306 lines
14 KiB
XML
306 lines
14 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="VMOVN" title="VMOVN -- AArch32" type="instruction">
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<docvars>
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="mnemonic" value="VMOVN" />
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</docvars>
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<heading>VMOVN</heading>
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<desc>
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<brief>
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<para>Vector Move and Narrow</para>
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</brief>
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<authored>
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<para>Vector Move and Narrow copies the least significant half of each element of a quadword vector into the corresponding elements of a doubleword vector.</para>
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<para>The operand vector elements can be any one of 16-bit, 32-bit, or 64-bit integers. There is no distinction between signed and unsigned integers.</para>
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<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>
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</authored>
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</desc>
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<operationalnotes>
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<para>If CPSR.DIT is 1 and this instruction passes its condition execution check:</para>
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<list type="unordered">
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<listitem><content>The execution time of this instruction is independent of:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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<listitem><content>The response of this instruction to asynchronous exceptions does not vary based on:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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</list>
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</operationalnotes>
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<alias_list howmany="2">
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<alias_list_intro>This instruction is used by the aliases </alias_list_intro>
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<aliasref aliaspageid="VRSHRN_VMOVN" aliasfile="vrshrn_vmovn.xml" hover="Vector Rounding Shift Right and Narrow" punct=" and ">
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<text>VRSHRN (zero)</text>
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<aliaspref>Never</aliaspref>
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</aliasref>
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<aliasref aliaspageid="VSHRN_VMOVN" aliasfile="vshrn_vmovn.xml" hover="Vector Shift Right Narrow" punct=".">
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<text>VSHRN (zero)</text>
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<aliaspref>Never</aliaspref>
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</aliasref>
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<alias_list_outro>
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<text> See </text>
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<aliastablelink />
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<text> below for details of when each alias is preferred.</text>
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</alias_list_outro>
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</alias_list>
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<classes>
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<classesintro count="2">
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<txt>It has encodings from the following instruction sets:</txt>
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<txt> A32 (</txt>
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<a href="#iclass_a1">A1</a>
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<txt>)</txt>
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<txt> and </txt>
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<txt> T32 (</txt>
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<a href="#iclass_t1">T1</a>
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<txt>)</txt>
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<txt>.</txt>
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</classesintro>
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<iclass name="A1" oneof="2" id="iclass_a1" no_encodings="1" isa="A32">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="VMOVN" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="aarch32/instrs/VMOVN/T1A1_A.txt">
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<box hibit="31" width="9" settings="9">
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</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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<c>1</c>
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</box>
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<box hibit="22" name="D" usename="1">
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<c></c>
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</box>
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<box hibit="21" 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="19" width="2" name="size" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="17" width="2" name="opc1" 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" width="4" name="Vd" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="11" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" width="4" name="opc2" settings="4">
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<c>0</c>
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<c>1</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="6" name="Q" settings="1">
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<c>0</c>
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</box>
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<box hibit="5" name="M" usename="1">
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<c></c>
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</box>
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<box hibit="4" settings="1">
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<c>0</c>
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</box>
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<box hibit="3" width="4" name="Vm" usename="1">
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<c colspan="4"></c>
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</box>
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</regdiagram>
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<encoding name="VMOVN_A1" oneofinclass="1" oneof="2" label="A1">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="VMOVN" />
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</docvars>
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<asmtemplate><text>VMOVN</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><c></a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text>.</text><a link="sa_dt" hover="Data type for elements of operand (field "size")"><dt></a><text> </text><a link="sa_dd" hover="64-bit SIMD&FP destination register (field "D:Vd")"><Dd></a><text>, </text><a link="sa_qm" hover="128-bit SIMD&FP source register (field "M:Vm")"><Qm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/VMOVN/T1A1_A.txt" mylink="aarch32.instrs.VMOVN.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then UNDEFINED;
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if Vm<0> == '1' then UNDEFINED;
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esize = 8 << <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(size); elements = 64 DIV esize;
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d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</pstext>
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</ps>
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</ps_section>
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</iclass>
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<iclass name="T1" oneof="2" id="iclass_t1" no_encodings="1" isa="T32">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="VMOVN" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="16x2" psname="aarch32/instrs/VMOVN/T1A1_A.txt">
