b. Identify if the following items impact the ISA, ABI (but not ISA), or micro- architecture (i.e., a specific implementation of the ISA including which functional units are used and how they are interconnected). Note that some of these may have multiple answers. Provide a brief justification (1 sentence is sufficient).

i. Number of named registers

ii. Number of cycles an instruction takes to execute

iii. Whether or not immediate operands can be used directly in arithmetic instructions

iv. Which register number is the stack pointer

v. Which, if any, registers numbers produce constants (e.g., 0 or -1)

vi. Which register numbers pass arguments to function calls

vii. Which register numbers are temporary or saved

viii. Addressable address range for memory operations

ix. Type of adder used in the ALU

x. Which instructions update the PC (remember the PC holds the address of the next instruction to execute)

xi. Which bits of an instruction correspond to the opcode or an operand