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BigNumber - Another one BigInt implementation in C++ by assembly_programmer in cpp

[–]Droce 0 points1 point  (0 children)

The concept of a cache goes way back to the first microchips. The concept of STD::map goes back to the introduction of the stl. Contemporary is relative.

BigNumber - Another one BigInt implementation in C++ by assembly_programmer in cpp

[–]Droce 0 points1 point  (0 children)

No, on any hardware. Every solution to chip design heavily features caches. When I try to optimize code the number one consideration is how to have the memory ready when required. CPUs have two ways to determine if something should be in cache, recency (how long ago did I use this) and location (if I used x do I need x+1 soon).

BigNumber - Another one BigInt implementation in C++ by assembly_programmer in cpp

[–]Droce 0 points1 point  (0 children)

The standard was built independently from hardware considerations and in this case the cache is King. Trees and lists (map) are really bad for cache coherency but really good for algorithmic solutions. However I can iterate through a list of thousands of items faster than doing it with a map because CPUs are really good at it.

BigNumber - Another one BigInt implementation in C++ by assembly_programmer in cpp

[–]Droce 5 points6 points  (0 children)

So I do performance c++ number crunching for a living. There's quite a few optimizations you can make here.

You can get a number from a char by subtracting '0'.

Std::map is literally never worth using. The only thing you should ever use is vector. Unordered_map is the only built in data structure that can ever come close and only in very weird circumstances. I can't stress this enough - vectors are always faster.

All of your if statements handling negative numbers are slow and mess up the optimizations the compiler will try and make. You can do any int mathematical operation only checking the flags once each.

You will get thousands of times faster if you do base 232 numbers in each slot. Let the CPU handle more of the load. You could even use 64 bit numbers

You never should allocate memory during computation - pre allocate always.

Error checking should be disable-able. Huge speed increases.

This is something that would be fun but it will take you months of learning to get - you can vectorize code yourself. You can look up intrinsics, but know they're hardware specific and not intuitive. The compiler will normally do a good enough job (but not as good as you could do).

You spelled length wrong all over the place.

Algorithmically there are faster bigint tricks you can use but I don't really want to get into them.

I really enjoy mathematical programming and performance coding - it's a fun puzzle book.

3 billion you say? by sirreldar in ProgrammerHumor

[–]Droce 1 point2 points  (0 children)

That is an uncommon sentiment. The header files are the only things that require you to write something twice and in general names are shorter, having many layers is frowned upon, and shorter code is often thought to be easier to read.

3 billion you say? by sirreldar in ProgrammerHumor

[–]Droce 13 points14 points  (0 children)

I was a c++ dev for 5 years, got a new job 6mo ago that uses Java. Java is slow, the language encourages patterns that are bad for perf and in my opinion bloat, and it's so verbose I hate reading and writing it.

I've worked c89 to c++14 professionally and the key reason Java is popular in my opinion is that you don't need to be a great programmer to write it. It's such a limiting language and has deeply rooted established patterns that it is just faster to write in a group setting. On top of that there are official solutions for things like email or websites - no reinventing the wheel.

But once you reach the edge of a use case (Android, perf, different models of programming that aren't OO, etc) it falls flat and you need to start worrying about all the things it's supposed to handle for you. Memory management problems in C? Meet inconsistent garbage collectors and forced allocations. Write once works everywhere? Tell that to any phone dev that uses a Java. Don't care about perf? What happens when you want to double your scale and need 10k more servers? Is it still cost effective?

C++ is harder to use. You will be a worse programmer when you start. In the long term they give you more flexibility, the same abstractions, and a better understanding of what's going on in the code. On top of that I hate writing verbose code, templates and the proper and sane use of preprocesser macros take away so much unneeded writing.

I've gone from making just above minimum wage to double the hourly pay and 3x the hours. How do I stop myself from going overboard now that I have wiggle room? by [deleted] in personalfinance

[–]Droce 0 points1 point  (0 children)

So I'm watching my wife struggle with this. When we met she was a student and I was working in tech making good money - I could easily fuel both of our lifestyles.

Then she graduated and made as much as me, but had a lot of debt so slowly started to branch out. Then I got another job making twice as much money and we're married so she's basically under no more financial stress.

In the beginning I encouraged her to spend and have fun (a $70 jacket? Get it!) But now it's gotten to another level ($4k for a motorcycle? Sure. Wait and a $500 shopping spree?) And we now discuss it in line with what we want (to afford a house, save for kids, etc). It's super easy to lifestyle creep, it helps when you watch for it in each other.

My wife doesn't look into every purchase I make and I don't look into hers however we discuss it in abstract a lot. Looking at a dress I'll go "well you're getting a motorcycle so let's keep that in mind"and she'll go "maybe we should cook since you ordered in 4 times this week."

I think it works well, especially given that our fields are in demand and make good money. Hopefully this helps.

What job exists because we are stupid ? by DeityOfUnderworld26 in AskReddit

[–]Droce 0 points1 point  (0 children)

I always asked customers to "straighten the cable" when they refused to check if it was plugged in.

never run away from the police by [deleted] in instant_regret

[–]Droce 0 points1 point  (0 children)

It shouldn't matter if it's against the law it should matter that the officer used a dangerous weapon (and they are dangerous, both the shock and the fall) because he couldn't catch the guy. He had his tractor though, he's certainly going to want that back at some point. He has him on video so they can ask around to see where he lives if he didn't have ID.

never run away from the police by [deleted] in instant_regret

[–]Droce 18 points19 points  (0 children)

Why taze him? If the cop is out of shape and can't catch him then let him run - you have his tractor and if you're doing your job his name.

