public override bool Execute(Instruction instruction, InstructionPayload payload)
{
/*
* # RV64M
* mulw rd rs1 rs2 31..25=1 14..12=0 6..2=0x0E 1..0=3
* divw rd rs1 rs2 31..25=1 14..12=4 6..2=0x0E 1..0=3
* divuw rd rs1 rs2 31..25=1 14..12=5 6..2=0x0E 1..0=3
* remw rd rs1 rs2 31..25=1 14..12=6 6..2=0x0E 1..0=3
* remuw rd rs1 rs2 31..25=1 14..12=7 6..2=0x0E 1..0=3
*
*/
if (payload.Funct7 != 0x01)
{
throw new RiscVSimException("Invalid F7 Coding for RV64M opcode detected!");
}
var rd = payload.Rd;
var rs1Coding = Register.ReadBlock(payload.Rs1);
var rs1CodingLower = rs1Coding.Take(4);
var rs2Coding = Register.ReadBlock(payload.Rs2);
var rs2CodingLower = rs2Coding.Take(4);
switch (payload.Funct3)
{
// mulw
case 0:
multiplier.ExecuteMulw(rd, rs1CodingLower, rs2CodingLower);
break;
case 4:
case 5:
divider.Divw(rd, rs1CodingLower, rs2CodingLower);
break;
case 6:
case 7:
divider.Remw(rd, rs1CodingLower, rs2CodingLower);
break;
// Error
default:
throw new OpCodeNotSupportedException(String.Format("OpCode = {0}, Funct3 = {1}", instruction.OpCode, payload.Funct3));
}
return(true);
}