About

• A collection of functions and algorithms I've implemented using limited RISC-V instructions.
• Calling conventions follow those of CS 3410 (described below).
• Testing was done with the Cornell University RISC-V Interpreter.

Calling Conventions

Register	Name	Use
x0	zero	constant value 0
x1	ra	return address
x2	sp	stack pointer
x3	gp	global data pointer
x5 - x7	t0 - t2	temporary registers
x8 - x9	s0 - s1	saved registers
x10 - x11	a0 - a1	return values / function arguments
x12 - x17	a2 - a7	function arguments
x18 - x27	s2 - s11	saved registers
x28 - x31	t3 - t6	temporary registers

• Frame pointer (fp) and thread pointer (tp) are ignored.
• Saved registers are saved on the stack before use. Temporary registers are caller-saved.
• If there are not enough temporary registers available, use aX-a7, where aX is the first unused function argument register.
• Return address (ra) is stored at the top of the stack.

Supported Instruction Set of the Interpreter*

RISC-V Instructions	Code
Arithmetic	AND, ANDI, OR, ORI, XOR, XORI
Logical	AND, ANDI, OR, ORI, XOR, XORI
Sets	SLT, SLTI, SLTU, SLTIU
Shifts	SRA, SRAI, SRL, SRLI, SLL, SLLI
Memory	LW, SW, LB, SB
PC	LUI, AUIPC
Jumps	JAL, JALR
Branches	BEQ, BNE, BLT, BGE, BLTU, BGEU

• Instruction specifications can be found in the RISC-V Instruction Set Manual.

* as of December 2019