COMPACT

Shuffle active elements of vector to the right and fill with zero.

Read the active elements from the source vector and pack them into the lowest-numbered elements of the destination vector. Then set any remaining elements of the destination vector to zero.

313029282726252423222120191817161514131211109876543210
00000101size100001100PgZnZd

COMPACT <Zd>.<T>, <Pg>, <Zn>.<T>

if !HaveSVE() then UNDEFINED; if size == '0x' then UNDEFINED; integer esize = 8 << UInt(size); integer g = UInt(Pg); integer n = UInt(Zn); 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<0>:
size<0> <T>
0 S
1 D
<Pg>

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

<Zn>

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

Operation

CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) mask = P[g]; bits(VL) operand1 = Z[n]; bits(VL) result; integer x = 0; for e = 0 to elements-1 Elem[result, e, esize] = Zeros(); if ElemP[mask, e, esize] == '1' then bits(esize) element = Elem[operand1, e, esize]; Elem[result, x, esize] = element; x = x + 1; Z[d] = result;


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

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