

Enough to make you weep....

Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

Chris C-B7-Jan-21 19:43

Chris C-B

7-Jan-21 19:43

Hmmm... Your second post on this subject. Do you have a quantum computer in your basement, and need to pay strict attention to the Copenhagen Interpretation? Cool | :cool:

honey the codewitch8-Jan-21 3:00

8-Jan-21 3:00

No, but I have steve wozinak (the only good thing about apple) in my basement. I lured him there with cookies and promise of a new NeXT Big Grin | :-D

Real programmers use butterflies

CPallini7-Jan-21 20:10

CPallini

7-Jan-21 20:10

C++

// returns whichever is greatest
int max(int x, int y) {
      return x*(x>y)+y*(x<=y);
}




      |                |
      |  OPTIMIZATION  |
      |  OPTIMIZATION  |
      |  OPTIMIZATION  |
      |  OPTIMIZATION  |
      |  OPTIMIZATION  |
      |  OPTIMIZATION  |
   ----                ----
   \                      /
    \                    /
     \                  /
      \                /
       \              /
        \            /
         \          /
          \        /
           \      /
            \    /
             \  /
              \/






// returns whichever is greatest
int max(int x, int y)
{
  if (x > y)
    return x;
  return y;
}

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

honey the codewitch8-Jan-21 1:53

8-Jan-21 1:53

that would figure Laugh | :laugh:

Real programmers use butterflies

Shao Voon Wong8-Jan-21 0:45

Shao Voon Wong

8-Jan-21 0:45

This version uses table lookup, no branching.

C++

int max(int x, int y)
{
  int arr[2] = {y, x};
  return arr[(int)(x > y)];
}

honey the codewitch8-Jan-21 1:53

8-Jan-21 1:53

well played

though you do some memory writes there, which might not be a great thing. then again, it might never leave CPU cache anyway. it's definitely more readable than my approach.

Real programmers use butterflies

modified 8-Jan-21 8:56am.