Never ever ‘declaw’ your cat or any other cat for that matter. NEVER.

I reported a bug at GCC:

Which was closed because apparently the relevant flag for this is -ffp-contract which defaults to "=fast" which can apparently violate the language standard.

I'm really shocked that GCC thinks it's ok to violate the language standard in "normal" optimization levels - this is what -Ofast and -ffast-math etc are for!

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Unfortunately fmsub uses a "infinite precision intermediate result" for the multiplication, so in the end you get the difference between the multiplications in double(?) precision and in single precision, which often is not 0.
This already happens with relatively small values in the hundreds. Clang only does this with -ffast-math (which is OK).

Godbolt link:

More elaborate writeup at

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TIL that GCC miscompiles cross product calculations if the x86 FMA extension is enabled and -O2 or higher is used (*without* -ffast-math or similar).
float z = v1.x * v2.y - v1.y * v2.x should be 0.0 if both multiplications have the same result (like when v1==v2), but it isn't, because GCC tries to be clever and does a normal multiplication for v1.y*v2.x (stored as 32bit float), but then uses vfmsub132ss for v1.x * v2.y and subtracting the other result.

Listening to fitness advice from people who experience runner's high is like listening to dating advice from hot people.

Head's up: #Qualys teared the #Exim MTA literally apart. They discovered 21 #vulnerabilities: 11 local vulnerabilities, and 10 remote vulnerabilities.

If you run Exim connected to the Internet or local with untrusted users, you should either patch now or shut it down.

Wow. #Signal owned #Cellebrite - a vendor that sells mobile phone hacking and extraction software to shady goverments around the work - big time.

Read this awesome article and be sure to watch the clip.


Je suis pas sûr que ça passe, mais bon, si certains veulent tester…

@thor @Jessica
2000s techie: My goal is to connect everything to the internet

2020s techie: My goal is to disconnect everything from the internet

dhewm3 1.5.1 is finally released:
Major changes since 1.5.0:
- Brought back Win32 editing tools
- Doom3 Demo data supported
- Sound timing a lot more precise
- Better fullscreen support (incl. DSR/VSR)
- Many bugfixes
- See link for more details :-)

When you setup Kubernetes to host your personal blog

bumping this for the weekend - play some Doom3 with the dhewm3 source port!

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I finally released dhewm3 1.5.1 RC3, the hopefully last release candidate for 1.5.1:

Some changes since RC2:
- Fullscreen improvements, support nvidia DSR/AMD VSR
- Updated Mod DLLs incl. the newly added LibreCoop and D3: Lost Mission
- Several Bugfixes

Please test - thanks in advance! :-)

I'm generally against corporal punishment, but I'm willing to make exceptions for people who write
if(!strcmp(a, b)) { ... }

Question to all my non German friends. Here, we watch a comedy show called "dinner for one" every new year's eve. I think every German knows that show, even the little ones.

If you are living outside Germany, do you know that show? Have you seen it before? If not, would you watch it again?

Happy new year and let's how that 2021 will be a better year!

Dear web developers and admins,
please stop embedding Google's hideous #ReCaptcha into your websites. Its algorithm is faulty, forcing regular users to click dozens or even hundreds of fire hydrants, bicycles, or traffic lights each day. It puts a 'suspicious activity' flag on users who won't obey to Google's business model - such as people who don't sign into Chrome, use anonymity VPNs, or use browser extensions to suppress common tracking mechanisms. Enough is enough. Stop it.

My long-term plan for #FreeNukum is to allow custom data for graphics, sound and level data. Now that is fully written in #Rust, it was easy to hack together a quick prototype that allows loading of custom graphics tiles as a drop-in replacement that I prepared a few years ago. This allows to experiment with mixed original and custom tiles, as shown in the screenshots.

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