fCPU

by extermeon

Factorio Customizable Processing Unit. Allow to write any logic on low level machine code. The fCPU acts like a programmable microcontroller with a vector coprocessor that supports many useful instructions.

Content

3 months ago

0.18 - 1.1

8.51K

source code

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g how do the rotate instructions work exactly?

Mernom

3 years ago

What's the difference between rotating left and right? And how does it select the axis around which to rotate it?

chiko

3 years ago

Rotation seems to constrain the register to a 32(31) bit value

Rotating left is equiv to shifting the bits left and wrapping around the remaining bits

0000 0000 0000 0000 0000 0000 0000 0001 = 1
1000 0000 0000 0000 0000 0000 0000 0000 = 2,147,483,648 (note it doesn't modify the sign bit)

rotating right shifts 1 to 2 billion
rotating left would make 1 equal to 2

hopefully that answers your question, feel free to jump in the discord if you need more info.

https://discord.gg/DNZeM5Fc

extermeon

3 years ago

(updated 3 years ago)

This instructions is similar to x86 asm:
fCPU bsr = x86 shr
fCPU bsl = x86 shl
fCPU brr = x86 ror
fCPU brl = x86 rol

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