sh3add
Shift left by 3 and add
Shifts rs1 to the left by 3 places and adds it to rs2.
Decode Variables
Bits<5> rs2 = $encoding[24:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];Execution
-
IDL
-
Sail
if (implemented?(ExtensionName::B) && (misa.B == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
X[rd] = X[rs2] + (X[rs1] << 3);{
let rs1_val = X(rs1);
let rs2_val = X(rs2);
let shamt : bits(2) = match op {
RISCV_SH1ADD => 0b01,
RISCV_SH2ADD => 0b10,
RISCV_SH3ADD => 0b11
};
let result : xlenbits = (rs1_val << shamt) + rs2_val;
X(rd) = result;
RETIRE_SUCCESS
}