...m64 -march=native -fno-bounds-check -frename-registers -frelease -O3
669171001  826ns  e28_0
669171001...

...such variables don't get assigned to registers. Structs are treated as a lump.

This...

...bit values
("0FFFFFFFFh") for RAX.

For the registers RBX through R15, the instructions "and", "or...

...compile. The problem occurs for all generic registers (RAX .. RDX R8 .. R15).

    mul   RAX,0xffffffffUL...

...pressure on to function frame stack + available registers for saving original values. Even this does...

...list didn't even have scroll-offset registers.


Do it, it's surprisingly easy, but...

...wrap native functions for script use, and registers them.

A couple other people did too...

...optimised builds, which isn't that difficult once you know what registers to look in ;-)

...text mode too (fiddling the vga palette registers, I think it is the same as...

...already pressure on the limited number of registers in x64. Some shuffling might be required...