ZDoom

Ouch! They are there, there's no need to recompile as only the non GL exe uses ASM in order to link the main one (SSE2) with SAFESEH.

[quote="drfrag"] but not in ZDoom32 (it's not the floatification). [/quote]
What happens when you compile without ASM support? (Should be in the list when you run cmake-gui - you might want to create a new build folder for this test, as changing defines recompiles the whole project)

No idea of what's going on but this thing is old, also happened in 3.3.2 but not in ZDoom32 (it's not the floatification). But there's another problem with disappearing sprites and lower performance with models enabled.
Probably it's the same issue as this one: https://forum.zdoom.org/viewtopic.php?f=56&t=62417

Probably overdue, but here's a link to the demo.
[url]https://www.moddb.com/mods/dimension-of-the-boomed/downloads/the-realm-of-z-magic-teaser[/url]

It's a map I'm presently working on. Artifacts appear regardless of position or orientation.

What WAD/map, and what are your coordinates (use IDMYPOS)?

[imgur]https://imgur.com/dFOWgor[/imgur]

The sky in this map is a dome with a scolling texture. Vertical glitches appear in the (8bit) Doom Software Renderer in GZDoom 3.7.1
Additionally the edges of sloped surfaces sometimes have visible texture glitches.

No such artifacts appear in the GL or True Colour Software Render, or in ZDoom 2.8.1