<?xml version="1.0" ?><?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) 2010-2026 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="VACLT_VACGT" title="VACLT -- AArch32" type="alias">
  <docvars>
    <docvar key="alias_mnemonic" value="VACLT"/>
    <docvar key="instr-class" value="fpsimd"/>
    <docvar key="mnemonic" value="VACGT"/>
  </docvars>
  <heading>VACLT</heading>
  <desc>
    <brief>
      <para>Vector Absolute Compare Less Than</para>
    </brief>
    <authored>
      <para>Vector Absolute Compare Less Than takes the absolute value of each element in a vector, and compares it with the absolute value of the corresponding element of a second vector. If the first is less than the second, the corresponding element in the destination vector is set to all ones. Otherwise, it is set to all zeros.</para>
    </authored>
  </desc>
  <aliasto refiform="vacgt.xml" iformid="VACGT">VACGT</aliasto>
  <classes>
    <classesintro count="2">
      <txt>It has encodings from the following instruction sets:</txt>
      <txt> A32 (</txt>
      <a href="#iclass_a1">A1</a>
      <txt>)</txt>
      <txt> and </txt>
      <txt> T32 (</txt>
      <a href="#iclass_t1">T1</a>
      <txt>)</txt>
      <txt>.</txt>
    </classesintro>
    <iclass name="A1" oneof="2" id="iclass_a1" no_encodings="2" isa="A32">
      <docvars>
        <docvar key="armarmheading" value="A1"/>
        <docvar key="instr-class" value="fpsimd"/>
        <docvar key="isa" value="A32"/>
        <docvar key="mnemonic" value="VACGT"/>
      </docvars>
      <iclassintro count="2"/>
      <regdiagram form="32" psname="A32.uncond_as.advsimddp.simd3reg_same.VACGT_A1_D.VACLT" tworows="1">
        <box hibit="31" width="7" settings="7">
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="24" name="U" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="23" width="1" settings="1">
          <c>0</c>
        </box>
        <box hibit="22" width="1" name="D" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="21" name="op" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="20" width="1" name="sz" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="19" width="4" name="Vn" usename="1">
          <c colspan="4"/>
        </box>
        <box hibit="15" width="4" name="Vd" usename="1">
          <c colspan="4"/>
        </box>
        <box hibit="11" width="4" name="opc" usename="1" settings="4" psbits="xxxx">
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="7" width="1" name="N" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="6" width="1" name="Q" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="5" width="1" name="M" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="4" name="o1" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="3" width="4" name="Vm" usename="1">
          <c colspan="4"/>
        </box>
      </regdiagram>
      <encoding name="VACLT_VACGT_A1_D" oneofinclass="2" oneof="4" label="64-bit SIMD vector" bitdiffs="Q == 0">
        <docvars>
          <docvar key="armarmheading" value="A1"/>
          <docvar key="instr-class" value="fpsimd"/>
          <docvar key="isa" value="A32"/>
          <docvar key="mnemonic" value="VACGT"/>
          <docvar key="simdvectorsize" value="double"/>
          <docvar key="alias_mnemonic" value="VACLT"/>
        </docvars>
        <box hibit="6" width="1" name="Q">
          <c>0</c>
        </box>
        <asmtemplate><text>VACLT{</text><a hover="For the &quot;A1 128-bit SIMD vector&quot; and &quot;A1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf). This encoding must be unconditional." link="AL_option__3">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." link="qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " link="dt_option__5">&lt;dt&gt;</a><text>  {</text><a hover="Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field." link="D_Vd">&lt;Dd&gt;</a><text>, }</text><a hover="Is the 64-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field." link="N_Vn">&lt;Dn&gt;</a><text>, </text><a hover="Is the 64-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field." link="M_Vm">&lt;Dm&gt;</a></asmtemplate>
        <equivalent_to>
