slonik/specs/vld3_1.xml

926 lines
55 KiB
XML

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" encoding="UTF-8" href="iform.xsl" version="1.0"?>
<!DOCTYPE instructionsection PUBLIC "-//ARM//DTD instructionsection //EN" "iform-p.dtd">
<!-- Copyright (c) 2010-2022 Arm Limited or its affiliates. All rights reserved. -->
<!-- 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. -->
<instructionsection id="VLD3_1" title="VLD3 (single 3-element structure to one lane) -- AArch32" type="instruction">
<docvars>
<docvar key="instr-class" value="fpsimd" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<heading>VLD3 (single 3-element structure to one lane)</heading>
<desc>
<brief>
<para>Load single 3-element structure to one lane of three registers</para>
</brief>
<authored>
<para>Load single 3-element structure to one lane of three registers loads one 3-element structure from memory into corresponding elements of three registers. Elements of the registers that are not loaded are unchanged. For details of the addressing mode, see <xref linkend="Cjaefebe">Advanced SIMD addressing mode</xref>.</para>
<para>Depending on settings in the <xref linkend="AArch32.cpacr">CPACR</xref>, <xref linkend="AArch32.nsacr">NSACR</xref>, and <xref linkend="AArch32.hcptr">HCPTR</xref> registers, and the Security state and PE mode in which the instruction is executed, an attempt to execute the instruction might be <arm-defined-word>undefined</arm-defined-word>, or trapped to Hyp mode. For more information, see <xref linkend="CIHIDDFF">Enabling Advanced SIMD and floating-point support</xref>.</para>
</authored>
<encodingnotes>
<para>For more information about the <arm-defined-word>constrained unpredictable</arm-defined-word> behavior of this instruction, see <xref linkend="CJAEGDJC">Architectural Constraints on UNPREDICTABLE behaviors</xref>, and particularly <xref linkend="CEGBCJIB">VLD3 (single 3-element structure to one lane)</xref>.</para>
</encodingnotes>
<syntaxnotes>
<para>For more information about the variants of this instruction, see <xref linkend="Cjaefebe">Advanced SIMD addressing mode</xref>.</para>
<para>Alignment</para>
<para>Standard alignment rules apply, see <xref linkend="CHDIDCCI">Alignment support</xref>.</para>
</syntaxnotes>
</desc>
<operationalnotes>
<para>If CPSR.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored.</para>
</operationalnotes>
<alias_list howmany="0"></alias_list>
<classes>
<classesintro count="6">
<txt>It has encodings from the following instruction sets:</txt>
<txt> A32 (</txt>
<a href="#iclass_a1">A1</a>
<txt>, </txt>
<a href="#iclass_a2">A2</a>
<txt> and </txt>
<a href="#iclass_a3">A3</a>
<txt>)</txt>
<txt> and </txt>
<txt> T32 (</txt>
<a href="#iclass_t1">T1</a>
<txt>, </txt>
<a href="#iclass_t2">T2</a>
<txt> and </txt>
<a href="#iclass_t3">T3</a>
<txt>)</txt>
<txt>.</txt>
</classesintro>
<iclass name="A1" oneof="6" id="iclass_a1" no_encodings="3" isa="A32">
<docvars>
<docvar key="armarmheading" value="A1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="32" psname="aarch32/instrs/VLD3_1/T1A1_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>0</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_A1_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="A1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A1_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="A1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A1_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="A1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T1A1_A.txt" mylink="aarch32.instrs.VLD3_1.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;0&gt; != '0' then UNDEFINED;
ebytes = 1; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3:1&gt;); inc = 1;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="A1" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="A2" oneof="6" id="iclass_a2" no_encodings="3" isa="A32">
<docvars>
<docvar key="armarmheading" value="A2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="32" psname="aarch32/instrs/VLD3_1/T2A2_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>0</c>
<c>1</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_A2_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="A2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A2_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="A2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A2_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="A2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T2A2_A.txt" mylink="aarch32.instrs.VLD3_1.T2A2_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;0&gt; != '0' then UNDEFINED;
ebytes = 2; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3:2&gt;);