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<box hibit="31" width="9" settings="9">
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</c>
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<c>1</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="22" name="D" usename="1">
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<c></c>
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</box>
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<box hibit="21" 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="19" width="2" name="size" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="17" width="2" name="opc1" 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" width="4" name="Vd" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="11" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" width="4" name="opc2" settings="4">
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<c>0</c>
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<c>1</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="6" name="Q" settings="1">
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<c>0</c>
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</box>
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<box hibit="5" name="M" usename="1">
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<c></c>
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</box>
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<box hibit="4" settings="1">
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<c>0</c>
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</box>
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<box hibit="3" width="4" name="Vm" usename="1">
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<c colspan="4"></c>
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</box>
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</regdiagram>
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<encoding name="VMOVN_T1" oneofinclass="1" oneof="2" label="T1">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="VMOVN" />
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</docvars>
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<asmtemplate><text>VMOVN</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><c></a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text>.</text><a link="sa_dt" hover="Data type for elements of operand (field "size")"><dt></a><text> </text><a link="sa_dd" hover="64-bit SIMD&FP destination register (field "D:Vd")"><Dd></a><text>, </text><a link="sa_qm" hover="128-bit SIMD&FP source register (field "M:Vm")"><Qm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/VMOVN/T1A1_A.txt" mylink="aarch32.instrs.VMOVN.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '11' then UNDEFINED;
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if Vm<0> == '1' then UNDEFINED;
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esize = 8 << <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(size); elements = 64 DIV esize;
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d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</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="VMOVN_A1" symboldefcount="1">
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<symbol link="sa_c_1"><c></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="isa" value="A32" />
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</docvars>
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<intro>
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<para>For encoding A1: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>. This encoding must be unconditional.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VMOVN_T1" symboldefcount="2">
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<symbol link="sa_c"><c></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="isa" value="T32" />
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</docvars>
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<intro>
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<para>For encoding T1: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VMOVN_A1, VMOVN_T1" symboldefcount="1">
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<symbol link="sa_q"><q></symbol>
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<account encodedin="">
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<intro>
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<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VMOVN_A1, VMOVN_T1" symboldefcount="1">
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<symbol link="sa_dt"><dt></symbol>
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<definition encodedin="size">
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<intro>Is the data type for the elements of the operand, </intro>
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<table class="valuetable">
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<tgroup cols="2">
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<thead>
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<row>
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<entry class="bitfield">size</entry>
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<entry class="symbol"><dt></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry class="bitfield">00</entry>
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<entry class="symbol">I16</entry>
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</row>
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<row>
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<entry class="bitfield">01</entry>
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<entry class="symbol">I32</entry>
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</row>
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<row>
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<entry class="bitfield">10</entry>
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<entry class="symbol">I64</entry>
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</row>
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<row>
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<entry class="bitfield">11</entry>
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<entry class="symbol">RESERVED</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</definition>
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</explanation>
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<explanation enclist="VMOVN_A1, VMOVN_T1" symboldefcount="1">
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<symbol link="sa_dd"><Dd></symbol>
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<account encodedin="D:Vd">
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<intro>
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<para>Is the 64-bit name of the SIMD&FP destination register, encoded in the "D:Vd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VMOVN_A1, VMOVN_T1" symboldefcount="1">
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<symbol link="sa_qm"><Qm></symbol>
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<account encodedin="M:Vm">
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<intro>
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<para>Is the 128-bit name of the SIMD&FP source register, encoded in the "M:Vm" field as <Qm>*2.</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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<aliastablehook anchor="aliasconditions">Alias Conditions</aliastablehook>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/VMOVN/Op_A.txt" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<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
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EncodingSpecificOperations(); <a link="impl-aarch32.CheckAdvSIMDEnabled.0" file="shared_pseudocode.xml" hover="function: CheckAdvSIMDEnabled()">CheckAdvSIMDEnabled</a>();
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for e = 0 to elements-1
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<a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &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],e,esize] = <a link="impl-shared.Elem.read.3" file="shared_pseudocode.xml" hover="accessor: bits(size) Elem[bits(N) vector, integer e, integer size]">Elem</a>[<a link="impl-aarch32.Qin.read.1" file="shared_pseudocode.xml" hover="accessor: bits(128) Qin[integer n]">Qin</a>[m>>1],e,2*esize]<esize-1:0>;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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