LD4B (scalar plus scalar) Contiguous load four-byte structures to four vectors (scalar index) Contiguous load four-byte structures, each to the same element number in four vector registers from the memory address generated by a 64-bit scalar base and a 64-bit scalar index register and added to the base address. After each structure access the index value is incremented by four. The index register is not updated by the instruction. Each predicate element applies to the same element number in each of the four vector registers, or equivalently to the four consecutive bytes in memory which make up each structure. Inactive elements will not cause a read from Device memory or signal a fault, and the corresponding element is set to zero in each of the four destination vector registers. Green True True True 1 0 1 0 0 1 0 0 0 1 1 1 1 0 LD4B { <Zt1>.B, <Zt2>.B, <Zt3>.B, <Zt4>.B }, <Pg>/Z, [<Xn|SP>, <Xm>] if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; if Rm == '11111' then UNDEFINED; constant integer t = UInt(Zt); constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant integer g = UInt(Pg); constant integer esize = 8; constant integer nreg = 4; <Zt1> Is the name of the first scalable vector register to be transferred, encoded in the "Zt" field. <Zt2> Is the name of the second scalable vector register to be transferred, encoded as "Zt" plus 1 modulo 32. <Zt3> Is the name of the third scalable vector register to be transferred, encoded as "Zt" plus 2 modulo 32. <Zt4> Is the name of the fourth scalable vector register to be transferred, encoded as "Zt" plus 3 modulo 32. <Pg> Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. <Xn|SP> Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. <Xm> Is the 64-bit name of the general-purpose offset register, encoded in the "Rm" field. CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; bits(64) base; constant bits(PL) mask = P[g, PL]; bits(64) offset; bits(64) addr; constant integer mbytes = esize DIV 8; array [0..3] of bits(VL) values; constant boolean contiguous = TRUE; constant boolean nontemporal = FALSE; constant boolean tagchecked = TRUE; constant AccessDescriptor accdesc = CreateAccDescSVE(MemOp_LOAD, nontemporal, contiguous, tagchecked); if !AnyActiveElement(mask, esize) then if n == 31 && ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE) then CheckSPAlignment(); else if n == 31 then CheckSPAlignment(); base = if n == 31 then SP[] else X[n, 64]; offset = X[m, 64]; addr = AddressAdd(base, UInt(offset) * mbytes, accdesc); for e = 0 to elements-1 for r = 0 to nreg-1 if ActivePredicateElement(mask, e, esize) then Elem[values[r], e, esize] = Mem[addr, mbytes, accdesc]; else Elem[values[r], e, esize] = Zeros(esize); addr = AddressIncrement(addr, mbytes, accdesc); for r = 0 to nreg-1 Z[(t+r) MOD 32, VL] = values[r];