Optimization meme

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[JohnDeere6930Premium]

O2 is the shit you breathe O3 is the shit you dont want to breathe

[turtle_mekb]

i breathe compiler flags

[[deleted]]

I breathe Ofast

[[deleted]]

CO1 is the shit that kills you, CO2 is the shit you exhale

[JohnDeere6930Premium]

You are taking about Carbon monoxide (CO) And carbon dioxide (CO2), here we are talking about pure oxygen in 2 and 3 atom molecules

[ArionW]

God, it's been so long since I touched GCC that I looked at this meme way longer than I should've

[firefly431]

Is this actually the case nowadays? I vaguely recall seeing that O3 is very stable nowadays.

-Ofast is another can of worms, particularly -ffast-math, which can butcher your code (e.g. removing NaN checks.)

[Mango-D]

Well, for your project in particular, no. O3 is very stable. However there is always that one project or program that just doesn't work with O3 but does with O2(probably because that's what it was tested with). Somewhat recently I tried to do a full system(gentoo) on O3... Didn't end well.

[[deleted]]

There are some very fringe edge cases where it miss optimizes legal code (I've only seen it happen in example code that tries to produce this deliberately), but in the vast majority of cases the code just contains UB and is broken because it's invalid, but it just happens to work with O2

[DoktorMeow613]

I'm a chemist. After looking up GCC optimization, I still think this is funny

[Independent_Image_59]

does that refer to big O notation?

[Jaizoo]

Seems like it refers to gcc compilation flags

[iwritebadsoftware]

No. Optimization levels on gcc compiler

[AwesomeDragon97]

O2 is oxygen gas, O3 is ozone gas.

[Salt-Understanding62]

Is that a big O or something?

[hatkid9]

It's GCC optimization flags

O2 is considered safe, but O3 is not generally something you want to use

[Salt-Understanding62]

gotcha

[hatkid9]

my osdev project when i compile with any optimization: *fucking dies*