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SADALP

Signed add and accumulate long pairwise.

Add pairs of adjacent signed integer values and accumulate the results into the overlapping double-width elements of the destination vector.

313029282726252423222120191817161514131211109876543210
01000100size000100101PgZnZda
U

SADALP <Zda>.<T>, <Pg>/M, <Zn>.<Tb>

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

Assembler Symbols

<Zda>

Is the name of the second 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
<Pg>

Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.

<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

Operation

CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) mask = P[g]; bits(VL) operand_acc = Z[da]; bits(VL) operand_src = if) operand_src = AnyActiveElement(mask, esize) then Z[n] else Zeros(); [n]; bits(VL) result; for e = 0 to elements-1 if ElemP[mask, e, esize] == '0' then Elem[result, e, esize] = Elem[operand_acc, e, esize]; else integer element1 = SInt(Elem[operand_src, 2*e + 0, esize DIV 2]); integer element2 = SInt(Elem[operand_src, 2*e + 1, esize DIV 2]); bits(esize) sum = (element1 + element2)<esize-1:0>; Elem[result, e, esize] = Elem[operand_acc, e, esize] + sum; Z[da] = result;

Operational information

If PSTATE.DIT is 1:

This instruction might be immediately preceded in program order by a MOVPRFX instruction. The MOVPRFX instruction must conform to all of the following requirements, otherwise the behavior of the MOVPRFX and this instruction is unpredictable:


Internal version only: isa v32.13v32.12, AdvSIMD v29.05v29.04, pseudocode v2020-12v2020-09_xml, sve v2020-12v2020-09_rc2b ; Build timestamp: 2020-12-16T142020-09-30T19:4116

Copyright © 2010-2020 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

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