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https://github.com/pound-emu/ballistic.git
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346 lines
16 KiB
XML
346 lines
16 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_za2_ri" title="ZERO (double-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 (double-vector)</heading>
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<desc>
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<brief>Zero ZA double-vector groups</brief>
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<description>
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<para>The instruction zeroes one, two, or four ZA double-vector groups. The lowest of the two consecutive vector numbers forming the double-vector group within all, each half, or each quarter of the ZA array are selected by the sum of the vector select register and immediate offset, modulo all, 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 double-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="3">
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<txt>It has encodings from 3 classes:</txt>
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<a href="#iclass_sme_vgx1_double">One ZA double-vector</a>
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<txt>, </txt>
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<a href="#iclass_sme_vgx2_double">Two ZA double-vectors</a>
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<txt> and </txt>
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<a href="#iclass_sme_vgx4_double">Four ZA double-vectors</a>
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</classesintro>
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<iclass name="One ZA double-vector" oneof="3" id="iclass_sme_vgx1_double" 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-vgx1-double" />
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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-ZA2.RI-1">
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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>1</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_za2_ri_1" oneofinclass="1" oneof="3" 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-vgx1-double" />
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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_offsf" hover="Vector select offset, pointing to first of two consecutive vectors, encoded as "off3" field times 2 (field off3)"><offsf></a><text>:</text><a link="sa_offsl" hover="Vector select offset, pointing to last of two consecutive vectors, encoded as "off3" field times 2 plus 1 (field off3)"><offsl></a><text>]</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="ZERO-ZA2.RI-1" mylink="ZERO-ZA2.RI-1" 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:'0');
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constant integer ngrp = 1;
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constant integer nvec = 2;</pstext>
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</ps>
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</ps_section>
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</iclass>
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<iclass name="Two ZA double-vectors" oneof="3" id="iclass_sme_vgx2_double" 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-double" />
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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-ZA2.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="10" settings="10">
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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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</box>
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<box hibit="19" 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="17" width="2" name="opc<2:1>" settings="2">
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<c>0</c>
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<c>1</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" settings="1">
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<c>0</c>
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</box>
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<box hibit="1" width="2" name="off2" usename="1">
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<c colspan="2"></c>
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</box>
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</regdiagram>
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<encoding name="zero_za2_ri_2" oneofinclass="1" oneof="3" 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-double" />
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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_offsf_1" hover="Vector select offset, pointing to first of two consecutive vectors, encoded as "off2" field times 2 (field off2)"><offsf></a><text>:</text><a link="sa_offsl_1" hover="Vector select offset, pointing to last of two consecutive vectors, encoded as "off2" field times 2 plus 1 (field off2)"><offsl></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-ZA2.RI-2" mylink="ZERO-ZA2.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>(off2:'0');
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constant integer ngrp = 2;
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constant integer nvec = 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 double-vectors" oneof="3" id="iclass_sme_vgx4_double" 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-double" />
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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-ZA2.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="10" settings="10">
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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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</box>
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<box hibit="19" 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="17" width="2" name="opc<2:1>" settings="2">
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<c>0</c>
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<c>1</c>
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</box>
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<box hibit="15" name="opc<0>" settings="1">
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<c>1</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" settings="1">
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<c>0</c>
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</box>
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<box hibit="1" width="2" name="off2" usename="1">
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<c colspan="2"></c>
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</box>
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</regdiagram>
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<encoding name="zero_za2_ri_4" oneofinclass="1" oneof="3" 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-double" />
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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_offsf_1" hover="Vector select offset, pointing to first of two consecutive vectors, encoded as "off2" field times 2 (field off2)"><offsf></a><text>:</text><a link="sa_offsl_1" hover="Vector select offset, pointing to last of two consecutive vectors, encoded as "off2" field times 2 plus 1 (field off2)"><offsl></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-ZA2.RI-4" mylink="ZERO-ZA2.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>(off2:'0');
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constant integer ngrp = 4;
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constant integer nvec = 2;</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_za2_ri_1, zero_za2_ri_2, zero_za2_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_za2_ri_1" symboldefcount="1">
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<symbol link="sa_offsf"><offsf></symbol>
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<account encodedin="off3">
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<docvars>
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<docvar key="sme-multireg" value="sme-vgx1-double" />
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</docvars>
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<intro>
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<para>For the one ZA double-vector variant: is the vector select offset, pointing to first of two consecutive vectors, encoded as "off3" field times 2.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="zero_za2_ri_2, zero_za2_ri_4" symboldefcount="2">
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<symbol link="sa_offsf_1"><offsf></symbol>
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<account encodedin="off2">
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<intro>
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<para>For the four ZA double-vectors and two ZA double-vectors variant: is the vector select offset, pointing to first of two consecutive vectors, encoded as "off2" field times 2.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="zero_za2_ri_1" symboldefcount="1">
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<symbol link="sa_offsl"><offsl></symbol>
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<account encodedin="off3">
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<docvars>
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<docvar key="sme-multireg" value="sme-vgx1-double" />
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</docvars>
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<intro>
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<para>For the one ZA double-vector variant: is the vector select offset, pointing to last of two consecutive vectors, encoded as "off3" field times 2 plus 1.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="zero_za2_ri_2, zero_za2_ri_4" symboldefcount="2">
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<symbol link="sa_offsl_1"><offsl></symbol>
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<account encodedin="off2">
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<intro>
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<para>For the four ZA double-vectors and two ZA double-vectors variant: is the vector select offset, pointing to last of two consecutive vectors, encoded as "off2" field times 2 plus 1.</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-ZA2.RI-1" 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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vec = vec - (vec MOD nvec);
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for r = 0 to ngrp-1
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for i = 0 to nvec-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 + i, 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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