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UMLSLT (vectors)

Unsigned multiply-subtract long from accumulator (top).

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

313029282726252423222120191817161514131211109876543210
01000100size0Zm010111ZnZda
SUT

SVE2

UMLSLT <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

CheckSVEEnabled(); 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 + 1, esize DIV 2]); integer element2 = UInt(Elem[operand2, 2*e + 1, esize DIV 2]); bits(esize) product = (element1 * element2)<esize-1:0>; Elem[result, e, esize] = Elem[result, e, esize] - product; 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 v32.03v31.05b, AdvSIMD v29.02, pseudocode v2020-03v2019-12_rc3_1, sve v2020-03_rc1v2019-12_rc3 ; Build timestamp: 2020-04-15T132019-12-13T11:3302

Copyright © 2010-20202010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

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