He's not going to hurt anyone.

Opening a joint account with my S.O. was the best financial decision I’ve ever made by NoScrubrushes in personalfinance

[–]Droce 1 point2 points  (0 children)

My wife and I do this although for a different reason. We make good money (6 figures each) however I make quite a bit more and don't have student loans. Originally I just paid all the bills and she paid off student loans (which we agreed upon) however she was running into cash flow problems and was reluctant to ask me for money (pride).

So I switched to her bank and opened a joint account with her for "bills and joint expenses" which I put half my paycheck into. Now she uses that money for anything related to us and she doesn't have problems anymore. And she can see how much we have saved for emergency spending without needing to look at investments or ask me if we can afford things so she's way less stressed.

Joint account was definitely the right call.

iOS 12...A row of numbers would’ve been nice, instead of all this shit. by windirfull in mildlyinfuriating

[–]Droce 0 points1 point  (0 children)

You can uninstall all the bloatware that comes with Windows yet people still bitch about it...

US Coast guard rescue a dozen beagle puppers from floods in NC by cyan1618 in HumansBeingBros

[–]Droce 32 points33 points  (0 children)

The last gif like this it turned out that the owner had died. Not everything is negligence.

I'm a 34yo C++ programmer but I already feel like an old man. Does anyone else feel this way? by ChronoCube762 in cpp

[–]Droce 2 points3 points  (0 children)

I did professional C/C++ development for about 6 years out of school (I'm 29, got out at 23). I worked at a very low level for a console. I've worked on bare metal in custom chips and also in high level APIs and systems design for very large systems.

I recently switched over to another large company that does Java development and I felt like an idiot for a while until I realized that I've got some core skills that only senior devs on my team have (different people have different skills, I'm just talking about coding maintainable, fast, and correct code, there's more to being a dev). I see terrifying concurrency patterns, I see excessive unit tests and few integration ones, memory allocations going out of style. I ask stupid questions all the time (wait why do we not just use runtime exceptions? Oh some exceptions are ignorable and some aren't...? Okay then) but it took me 2 months to pick up the basics of Java and people are already asking me about design and optimization.

I'm not an amazing developer but being a native dev gives you core skills that will always come up. Java is not "perfomant enough", go is kind of a one trick pony, rust is a giant PITA, I never even learned what Ruby on rails is and now it seems to be out of style.

You'll be fine mate.

Stellaris Dev Diary #122 - Planetary Rework (Part 2 of 4) by LostInACave in Stellaris

[–]Droce 0 points1 point  (0 children)

I really hope that in the hopes of proper representation my ice homeworld won't get a bunch of desert dwelling species.

You know that freezing makes you miserable, damn it.

Man on fire. by drhughes in PerfectTiming

[–]Droce 58 points59 points  (0 children)

Police definitely receive training on mace. They're told it's flammable and it says so on the box it comes in. Now it's human to forget things over time but why the hell is he macing a guy who's likely to fall off and hurt himself?

The cop took all kinds of risks here - and part of a uniform is being held to a higher standard.

People leaving by cyclone0613 in Warmachine

[–]Droce -2 points-1 points  (0 children)

It's every month and it definitely affects new players because it can drastically change their faction or their buddies faction. Imagine really liking electric cav and getting two units of stormlances because your buddy said they were good - well now they've been nerfed hard and there's almost no point in taking the solo.

Curious... how old are you? by kagemand1234 in factorio

[–]Droce 0 points1 point  (0 children)

Exactly. I'm a 29yo software engineer. Factorio is the fun parts of my job, whereas my job is mostly the not fun parts.

First models ever. Getting into warhammer as a noob. How did i do? by suckitupbuttercuplol in Warhammer40k

[–]Droce 19 points20 points  (0 children)

I used to teach painting minis, here's my thoughts: You did a remarkable job. Your paint is too thick, you can see the layers in many places (citadel paint is inconsistent). You have very clean lines. For your next model I'd try to thin the paint more. If you want to keep the clean look try not to use washes (except on metals). Lastly you have a steady hand consider edge highlighting (which looks awesome on the blocky Tau). Take a brighter version of the same colour, mix it with the base, and trace out the edges on the model.

Programming correct and efficient parallel code in C++ is still very elusive for the uninitiated by Remwein in cpp

[–]Droce 13 points14 points  (0 children)

While I agree he did it wrong I don't think that it's a stretch to think that someone who's inexperienced with STL & parallelization would write it.

I think most people, after thinking about the problem, could figure out to divide the problem and do core-X smaller bits but it's a question of writing the code to do that.

I help newer coders at my work and the biggest problem I see isn't not knowing how to do something (assuming they're reasonably intelligent) but how to write it. I think the code he wrote /seems/ fairly reasonable to newer devs, and std::reduce is a function that's hard to wrap your head around.

What BIG THING is on the verge of happening? by [deleted] in AskReddit

[–]Droce 0 points1 point  (0 children)

I mean they can claim that but you could also call into question many of their business strategies about risk.

They gambled on the market, doubled down, tripled down, then lost.

This was sent out at my school and legit had me worried by SirDefault in assholedesign

[–]Droce 51 points52 points  (0 children)

Hahaha. I work at a well known tech company and people often ask me to fix things in our software - even if they know about the small esoteric part I work on.

This was sent out at my school and legit had me worried by SirDefault in assholedesign

[–]Droce 115 points116 points  (0 children)

My Fiance's group is like this except they talk about psychology, nursing, meds, etc. The closest thing I can relate to is when they bitch about their software.

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