slli
Shift left logical immediate
This instruction is defined by:
-
I, version >= I@2.1.0
This instruction is included in the following profiles:
-
MockProfile 64-bit S-mode (Mandatory)
-
MockProfile 64-bit Unpriv (Mandatory)
-
RVA20S64 (Mandatory)
-
RVA20U64 (Mandatory)
-
RVA22S64 (Mandatory)
-
RVA22U64 (Mandatory)
-
RVA23S64 (Mandatory)
-
RVA23U64 (Mandatory)
-
RVB23S64 (Mandatory)
-
RVB23U64 (Mandatory)
-
RVI20U32 (Mandatory)
-
RVI20U64 (Mandatory)
Synopsis
This instruction must have data-independent timing when extension Zkt is enabled. |
Shift the value in xs1 left by shamt, and store the result in xd
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
}