SQXTUN, SQXTUN2 Signed saturating extract unsigned narrow This instruction reads each signed integer value in the vector of the source SIMD&FP register, saturates the value to an unsigned integer value that is half the original width, places the result into a vector, and writes the vector to the lower or upper half of the destination SIMD&FP register. The destination vector elements are half as long as the source vector elements. If saturation occurs, the cumulative saturation bit FPSR.QC is set. The SQXTUN instruction writes the vector to the lower half of the destination register and clears the upper half. The SQXTUN2 instruction writes the vector to the upper half of the destination register without affecting the other bits of the 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. It has encodings from 2 classes: Scalar and Vector 0 1 1 1 1 1 1 0 1 0 0 0 0 1 0 0 1 0 1 0 SQXTUN <Vb><d>, <Va><n> if size == '11' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 8 << UInt(size); constant integer datasize = esize; constant integer part = 0; constant integer elements = 1; 0 1 0 1 1 1 0 1 0 0 0 0 1 0 0 1 0 1 0 SQXTUN{2} <Vd>.<Tb>, <Vn>.<Ta> if size == '11' then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 8 << UInt(size); constant integer datasize = 64; constant integer part = UInt(Q); constant integer elements = datasize DIV esize; <Vb> Is the destination width specifier, size <Vb> 00 B 01 H 10 S 11 RESERVED <d> Is the number of the SIMD&FP destination register, encoded in the "Rd" field. <Va> Is the source width specifier, size <Va> 00 H 01 S 10 D 11 RESERVED <n> Is the number of the SIMD&FP source register, encoded in the "Rn" field. 2 Is the second and upper half specifier. If present it causes the operation to be performed on the upper 64 bits of the registers holding the narrower elements, and is Q 2 0 [absent] 1 [present] <Vd> Is the name of the SIMD&FP destination register, encoded in the "Rd" field. <Tb> Is an arrangement specifier, size Q <Tb> 00 0 8B 00 1 16B 01 0 4H 01 1 8H 10 0 2S 10 1 4S 11 x RESERVED <Vn> Is the name of the SIMD&FP source register, encoded in the "Rn" field. <Ta> Is an arrangement specifier, size <Ta> 00 8H 01 4S 10 2D 11 RESERVED CheckFPAdvSIMDEnabled64(); constant bits(2*datasize) operand = V[n, 2*datasize]; bits(datasize) result; bits(2*esize) element; boolean sat; for e = 0 to elements-1 element = Elem[operand, e, 2*esize]; (Elem[result, e, esize], sat) = UnsignedSatQ(SInt(element), esize); if sat then FPSR.QC = '1'; Vpart[d, part, datasize] = result;