Hardware Register Bit Operations | Dataford Interview Questions

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Problem

In embedded code for Google Pixel device drivers, low-level register access often requires changing individual bits without affecting the rest of the register. Implement a function that processes a sequence of bit operations on an unsigned register value.

Task

Write a function that takes an initial integer register, a register width width, and a list of operations. Each operation is one of:

("set", bit)
("clear", bit)
("toggle", bit)
("read", bit)

For each read operation, record whether the target bit is 0 or 1. Return the final register value and the list of read results.

Bit positions are 0-indexed from the least significant bit. All updates must stay within the lower width bits.

Constraints

1 <= width <= 32
0 <= register < 2^width
1 <= len(operations) <= 10^5
Each operation is one of set, clear, toggle, read
0 <= bit < width

Function Signature

def process_register_ops(register, width, operations):