SHRNB Shift right narrow by immediate (bottom) Shift each unsigned integer value in the source vector elements right by an immediate value, and place the truncated results in the even-numbered half-width destination elements, while setting the odd-numbered elements to zero. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. This instruction is unpredicated. Green False True 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 0 SHRNB <Zd>.<T>, <Zn>.<Tb>, #<const> if !IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant bits(3) tsize = tszh:tszl; if tsize == '000' then UNDEFINED; constant integer esize = 8 << HighestSetBit(tsize); constant integer n = UInt(Zn); constant integer d = UInt(Zd); constant integer shift = (2 * esize) - UInt(tsize:imm3); <Zd> Is the name of the destination scalable vector register, encoded in the "Zd" field. <T> Is the size specifier, tszh tszl <T> 0 00 RESERVED 0 01 B 0 1x H 1 xx S <Zn> Is the name of the source scalable vector register, encoded in the "Zn" field. <Tb> Is the size specifier, tszh tszl <Tb> 0 00 RESERVED 0 01 H 0 1x S 1 xx D <const> Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tszh:tszl:imm3". CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV (2 * esize); constant bits(VL) operand = Z[n, VL]; bits(VL) result; for e = 0 to elements-1 constant bits(2*esize) element = Elem[operand, e, 2*esize]; constant integer res = UInt(element) >> shift; Elem[result, 2*e + 0, esize] = res<esize-1:0>; Elem[result, 2*e + 1, esize] = Zeros(esize); Z[d, VL] = result;