DDraceNetwork - developer

<ChillerDragon> https://zillyhuhn.com/cs/.1722475642.png

01:28

<ChillerDragon> Does someone know why it uses jne 115d here? whats 115d? Why does it say jump not equal when i use == in C ?

01:33

<ChillerDragon> Ah i get it. So 115d is the memory address it jumps to. Which is the line after the puts call. Seems so straightforward now haha.

sega dreamcast

Headshot

sega dreamcast

stop this, at this rate you'll get it in TI-84

<ChillerDragon> epic

<ChillerDragon> how is two dwords not the same as one qword???

02:34

<ChillerDragon> https://zillyhuhn.com/cs/.1722479611.png

02:34

<ChillerDragon> https://paste.zillyhuhn.com/f8

02:35

<ChillerDragon> can mov only do 32 bit max?

gm

ChillerDragon

[ddnet/ddnet] Pull request opened: #8671 Fix first typo

<ChillerDragon> Intoroducing typos and then fixing them is infinite commit glitch

03:48

<ChillerDragon> Intoroducing gg

ddnet-maps

[ddnet-maps:master] 1 new commit

ab0b1aa A Grenadium - ddnet-maps

Learath2

Check out the dinosaur book too, you can lmk if its any good

Ok, did you read the dragon book btw? justatest

github-merge-queue[bot]

[ddnet:master] 2 new commits

ef1d5fa Fix first typo - ChillerDragon 44ff68a Merge pull request #8671 from ChillerDragon/pr_fix_furst - Jupeyy

06:15

Jupeyy

[ddnet/ddnet] Pull request closed: #8671 Fix first typo

ws-client

<ChillerDragon> can mov only do 32 bit max?

No

MilkeeyCat

Ok, did you read the dragon book btw? justatest

Nope, I did skim through a couple pages but I didn't really think I could read it. Looked far too detailed

<ChillerDragon> TRIVIA TIME!!!!!!!!!!

06:22

<ChillerDragon> https://zillyhuhn.com/cs/.1722493331.png

06:22

<ChillerDragon> is this nasm assembly or ruby code?

Nasm

<ChillerDragon> -.- yes

06:29

<ChillerDragon> but it looks as hot as ruby

06:30

<ChillerDragon> or at least not much more verbose than the C++ version :p

06:30

<ChillerDragon> https://zillyhuhn.com/cs/.1722493445.png

Honestly props, I actually could never be assed to do this in assembly

<ChillerDragon> u asmr pro

06:41

<ChillerDragon> lea rath, 2

morning

main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16

@Learath2 can i write in [rbp]? (edited)

Why not?

Learath2

Why not?

why does gcc move first variable in [rbp-1] ;-;

MilkeeyCat

main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16

@Learath2 can i write in [rbp]? (edited)

stop learning. you are making me jealous

fr

MilkeeyCat

why does gcc move first variable in [rbp-1] ;-;

Why not?

guess the razer order

fair

meloƞ

guess the razer order

broken graphics overlays

close

Jupstar ✪

broken graphics overlays

go PR

meloƞ

guess the razer order

the cheating keyboard

TsFreddie

the cheating keyboard

exactly

meloƞ

go PR

are they open source?

meloƞ

go PR

is it open source?

i'd buy wooting really

XD god damn it, no i dont think so LMAO

xD

07:57

wait

07:58

xDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

07:58

is that new record?

TsFreddie

i'd buy wooting really

nah my current one is broken and i cba to wait 1 1/2 months for shipping

07:58

even tho i considered it

meloƞ

nah my current one is broken and i cba to wait 1 1/2 months for shipping

i would give you mine if i'm german

come visit me jupsti and chiller frfr

MilkeeyCat

why does gcc move first variable in [rbp-1] ;-;

with what opt flag is that?

we need to get chiller back into germany first tho...

meloƞ

come visit me jupsti and chiller frfr

just got my passport

i think now he could visit chiller xd

i mean just renewed my passport

in asia

Jupstar ✪

with what opt flag is that?

i don't have any custom flags

where is chiller now?

07:59

chillerdragon: where

somewhere sunny

07:59

dude constantly just heads out to the beach

but it's always sunny in philadelphia

MilkeeyCat

i don't have any custom flags

do -Ofast then your whole function is gone

07:59

Jupstar ✪

do -Ofast then your whole function is gone

explain more

time to ask chat gpt

-Ofast, more like -Oignore-standards-and-break-my-code

I dont directly agree with the second but yes

08:01

for floating points it could indeed break your code

cool

even -O1 already removes your code

08:01

so Ofast not needed here

08:02

then do static void fn

08:02

then the definition is gone too

08:02

xd

MilkeeyCat

main:
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16

@Learath2 can i write in [rbp]? (edited)

I was hoping you'd elaborate more but given this conversation is quickly fleeting. I wanted to say that writing directly to [rbp] isn't fine. Writing to offsets from it is obviously fine, that's it's point

08:03

Now that I look again at the question, perhaps you were confused as to why gcc wasn't using [rbp] for the first variable

yep

we got a thinker

so if i do sub rsp, 3 i can write to [rbp - 1..=3]? (edited)

you must only adjust rsp by multiples of 16

it works for now, if it breaks one day because of alignment ill fix it

it'll likely break in random places

‍♀️

it will be fun debug experience

@MilkeeyCat will u also write an optimizer?