          <asmtemplate><a href="vacgt.xml#VACGT_A1_D">VACGT</a><text>{</text><a hover="For the &quot;A1 128-bit SIMD vector&quot; and &quot;A1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf). This encoding must be unconditional." href="vacgt.xml#AL_option__3">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " href="vacgt.xml#dt_option__5">&lt;dt&gt;</a><text>  </text><a hover="Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field." href="vacgt.xml#D_Vd">&lt;Dd&gt;</a><text>, </text><a hover="Is the 64-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field." href="vacgt.xml#M_Vm">&lt;Dm&gt;</a><text>, </text><a hover="Is the 64-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field." href="vacgt.xml#N_Vn">&lt;Dn&gt;</a></asmtemplate>
          <aliascond>Never</aliascond>
        </equivalent_to>
      </encoding>
      <encoding name="VACLT_VACGT_A1_Q" oneofinclass="2" oneof="4" label="128-bit SIMD vector" bitdiffs="Q == 1">
        <docvars>
          <docvar key="armarmheading" value="A1"/>
          <docvar key="instr-class" value="fpsimd"/>
          <docvar key="isa" value="A32"/>
          <docvar key="simdvectorsize" value="quad"/>
          <docvar key="mnemonic" value="VACGT"/>
          <docvar key="alias_mnemonic" value="VACLT"/>
        </docvars>
        <box hibit="6" width="1" name="Q">
          <c>1</c>
        </box>
        <asmtemplate><text>VACLT{</text><a hover="For the &quot;A1 128-bit SIMD vector&quot; and &quot;A1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf). This encoding must be unconditional." link="AL_option__3">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." link="qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " link="dt_option__5">&lt;dt&gt;</a><text>  {</text><a hover="Is the 128-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field as &lt;Qd&gt;*2." link="D_Vd__4">&lt;Qd&gt;</a><text>, }</text><a hover="Is the 128-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field as &lt;Qn&gt;*2." link="N_Vn__2">&lt;Qn&gt;</a><text>, </text><a hover="Is the 128-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field as &lt;Qm&gt;*2." link="M_Vm__5">&lt;Qm&gt;</a></asmtemplate>
        <equivalent_to>
          <asmtemplate><a href="vacgt.xml#VACGT_A1_Q">VACGT</a><text>{</text><a hover="For the &quot;A1 128-bit SIMD vector&quot; and &quot;A1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf). This encoding must be unconditional." href="vacgt.xml#AL_option__3">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " href="vacgt.xml#dt_option__5">&lt;dt&gt;</a><text>  </text><a hover="Is the 128-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field as &lt;Qd&gt;*2." href="vacgt.xml#D_Vd__4">&lt;Qd&gt;</a><text>, </text><a hover="Is the 128-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field as &lt;Qm&gt;*2." href="vacgt.xml#M_Vm__5">&lt;Qm&gt;</a><text>, </text><a hover="Is the 128-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field as &lt;Qn&gt;*2." href="vacgt.xml#N_Vn__2">&lt;Qn&gt;</a></asmtemplate>
          <aliascond>Never</aliascond>
        </equivalent_to>
      </encoding>
    </iclass>
    <iclass name="T1" oneof="2" id="iclass_t1" no_encodings="2" isa="T32">
      <docvars>
        <docvar key="armarmheading" value="T1"/>
        <docvar key="instr-class" value="fpsimd"/>
        <docvar key="isa" value="T32"/>
        <docvar key="mnemonic" value="VACGT"/>
      </docvars>
      <iclassintro count="2"/>
      <regdiagram form="16x2" psname="T32.w.cpaf.simddp.simd_3same.VACGT_T1_D.VACLT" tworows="1">
        <box hibit="31" width="3" settings="3">
          <c>1</c>
          <c>1</c>
          <c>1</c>
        </box>
        <box hibit="28" name="U" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="27" width="5" settings="5">
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="22" width="1" name="D" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="21" name="op" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="20" width="1" name="sz" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="19" width="4" name="Vn" usename="1">
          <c colspan="4"/>
        </box>
        <box hibit="15" width="4" name="Vd" usename="1">
          <c colspan="4"/>
        </box>
