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CNTP

.

Counts the number of active and true elements in the source predicate and places the scalar result in the destination general-purpose register. Inactive predicate elements are not counted.

Set scalar to count of true predicate elements.

Counts the number of active and true elements in the source predicate and places the scalar result in the destination general-purpose register. Inactive predicate elements are not counted.

313029282726252423222120191817161514131211109876543210
00100101size10000010Pg0PnRd

CNTP <Xd>, <Pg>, <Pn>.<T>

if !HaveSVE() then UNDEFINED; integer esize = 8 << UInt(size); integer g = UInt(Pg); integer n = UInt(Pn); integer d = UInt(Rd);

Assembler Symbols

<Xd>

Is the 64-bit name of the destination general-purpose register, encoded in the "Rd" field.

<Pg>

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

<Pn>

Is the name of the source scalable predicate register, encoded in the "Pn" field.

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

Is the size specifier, encoded in size:

size<T>
00B
01H
10S
11D

Operation

CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) mask = P[g]; bits(PL) operand = P[n]; bits(64) sum = Zeros(); for e = 0 to elements-1 if ElemP[mask, e, esize] == '1' && ElemP[operand, e, esize] == '1' then sum = sum + 1; X[d] = sum;


Internal version only: isa v32.13v32.12, AdvSIMD v29.05v29.04, pseudocode v2020-12v2020-09_xml, sve v2020-12v2020-09_rc3 ; Build timestamp: 2020-12-16T142020-11-18T17:1723

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

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