Jupstar ✪

@MilkeeyCat will u also write an optimizer?

i know only about constant folding xd

what are you writing exactly? @MilkeeyCat

TsFreddie

what are you writing exactly? @MilkeeyCat

a compiler for cringe version of C language

epic

but now it's more like a calculator with functions lol

MilkeeyCat

a compiler for cringe version of C language

don't forget to add a SPIR-V target.

Sorry, I got pinged on slack by my capitalist overlords, but I think you have it figured out

Jupstar ✪

don't forget to add a SPIR-V target.

is SPIR-V general purpose

Jupstar ✪

don't forget to add a SPIR-V target.

you can always make a pr with a new target

TsFreddie

is SPIR-V general purpose

i assume so

i thought it was shader only

@MilkeeyCat https://eli.thegreenplace.net/2011/09/06/stack-frame-layout-on-x86-64/ this is a pretty nice blogpost. Probably what clicked it for me

TsFreddie

i thought it was shader only

i mean aren't shaders also general purpose?

08:13

compute shaders are pretty OG

Jupstar ✪

i mean aren't shaders also general purpose?

are they tho

Learath2

@MilkeeyCat https://eli.thegreenplace.net/2011/09/06/stack-frame-layout-on-x86-64/ this is a pretty nice blogpost. Probably what clicked it for me

you already sent this blog post, and I've read it :DD

TsFreddie

are they tho

are they arent

huh really? I don't remember sending it

Jupstar ✪

are they arent

why do we need cuda again?

TsFreddie

why do we need cuda again?

to get more performance

08:16

on nvidia cards

are shaders slow?

no, but sometimes the 10% more perf matter

08:17

cuda also isnt perfect, it will be replaced sooner or later

i don't understand i guess

08:18

i always wondered why AI stuff isn't just a bunch of compute shaders

Learath2

https://eli.thegreenplace.net/2012/01/03/understanding-the-x64-code-models this is a nice read

oh I remember this link, I probably checked that post myself xd

TsFreddie

i don't understand i guess

compute shaders are a try to basically merge OpenCL into OpenGL so vulkan can basically do both

08:18

and OpenCL is basically cuda in bad

08:18

MilkeeyCat

oh I remember this link, I probably checked that post myself xd

The entire blog is pretty good eli very smort

TsFreddie

i always wondered why AI stuff isn't just a bunch of compute shaders

i mean strictly speaking they might even be.. compute here simply means that it doesnt follow the concept of graphics pipelines

08:19

at least not as a hard requirement

Learath2

The entire blog is pretty good eli very smort

yep, even cave man like me learnt a lot of new xd

08:21

comment left, problem solved, code commited greenthing

Jupstar ✪

at least not as a hard requirement

still don't understand but i'm mentally tapped out

MilkeeyCat

comment left, problem solved, code commited greenthing

Without the -1 you are writing to [rbp], destroying your very initial push rbp

TsFreddie

still don't understand but i'm mentally tapped out

ok, make sure to not crash when tabbing in again.. drivers are very unstable

[rsp] points to the lowest byte of what you pushed

08:25

[rsp] to [rsp+7] is the last push

08:26

so if you do push rbp; mov rbp, rsp; mov [rbp], 0, then you're destroying a byte of the pushed, old rbp

ok, i get it now, thanks a lot xd

Jupstar ✪

ok, make sure to not crash when tabbing in again.. drivers are very unstable

i think i'm just stupid

TsFreddie

i think i'm just stupid

welcome in tha club

Jupstar ✪

welcome in tha club

club sandwich

ok now i finally have correct write only structs xD

MilkeeyCat

ok now i finally have correct write only structs xD

i guess it was an easy part and it took me so much time pepeW

@MilkeeyCat if u want to optimize seriously, u need to have a intermediate IR that is in SSA form, and if u want it more serious, you need to have tables of the target instructions with their size, latencies, etc

08:56

https://en.wikipedia.org/wiki/Static_single-assignment_form

Static single-assignment form

In compiler design, static single assignment form (often abbreviated as SSA form or simply SSA) is a type of intermediate representation (IR) where each variable is assigned exactly once. SSA is used in most high-quality optimizing compilers for imperative languages, including LLVM, the GNU Compiler Collection, and many commercial compilers. The...

08:56

this is vital

Ryozuki

https://en.wikipedia.org/wiki/Static_single-assignment_form

There was also one more form that is commonly used

interesting, even go has an ssa these days?

Actually maybe "commonly" is not the correct word

Learath2

There was also one more form that is commonly used

In functional language compilers, such as those for Scheme and ML, continuation-passing style (CPS) is generally used. SSA is formally equivalent to a well-behaved subset of CPS excluding non-local control flow, so optimizations and transformations formulated in terms of one generally apply to the other. Using CPS as the intermediate representation is more natural for higher-order functions and interprocedural analysis. CPS also easily encodes call/cc, whereas SSA does not.

08:57

its used in functional i guess

Ah perhaps I was thinking about CPS

heinrich5991

interesting, even go has an ssa these days?

they have a package https://pkg.go.dev/golang.org/x/tools/go/ssa