SHL Shift left (immediate) This instruction reads each value from a vector, left shifts each result by an immediate value, writes the final result to a vector, and writes the vector to the destination SIMD&FP register. Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped. If PSTATE.DIT is 1: The execution time of this instruction is independent of: The values of the data supplied in any of its registers. The values of the NZCV flags. The response of this instruction to asynchronous exceptions does not vary based on: The values of the data supplied in any of its registers. The values of the NZCV flags. It has encodings from 2 classes: Scalar and Vector 0 1 0 1 1 1 1 1 0 1 x x x 0 1 0 1 0 1 SHL D<d>, D<n>, #<shift> if immh<3> != '1' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 8 << 3; constant integer datasize = esize; constant integer elements = 1; constant integer shift = UInt(immh:immb) - esize; 0 0 0 1 1 1 1 0 != 0000 0 1 0 1 0 1 SHL <Vd>.<T>, <Vn>.<T>, #<shift> if immh == '0000' then SEE(asimdimm); if immh<3>:Q == '10' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 8 << HighestSetBitNZ(immh); constant integer datasize = 64 << UInt(Q); constant integer elements = datasize DIV esize; constant integer shift = UInt(immh:immb) - esize; <d> Is the number of the SIMD&FP destination register, in the "Rd" field. <n> Is the number of the first SIMD&FP source register, encoded in the "Rn" field. <shift> For the scalar variant: is the left shift amount, in the range 0 to 63, encoded as UInt("immh:immb") - 64. <shift> For the vector variant: is the left shift amount, in the range 0 to the element width in bits minus 1, immh <shift> 0001 UInt(immh:immb) - 8 001x UInt(immh:immb) - 16 01xx UInt(immh:immb) - 32 1xxx UInt(immh:immb) - 64 <Vd> Is the name of the SIMD&FP destination register, encoded in the "Rd" field. <T> Is an arrangement specifier, immh Q <T> 0001 0 8B 0001 1 16B 001x 0 4H 001x 1 8H 01xx 0 2S 01xx 1 4S 1xxx 0 RESERVED 1xxx 1 2D <Vn> Is the name of the SIMD&FP source register, encoded in the "Rn" field. CheckFPAdvSIMDEnabled64(); constant bits(datasize) operand = V[n, datasize]; bits(datasize) result; for e = 0 to elements-1 Elem[result, e, esize] = LSL(Elem[operand, e, esize], shift); V[d, datasize] = result;