inc = if index_align&lt;1&gt; == '0' then 1 else 2;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="A2" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="A3" oneof="6" id="iclass_a3" no_encodings="3" isa="A32">
<docvars>
<docvar key="armarmheading" value="A3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="32" psname="aarch32/instrs/VLD3_1/T3A3_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_A3_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="A3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A3_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="A3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_A3_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="A3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T3A3_A.txt" mylink="aarch32.instrs.VLD3_1.T3A3_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;1:0&gt; != '00' then UNDEFINED;
ebytes = 4; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3&gt;);
inc = if index_align&lt;2&gt; == '0' then 1 else 2;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="A3" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="T1" oneof="6" id="iclass_t1" no_encodings="3" isa="T32">
<docvars>
<docvar key="armarmheading" value="T1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="16x2" psname="aarch32/instrs/VLD3_1/T1A1_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>0</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_T1_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="T1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T1_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="T1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T1_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="T1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T1A1_A.txt" mylink="aarch32.instrs.VLD3_1.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;0&gt; != '0' then UNDEFINED;
ebytes = 1; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3:1&gt;); inc = 1;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="T1" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="T2" oneof="6" id="iclass_t2" no_encodings="3" isa="T32">
<docvars>
<docvar key="armarmheading" value="T2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="16x2" psname="aarch32/instrs/VLD3_1/T2A2_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>0</c>
<c>1</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_T2_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="T2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T2_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="T2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T2_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="T2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T2A2_A.txt" mylink="aarch32.instrs.VLD3_1.T2A2_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;0&gt; != '0' then UNDEFINED;
ebytes = 2; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3:2&gt;);
inc = if index_align&lt;1&gt; == '0' then 1 else 2;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="T2" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="T3" oneof="6" id="iclass_t3" no_encodings="3" isa="T32">
<docvars>
<docvar key="armarmheading" value="T3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="16x2" psname="aarch32/instrs/VLD3_1/T3A3_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>0</c>
<c>1</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" name="L" settings="1">
<c>1</c>
</box>
<box hibit="20" settings="1">
<c>0</c>
</box>
<box hibit="19" width="4" name="Rn" usename="1">
<c colspan="4"></c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" name="size" usename="1" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="N" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="7" width="4" name="index_align" usename="1">
<c colspan="4"></c>
</box>
<box hibit="3" width="4" name="Rm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VLD3_1_T3_nowb" oneofinclass="3" oneof="18" label="Offset" bitdiffs="Rm == 1111">
<docvars>
<docvar key="address-form" value="base-plus-offset" />
<docvar key="armarmheading" value="T3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T3_posti" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm == 1101">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="armarmheading" value="T3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>]!</text></asmtemplate>
</encoding>
<encoding name="VLD3_1_T3_postr" oneofinclass="3" oneof="18" label="Post-indexed" bitdiffs="Rm != 11x1">
<docvars>
<docvar key="address-form" value="post-indexed" />
<docvar key="address-offset" value="reg-offset" />
<docvar key="armarmheading" value="T3" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VLD3" />
</docvars>
