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UMLALB (vectors)

Unsigned multiply-add long to accumulator (bottom).

Multiply the corresponding even-numbered unsigned elements of the first and second source vectors and destructively add to the overlapping double-width elements of the addend vector. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
01000100size0Zm010010ZnZda

SVE2

UMLALB <Zda>.<T>, <Zn>.<Tb>, <Zm>.<Tb>

if !HaveSVE2() then UNDEFINED; if size == '00' then UNDEFINED; integer esize = 8 << UInt(size); integer n = UInt(Zn); integer m = UInt(Zm); integer da = UInt(Zda);

Assembler Symbols

<Zda>

Is the name of the third source and destination scalable vector register, encoded in the "Zda" field.

<T> Is the size specifier, encoded in size:
size<T>
00RESERVED
01H
10S
11D
<Zn>

Is the name of the first source scalable vector register, encoded in the "Zn" field.

<Tb> Is the size specifier, encoded in size:
size<Tb>
00RESERVED
01B
10H
11S
<Zm>

Is the name of the second source scalable vector register, encoded in the "Zm" field.

Operation

CheckSVEEnabledCheckSVEEnabled(); integer elements = VL DIV esize; bits(VL) operand1 = Z[n]; bits(VL) operand2 = Z[m]; bits(VL) result = Z[da]; for e = 0 to elements-1 integer element1 =(); integer elements = VL DIV esize; bits(VL) operand1 = Z[n]; bits(VL) operand2 = Z[m]; bits(VL) result = Z[da]; for e = 0 to elements-1 integer element1 = UInt(Elem[operand1, 2*e + 0, esize DIV 2]); integer element2 = UInt(Elem[operand2, 2*e + 0, esize DIV 2]); bits(esize) product = (element1 * element2)<esize-1:0>; integer element3 = UInt(Elem[result, e, esize] =[result, e, esize]); integer res = element3 + element1 * element2; Elem[result, e, esize] = res<esize-1:0>; Z[result, e, esize] + product; Z[da] = result;[da] = result;

Operational information

If PSTATE.DIT is 1:

This instruction might be immediately preceded in program order by a MOVPRFX instruction.instruction Thethat conforms to all of the following requirements, otherwise the behavior of either or both instructions is MOVPRFXunpredictable instruction must conform to all of the following requirements, otherwise the behavior of the:

The MOVPRFX and this instruction is unpredictableinstructions that can be used with this instruction are as follows:


Internal version only: isa v31.05bv31.04, AdvSIMD v29.02, pseudocode v2019-12_rc3_1v2019-09_rc2_1, sve v2019-12_rc3v2019-09_rc3 ; Build timestamp: 2019-12-13T112019-09-27T17:0228

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