SQSHL (register) Signed saturating shift left (register) This instruction takes each element in the vector of the first source SIMD&FP register, shifts each element by a value from the least significant byte of the corresponding element of the second source SIMD&FP register, places the results in a vector, and writes the vector to the destination SIMD&FP register. If the shift value is positive, the operation is a left shift. Otherwise, it is a right shift. The results are truncated. For rounded results, see SQRSHL. If overflow occurs with any of the results, those results are saturated. If saturation occurs, the cumulative saturation bit FPSR.QC is set. 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. It has encodings from 2 classes: Scalar and Vector 0 1 0 1 1 1 1 0 1 0 1 0 0 1 1 SQSHL <V><d>, <V><n>, <V><m> if S == '0' && size != '11' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant boolean unsigned = FALSE; constant boolean rounding = FALSE; constant integer esize = 8 << UInt(size); constant integer datasize = esize; constant integer elements = 1; 0 0 0 1 1 1 0 1 0 1 0 0 1 1 SQSHL <Vd>.<T>, <Vn>.<T>, <Vm>.<T> if size:Q == '110' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant boolean unsigned = FALSE; constant boolean rounding = FALSE; constant integer esize = 8 << UInt(size); constant integer datasize = 64 << UInt(Q); constant integer elements = datasize DIV esize; <V> Is a width specifier, size <V> 00 B 01 H 10 S 11 D <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. <m> Is the number of the second SIMD&FP source register, encoded in the "Rm" field. <Vd> Is the name of the SIMD&FP destination register, encoded in the "Rd" field. <T> Is an arrangement specifier, size Q <T> 00 0 8B 00 1 16B 01 0 4H 01 1 8H 10 0 2S 10 1 4S 11 0 RESERVED 11 1 2D <Vn> Is the name of the first SIMD&FP source register, encoded in the "Rn" field. <Vm> Is the name of the second SIMD&FP source register, encoded in the "Rm" field. CheckFPAdvSIMDEnabled64(); constant bits(datasize) operand1 = V[n, datasize]; constant bits(datasize) operand2 = V[m, datasize]; bits(datasize) result; boolean sat; for e = 0 to elements-1 integer element = SInt(Elem[operand1, e, esize]); integer shift = SInt(Elem[operand2, e, esize]<7:0>); if shift >= 0 then // left shift element = element << shift; else // right shift shift = -shift; element = RShr(element, shift, rounding); (Elem[result, e, esize], sat) = SatQ(element, esize, unsigned); if sat then FPSR.QC = '1'; V[d, datasize] = result;