<box hibit="3" width="4" name="Rm">
<c>N</c>
<c>N</c>
<c></c>
<c>N</c>
</box>
<asmtemplate><text>VLD3</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.</text><a link="sa_size" hover="Data size (field &quot;size&quot;) [8,16,32]">&lt;size&gt;</a><text> </text><a link="sa_list" hover="List containing the 64-bit names of three SIMD&amp;FP registers holding element (field &quot;index_align&lt;0&gt;&quot;)">&lt;list&gt;</a><text>, [</text><a link="sa_rn" hover="General-purpose base register (field &quot;Rn&quot;)">&lt;Rn&gt;</a><text>], </text><a link="sa_rm" hover="General-purpose index register containing an offset applied after the access (field &quot;Rm&quot;)">&lt;Rm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/T3A3_A.txt" mylink="aarch32.instrs.VLD3_1.T3A3_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then SEE "VLD3 (single 3-element structure to all lanes)";
if index_align&lt;1:0&gt; != '00' then UNDEFINED;
ebytes = 4; index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(index_align&lt;3&gt;);
inc = if index_align&lt;2&gt; == '0' then 1 else 2;
d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); d2 = d + inc; d3 = d2 + inc; n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
wback = (m != 15); register_index = (m != 15 &amp;&amp; m != 13);
if n == 15 || d3 &gt; 31 then UNPREDICTABLE;</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="T3" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">d3 &gt; 31</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type constraint="Constraint_NOP" />
<cu_type>
<cu_type_text>One or more of the SIMD and floating-point registers are <arm-defined-word>unknown</arm-defined-word>. If the instruction specifies writeback, the base register becomes <arm-defined-word>unknown</arm-defined-word>. This behavior does not affect any general-purpose registers.</cu_type_text>
</cu_type>
</cu_case>
</constrained_unpredictables>
</iclass>
</classes>
<explanations scope="all">
<explanation enclist="VLD3_1_A1_nowb, VLD3_1_A2_nowb, VLD3_1_A3_nowb" symboldefcount="1">
<symbol link="sa_c_1">&lt;c&gt;</symbol>
<account encodedin="">
<docvars>
<docvar key="isa" value="A32" />
</docvars>
<intro>
<para>For encoding A1, A2 and A3: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>. This encoding must be unconditional.</para>
</intro>
</account>
</explanation>
<explanation enclist="VLD3_1_T1_nowb, VLD3_1_T2_nowb, VLD3_1_T3_nowb" symboldefcount="2">
<symbol link="sa_c">&lt;c&gt;</symbol>
<account encodedin="">
<docvars>
<docvar key="isa" value="T32" />
</docvars>
<intro>
<para>For encoding T1, T2 and T3: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
</intro>
</account>
</explanation>
<explanation enclist="VLD3_1_A1_nowb, VLD3_1_A2_nowb, VLD3_1_A3_nowb, VLD3_1_T1_nowb, VLD3_1_T2_nowb, VLD3_1_T3_nowb" symboldefcount="1">
<symbol link="sa_q">&lt;q&gt;</symbol>
<account encodedin="">
<intro>
<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
</intro>
</account>
</explanation>
<explanation enclist="VLD3_1_A1_nowb, VLD3_1_A2_nowb, VLD3_1_A3_nowb, VLD3_1_T1_nowb, VLD3_1_T2_nowb, VLD3_1_T3_nowb" symboldefcount="1">
<symbol link="sa_size">&lt;size&gt;</symbol>
<definition encodedin="size">
<intro>Is the data size, </intro>
<table class="valuetable">
<tgroup cols="2">
<thead>
<row>
<entry class="bitfield">size</entry>
<entry class="symbol">&lt;size&gt;</entry>
</row>
</thead>
<tbody>
<row>
<entry class="bitfield">00</entry>
<entry class="symbol">8</entry>
</row>
<row>
<entry class="bitfield">01</entry>
<entry class="symbol">16</entry>
</row>
<row>
<entry class="bitfield">10</entry>
<entry class="symbol">32</entry>
</row>
</tbody>
</tgroup>
</table>
</definition>
</explanation>
<explanation enclist="VLD3_1_A1_nowb, VLD3_1_A2_nowb, VLD3_1_A3_nowb, VLD3_1_T1_nowb, VLD3_1_T2_nowb, VLD3_1_T3_nowb" symboldefcount="1">
<symbol link="sa_list">&lt;list&gt;</symbol>
<account encodedin="index_align&lt;0&gt;">
<intro>
<para>Is a list containing the 64-bit names of the three SIMD&amp;FP registers holding the element.</para>
<para>The list must be one of:</para>
<list type="param">
<listitem>
<param><syntax>{ &lt;Dd&gt;[&lt;index&gt;], &lt;Dd+1&gt;[&lt;index&gt;], &lt;Dd+2&gt;[&lt;index&gt;] }</syntax></param><content>Single-spaced registers, encoded as "spacing" = <binarynumber>0</binarynumber>.</content>
</listitem>
<listitem>
<param><syntax>{ &lt;Dd&gt;[&lt;index&gt;], &lt;Dd+2&gt;[&lt;index&gt;], &lt;Dd+4&gt;[&lt;index&gt;] }</syntax></param><content>Double-spaced registers, encoded as "spacing" = <binarynumber>1</binarynumber>. Not permitted when <syntax>&lt;size&gt;</syntax> == 8.</content>
</listitem>
</list>
<para>The encoding of "spacing" depends on <syntax>&lt;size&gt;</syntax>:</para>
