[squeakdev] Two's Complement and Squeak Integers
Eric Gade
eric.gade at gmail.com
Tue Jun 16 16:35:51 UTC 2020
Hi everyone,
I'm smack in the middle of making some RISCV tools in Squeak, which means
I'm dealing with a lot of lowlevel bit manipulation.
One question I have is how best to deal with two's complement
representations of integers in Squeak, and how to translate between the
different (positive v negative) values based on a given set of bits (or a
byteArray or whatever).
For example, doing the following:
1 printStringBase: 2 nDigits: 8. "11111111"
Gives the expected binary value "11111111"
However (and as we should expect), evaluating the following:
2r11111111. "255"
Gives the (again, expected) value 255.
My question is: what is the best way to convert between the complements in
Squeak? How can I take 255, examine its bits, and get 1 as the response
(or convert in the reverse)? I'm assuming there are already ways to deal
with this, I just cannot find them.
Thanks!

Eric
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