Multi-vector unsigned by signed integer multiply-add long-long by indexed element
This unsigned by signed integer multiply-add long-long instruction multiplies each unsigned 8-bit element in the one, two, or four first source vectors with each signed 8-bit indexed element of the second source vector, widens each product to 32-bits and destructively adds these values to the corresponding 32-bit elements of the ZA quad-vector groups.
The elements within the second source vector are specified using an immediate element index which selects the same element position within each 128-bit vector segment. The element index range is from 0 to one less than the number of elements per 128-bit segment, encoded in 4 bits. The lowest of the four consecutive vector numbers forming the quad-vector group within all of, each half of, or each quarter of the ZA array are selected by the sum of the vector select register and immediate offset, modulo all, half, or quarter the number of ZA array vectors.
The vector group symbol, VGx2 or VGx4, indicates that the ZA operand consists of two or four ZA quad-vector groups respectively. The vector group symbol is preferred for disassembly, but optional in assembler source code.
This instruction is unpredicated.
It has encodings from 3 classes: One ZA quad-vector , Two ZA quad-vectors and Four ZA quad-vectors
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 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | Zm | i4h | Rv | i4l | Zn | 0 | 0 | 1 | off2 | |||||||||||
U | S |
if !HaveSME2() then UNDEFINED; constant integer esize = 32; integer v = UInt('010':Rv); integer n = UInt(Zn); integer m = UInt('0':Zm); integer offset = UInt(off2:'00'); integer index = UInt(i4h:i4l); constant integer nreg = 1;
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 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | Zm | 0 | Rv | 0 | i4h | Zn | 1 | 0 | 0 | i4l | o1 | |||||||||
U | S |
if !HaveSME2() then UNDEFINED; constant integer esize = 32; integer v = UInt('010':Rv); integer n = UInt(Zn:'0'); integer m = UInt('0':Zm); integer offset = UInt(o1:'00'); integer index = UInt(i4h:i4l); constant integer nreg = 2;
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 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | Zm | 1 | Rv | 0 | i4h | Zn | 0 | 1 | 0 | 0 | i4l | o1 | ||||||||
U | S |
if !HaveSME2() then UNDEFINED; constant integer esize = 32; integer v = UInt('010':Rv); integer n = UInt(Zn:'00'); integer m = UInt('0':Zm); integer offset = UInt(o1:'00'); integer index = UInt(i4h:i4l); constant integer nreg = 4;
<Wv> |
Is the 32-bit name of the vector select register W8-W11, encoded in the "Rv" field. |
<Zn> |
Is the name of the first source scalable vector register, encoded in the "Zn" field. |
<Zn4> |
Is the name of the fourth scalable vector register of the first source multi-vector group, encoded as "Zn" times 4 plus 3. |
<Zn2> |
Is the name of the second scalable vector register of the first source multi-vector group, encoded as "Zn" times 2 plus 1. |
<Zm> |
Is the name of the second source scalable vector register Z0-Z15, encoded in the "Zm" field. |
<index> |
Is the element index, in the range 0 to 15, encoded in the "i4h:i4l" fields. |
CheckStreamingSVEAndZAEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV esize; integer vectors = VL DIV 8; integer vstride = vectors DIV nreg; integer eltspersegment = 128 DIV esize; bits(32) vbase = X[v, 32]; integer vec = (UInt(vbase) + offset) MOD vstride; bits(VL) result; vec = vec - (vec MOD 4); for r = 0 to nreg-1 bits(VL) operand1 = Z[n+r, VL]; bits(VL) operand2 = Z[m, VL]; for i = 0 to 3 bits(VL) operand3 = ZAvector[vec + i, VL]; for e = 0 to elements-1 integer segmentbase = e - (e MOD eltspersegment); integer s = 4 * segmentbase + index; integer element1 = UInt(Elem[operand1, 4 * e + i, esize DIV 4]); integer element2 = SInt(Elem[operand2, s, esize DIV 4]); bits(esize) product = (element1 * element2)<esize-1:0>; Elem[result, e, esize] = Elem[operand3, e, esize] + product; ZAvector[vec + i, VL] = result; vec = vec + vstride;
If PSTATE.DIT is 1:
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
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