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PTEST

Set condition flags for predicate.

Sets the First (N), None (Z), !Last (C) condition flags based on the predicate source register, and the V flag to zero.

313029282726252423222120191817161514131211109876543210
001001010101000011Pg0Pn00000

SVE

PTEST <Pg>, <Pn>.B

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

Assembler Symbols

<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.

Operation

CheckSVEEnabled(); bits(PL) mask = P[g]; bits(PL) result = P[n]; PSTATE.<N,Z,C,V> = PredTest(mask, result, esize);

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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