<list type="param">
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 8</param><content>"spacing" is encoded in the "index_align&lt;0&gt;" field.</content>
</listitem>
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 16</param><content>"spacing" is encoded in the "index_align&lt;1&gt;" field, and "index_align&lt;0&gt;" is set to <binarynumber>0</binarynumber>.</content>
</listitem>
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 32</param><content>"spacing" is encoded in the "index_align&lt;2&gt;" field, and "index_align&lt;1:0&gt;" is set to <binarynumber>0b00</binarynumber>.</content>
</listitem>
</list>
<para>The register <syntax>&lt;Dd&gt;</syntax> is encoded in the "D:Vd" field.</para>
<para>The permitted values and encoding of <syntax>&lt;index&gt;</syntax> depend on <syntax>&lt;size&gt;</syntax>:</para>
<list type="param">
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 8</param><content><syntax>&lt;index&gt;</syntax> is in the range 0 to 7, encoded in the "index_align&lt;3:1&gt;" field.</content>
</listitem>
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 16</param><content><syntax>&lt;index&gt;</syntax> is in the range 0 to 3, encoded in the "index_align&lt;3:2&gt;" field.</content>
</listitem>
<listitem>
<param><syntax>&lt;size&gt;</syntax> == 32</param><content><syntax>&lt;index&gt;</syntax> is 0 or 1, encoded in the "index_align&lt;3&gt;" field.</content>
</listitem>
</list>
</intro>
</account>
</explanation>
<explanation enclist="VLD3_1_A1_nowb, VLD3_1_A2_nowb, VLD3_1_A3_nowb, VLD3_1_T1_nowb, VLD3_1_T2_nowb, VLD3_1_T3_nowb" symboldefcount="1">
<symbol link="sa_rn">&lt;Rn&gt;</symbol>
<account encodedin="Rn">
<intro>
<para>Is the general-purpose base register, encoded in the "Rn" field.</para>
</intro>
</account>
</explanation>
<explanation enclist="VLD3_1_A1_postr, VLD3_1_A2_postr, VLD3_1_A3_postr, VLD3_1_T1_postr, VLD3_1_T2_postr, VLD3_1_T3_postr" symboldefcount="1">
<symbol link="sa_rm">&lt;Rm&gt;</symbol>
<account encodedin="Rm">
<intro>
<para>Is the general-purpose index register containing an offset applied after the access, encoded in the "Rm" field.</para>
</intro>
</account>
</explanation>
</explanations>
<ps_section howmany="1">
<ps name="aarch32/instrs/VLD3_1/Op_A.txt" mylink="execute" enclabels="" sections="1" secttype="Operation">
<pstext mayhavelinks="1" section="Execute" rep_section="execute">if <a link="impl-aarch32.ConditionPassed.0" file="shared_pseudocode.xml" hover="function: boolean ConditionPassed()">ConditionPassed</a>() then
EncodingSpecificOperations(); <a link="impl-aarch32.CheckAdvSIMDEnabled.0" file="shared_pseudocode.xml" hover="function: CheckAdvSIMDEnabled()">CheckAdvSIMDEnabled</a>();
address = <a link="impl-aarch32.R.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) R[integer n]">R</a>[n];
<a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &amp;vector, integer e, integer size] = bits(size) value">Elem</a>[<a link="impl-aarch32.D.write.1" file="shared_pseudocode.xml" hover="accessor: D[integer n] = bits(64) value">D</a>[d], index,8*ebytes] = <a link="impl-aarch32.MemU.read.2" file="shared_pseudocode.xml" hover="accessor: bits(8*size) MemU[bits(32) address, integer size]">MemU</a>[address,ebytes];
<a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &amp;vector, integer e, integer size] = bits(size) value">Elem</a>[<a link="impl-aarch32.D.write.1" file="shared_pseudocode.xml" hover="accessor: D[integer n] = bits(64) value">D</a>[d2],index,8*ebytes] = <a link="impl-aarch32.MemU.read.2" file="shared_pseudocode.xml" hover="accessor: bits(8*size) MemU[bits(32) address, integer size]">MemU</a>[address+ebytes,ebytes];
<a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &amp;vector, integer e, integer size] = bits(size) value">Elem</a>[<a link="impl-aarch32.D.write.1" file="shared_pseudocode.xml" hover="accessor: D[integer n] = bits(64) value">D</a>[d3],index,8*ebytes] = <a link="impl-aarch32.MemU.read.2" file="shared_pseudocode.xml" hover="accessor: bits(8*size) MemU[bits(32) address, integer size]">MemU</a>[address+2*ebytes,ebytes];
if wback then
if register_index then
<a link="impl-aarch32.R.write.1" file="shared_pseudocode.xml" hover="accessor: R[integer n] = bits(32) value">R</a>[n] = <a link="impl-aarch32.R.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) R[integer n]">R</a>[n] + <a link="impl-aarch32.R.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) R[integer n]">R</a>[m];
else
<a link="impl-aarch32.R.write.1" file="shared_pseudocode.xml" hover="accessor: R[integer n] = bits(32) value">R</a>[n] = <a link="impl-aarch32.R.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) R[integer n]">R</a>[n] + 3*ebytes;</pstext>
</ps>
</ps_section>
</instructionsection>