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221 lines
9.7 KiB
XML
221 lines
9.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet type="text/xsl" encoding="UTF-8" href="iform.xsl" version="1.0"?>
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<!DOCTYPE instructionsection PUBLIC "-//ARM//DTD instructionsection //EN" "iform-p.dtd">
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<!-- Copyright (c) 2010-2022 Arm Limited or its affiliates. All rights reserved. -->
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<!-- This document is Non-Confidential. This document may only be used and distributed in accordance with the terms of the agreement entered into by Arm and the party that Arm delivered this document to. -->
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<instructionsection id="zero_za1_ri" title="ZERO (single-vector)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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</docvars>
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<heading>ZERO (single-vector)</heading>
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<desc>
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<brief>Zero ZA single-vector groups</brief>
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<description>
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<para>The instruction zeroes two or four ZA single-vector groups. The vector numbers forming the single-vector group within each half or each quarter of the ZA array are selected by the sum of the vector select register and immediate offset, modulo half or quarter the number of ZA array vectors.</para>
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<para>The <arm-defined-word>vector group</arm-defined-word> symbol, <syntax>VGx2</syntax> or <syntax>VGx4</syntax>, indicates that the ZA operand consists of two or four ZA single-vector groups respectively.</para>
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</description>
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<status>Amber</status>
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<sm_policy>SM_1_only</sm_policy>
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</desc>
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<alias_list howmany="0"></alias_list>
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<classes>
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<classesintro count="2">
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<txt>It has encodings from 2 classes:</txt>
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<a href="#iclass_sme_vgx2_single">Two ZA single-vectors</a>
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<txt> and </txt>
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<a href="#iclass_sme_vgx4_single">Four ZA single-vectors</a>
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</classesintro>
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<iclass name="Two ZA single-vectors" oneof="2" id="iclass_sme_vgx2_single" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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<docvar key="sme-multireg" value="sme-vgx2-single" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<arch_variants>
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<arch_variant name="FEAT_SME2p1" feature="FEAT_SME2p1" />
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</arch_variants>
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<regdiagram form="32" psname="ZERO-ZA1.RI-2">
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<box hibit="31" width="2" settings="2">
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<c>1</c>
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<c>1</c>
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</box>
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<box hibit="29" width="12" settings="12">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>1</c>
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<c>1</c>
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</box>
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<box hibit="17" width="2" name="opc<2:1>" settings="2">
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="15" name="opc<0>" settings="1">
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<c>0</c>
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</box>
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<box hibit="14" width="2" name="Rv" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="12" width="3" settings="3">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="9" width="6" settings="6">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="3" settings="1">
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<c>0</c>
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</box>
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<box hibit="2" width="3" name="off3" usename="1">
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<c colspan="3"></c>
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</box>
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</regdiagram>
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<encoding name="zero_za1_ri_2" oneofinclass="1" oneof="2" label="">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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<docvar key="sme-multireg" value="sme-vgx2-single" />
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</docvars>
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<asmtemplate><text>ZERO ZA.D[</text><a link="sa_wv" hover="32-bit vector select register W8-W11 (field "Rv")"><Wv></a><text>, </text><a link="sa_offs" hover="Vector select offset [0-7] (field "off3")"><offs></a><text>, VGx2]</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="ZERO-ZA1.RI-2" mylink="ZERO-ZA1.RI-2" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME2p1.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME2p1()">HaveSME2p1</a>() then UNDEFINED;
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integer v = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>('010':Rv);
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integer offset = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(off3);
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constant integer ngrp = 2;</pstext>
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</ps>
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</ps_section>
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</iclass>
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<iclass name="Four ZA single-vectors" oneof="2" id="iclass_sme_vgx4_single" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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<docvar key="sme-multireg" value="sme-vgx4-single" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<arch_variants>
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<arch_variant name="FEAT_SME2p1" feature="FEAT_SME2p1" />
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</arch_variants>
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<regdiagram form="32" psname="ZERO-ZA1.RI-4">
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<box hibit="31" width="2" settings="2">
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<c>1</c>
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<c>1</c>
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</box>
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<box hibit="29" width="12" settings="12">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>1</c>
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<c>1</c>
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</box>
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<box hibit="17" width="2" name="opc<2:1>" settings="2">
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<c>1</c>
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<c>0</c>
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</box>
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<box hibit="15" name="opc<0>" settings="1">
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<c>0</c>
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</box>
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<box hibit="14" width="2" name="Rv" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="12" width="3" settings="3">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="9" width="6" settings="6">
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="3" settings="1">
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<c>0</c>
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</box>
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<box hibit="2" width="3" name="off3" usename="1">
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<c colspan="3"></c>
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</box>
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</regdiagram>
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<encoding name="zero_za1_ri_4" oneofinclass="1" oneof="2" label="">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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<docvar key="sme-multireg" value="sme-vgx4-single" />
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</docvars>
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<asmtemplate><text>ZERO ZA.D[</text><a link="sa_wv" hover="32-bit vector select register W8-W11 (field "Rv")"><Wv></a><text>, </text><a link="sa_offs" hover="Vector select offset [0-7] (field "off3")"><offs></a><text>, VGx4]</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="ZERO-ZA1.RI-4" mylink="ZERO-ZA1.RI-4" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME2p1.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME2p1()">HaveSME2p1</a>() then UNDEFINED;
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integer v = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>('010':Rv);
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integer offset = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(off3);
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constant integer ngrp = 4;</pstext>
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</ps>
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</ps_section>
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</iclass>
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</classes>
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<explanations scope="all">
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<explanation enclist="zero_za1_ri_2, zero_za1_ri_4" symboldefcount="1">
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<symbol link="sa_wv"><Wv></symbol>
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<account encodedin="Rv">
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<intro>
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<para>Is the 32-bit name of the vector select register W8-W11, encoded in the "Rv" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="zero_za1_ri_2, zero_za1_ri_4" symboldefcount="1">
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<symbol link="sa_offs"><offs></symbol>
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<account encodedin="off3">
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<intro>
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<para>Is the vector select offset, in the range 0 to 7, encoded in the "off3" field.</para>
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</intro>
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</account>
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</explanation>
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</explanations>
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<ps_section howmany="1">
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<ps name="ZERO-ZA1.RI-2" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckStreamingSVEAndZAEnabled.0" file="shared_pseudocode.xml" hover="function: CheckStreamingSVEAndZAEnabled()">CheckStreamingSVEAndZAEnabled</a>();
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constant integer VL = <a link="impl-aarch64.CurrentVL.read.none" file="shared_pseudocode.xml" hover="accessor: integer CurrentVL">CurrentVL</a>;
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integer vectors = VL DIV 8;
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integer vstride = vectors DIV ngrp;
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bits(32) vbase = <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[v, 32];
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integer vec = (<a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(vbase) + offset) MOD vstride;
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for r = 0 to ngrp-1
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<a link="impl-aarch64.ZAvector.write.2" file="shared_pseudocode.xml" hover="accessor: ZAvector[integer index, integer width] = bits(width) value">ZAvector</a>[vec, VL] = <a link="impl-shared.Zeros.1" file="shared_pseudocode.xml" hover="function: bits(N) Zeros(integer N)">Zeros</a>(VL);
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vec = vec + vstride;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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