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USUBWT

Unsigned subtract wide (top).

Subtract the odd-numbered unsigned elements of the second source vector from the overlapping double-width elements of the first source vector and place the results in the corresponding double-width elements of the destination vector. This instruction is unpredicated. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
01000101size0Zm010111ZnZd

SVE2

USUBWT <Zd>.<T>, <Zn>.<T>, <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 d = UInt(Zd);

Assembler Symbols

<Zd>

Is the name of the destination scalable vector register, encoded in the "Zd" 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.

<Zm>

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

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

Operation

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

Operational information

If PSTATE.DIT is 1:


Internal version only: isa v30.44v30.42, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2future-20190403, sve v2019-06_rc4v8.5-00bet10_rc5 ; Build timestamp: 2019-06-26T222019-04-17T09:0458

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

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