slli
Shift left logical immediate
Shift the value in xs1 left by shamt, and store the result in xd
| This instruction must have data-independent timing when extension Zkt is enabled. |
Decode Variables
-
RV32
-
RV64
Bits<5> shamt = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];Bits<6> shamt = $encoding[25:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];Execution
-
IDL
-
Sail
X[xd] = X[xs1] << shamt;{
let xs1_val = X(xs1);
/* the decoder guaxd should ensure that shamt[5] = 0 for RV32 */
let result : xlenbits = match op {
RISCV_SLLI => if sizeof(xlen) == 32
then xs1_val << shamt[4..0]
else xs1_val << shamt,
RISCV_SRLI => if sizeof(xlen) == 32
then xs1_val >> shamt[4..0]
else xs1_val >> shamt,
RISCV_SRAI => if sizeof(xlen) == 32
then shift_right_arith32(xs1_val, shamt[4..0])
else shift_right_arith64(xs1_val, shamt)
};
X(xd) = result;
RETIRE_SUCCESS
}