Contiguous load signed bytes to vector (immediate index)
Contiguous load of signed bytes to elements of a vector register from the memory address generated by a 64-bit scalar base and immediate index in the range -8 to 7 which is multiplied by the vector's in-memory size, irrespective of predication, and added to the base address. Inactive elements will not not cause a read from Device memory or signal a fault, and are set to zero in the destination vector.
It has encodings from 3 classes: 16-bit element , 32-bit element and 64-bit element
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | imm4 | 1 | 0 | 1 | Pg | Rn | Zt | |||||||||||||
| dtype<3:1> | dtype<0> | ||||||||||||||||||||||||||||||
if !HaveSVE() && !HaveSME() then UNDEFINED; integer t = UInt(Zt); integer n = UInt(Rn); integer g = UInt(Pg); integer esize = 16; integer msize = 8; boolean unsigned = FALSE; integer offset = SInt(imm4);
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | imm4 | 1 | 0 | 1 | Pg | Rn | Zt | |||||||||||||
| dtype<3:1> | dtype<0> | ||||||||||||||||||||||||||||||
if !HaveSVE() && !HaveSME() then UNDEFINED; integer t = UInt(Zt); integer n = UInt(Rn); integer g = UInt(Pg); integer esize = 32; integer msize = 8; boolean unsigned = FALSE; integer offset = SInt(imm4);
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | imm4 | 1 | 0 | 1 | Pg | Rn | Zt | |||||||||||||
| dtype<3:1> | dtype<0> | ||||||||||||||||||||||||||||||
if !HaveSVE() && !HaveSME() then UNDEFINED; integer t = UInt(Zt); integer n = UInt(Rn); integer g = UInt(Pg); integer esize = 64; integer msize = 8; boolean unsigned = FALSE; integer offset = SInt(imm4);
| <Zt> |
Is the name of the scalable vector register to be transferred, encoded in the "Zt" field. |
| <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. |
| <imm> |
Is the optional signed immediate vector offset, in the range -8 to 7, defaulting to 0, encoded in the "imm4" field. |
CheckSVEEnabled(); integer elements = VL DIV esize; bits(64) base; bits(PL) mask = P[g]; bits(VL) result; bits(msize) data; constant integer mbytes = msize DIV 8; if HaveMTEExt() then SetTagCheckedInstruction(n != 31); 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]; for e = 0 to elements-1 if ElemP[mask, e, esize] == '1' then integer eoff = (offset * elements) + e; bits(64) addr = base + eoff * mbytes; data = Mem[addr, mbytes, AccType_NORMAL]; Elem[result, e, esize] = Extend(data, esize, unsigned); else Elem[result, e, esize] = Zeros(); Z[t] = result;
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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