Wolfenstein 3D geometry issues on BII with FPU on but not on Sheepshaver

[maxdlpee]

It's a long-standing bug, first reported on the Emaculation forums in 2015, byproduct of inaccuracies on the FPU emulation that no one has bothered to fix for a really long time. Can something finally be done for good?

This is how it looks like on BII with a 68040 (which forces the FPU to be on, even if it is disabled on the prefs file)

Same emulator with 68030 and FPU off, aka how it's supposed to look

How it looks like on SS

[rakslice]

What is the current situation with the fpu compiler options? I'm trying to figure out what the change to the fpu options was that used to fix the scrollbars in 8.x, but I can't find it.

[kanjitalk755]

In the case of Apple Silicon, we use new UAE CPU core that supports GMP/MPFR.
This is because long double is 64-bit, so legacy code cannot represent the FPU's 80-bit registers.
This is only supported when building with Xcode.

For x86_64, we use the legacy code. This is because the JIT compiler becomes unstable.