        <box hibit="11" width="4" name="opc" usename="1" settings="4" psbits="xxxx">
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="7" width="1" name="N" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="6" width="1" name="Q" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="5" width="1" name="M" usename="1">
          <c colspan="1"/>
        </box>
        <box hibit="4" name="o1" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="3" width="4" name="Vm" usename="1">
          <c colspan="4"/>
        </box>
      </regdiagram>
      <encoding name="VACLT_VACGT_T1_D" oneofinclass="2" oneof="4" label="64-bit SIMD vector" bitdiffs="Q == 0">
        <docvars>
          <docvar key="armarmheading" value="T1"/>
          <docvar key="instr-class" value="fpsimd"/>
          <docvar key="isa" value="T32"/>
          <docvar key="mnemonic" value="VACGT"/>
          <docvar key="simdvectorsize" value="double"/>
          <docvar key="alias_mnemonic" value="VACLT"/>
        </docvars>
        <box hibit="6" width="1" name="Q">
          <c>0</c>
        </box>
        <asmtemplate><text>VACLT{</text><a hover="For the &quot;T1 128-bit SIMD vector&quot; and &quot;T1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf)." link="AL_option__6">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." link="qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " link="dt_option__5">&lt;dt&gt;</a><text>  {</text><a hover="Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field." link="D_Vd">&lt;Dd&gt;</a><text>, }</text><a hover="Is the 64-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field." link="N_Vn">&lt;Dn&gt;</a><text>, </text><a hover="Is the 64-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field." link="M_Vm">&lt;Dm&gt;</a></asmtemplate>
        <equivalent_to>
          <asmtemplate><a href="vacgt.xml#VACGT_T1_D">VACGT</a><text>{</text><a hover="For the &quot;T1 128-bit SIMD vector&quot; and &quot;T1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#AL_option__6">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " href="vacgt.xml#dt_option__5">&lt;dt&gt;</a><text>  </text><a hover="Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field." href="vacgt.xml#D_Vd">&lt;Dd&gt;</a><text>, </text><a hover="Is the 64-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field." href="vacgt.xml#M_Vm">&lt;Dm&gt;</a><text>, </text><a hover="Is the 64-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field." href="vacgt.xml#N_Vn">&lt;Dn&gt;</a></asmtemplate>
          <aliascond>Never</aliascond>
        </equivalent_to>
      </encoding>
      <encoding name="VACLT_VACGT_T1_Q" oneofinclass="2" oneof="4" label="128-bit SIMD vector" bitdiffs="Q == 1">
        <docvars>
          <docvar key="armarmheading" value="T1"/>
          <docvar key="instr-class" value="fpsimd"/>
          <docvar key="isa" value="T32"/>
          <docvar key="simdvectorsize" value="quad"/>
          <docvar key="mnemonic" value="VACGT"/>
          <docvar key="alias_mnemonic" value="VACLT"/>
        </docvars>
        <box hibit="6" width="1" name="Q">
          <c>1</c>
        </box>
        <asmtemplate><text>VACLT{</text><a hover="For the &quot;T1 128-bit SIMD vector&quot; and &quot;T1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf)." link="AL_option__6">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." link="qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " link="dt_option__5">&lt;dt&gt;</a><text>  {</text><a hover="Is the 128-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field as &lt;Qd&gt;*2." link="D_Vd__4">&lt;Qd&gt;</a><text>, }</text><a hover="Is the 128-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field as &lt;Qn&gt;*2." link="N_Vn__2">&lt;Qn&gt;</a><text>, </text><a hover="Is the 128-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field as &lt;Qm&gt;*2." link="M_Vm__5">&lt;Qm&gt;</a></asmtemplate>
        <equivalent_to>
          <asmtemplate><a href="vacgt.xml#VACGT_T1_Q">VACGT</a><text>{</text><a hover="For the &quot;T1 128-bit SIMD vector&quot; and &quot;T1 64-bit SIMD vector&quot; variants: see x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#AL_option__6">&lt;c&gt;</a><text>}{</text><a hover="See x[Standard assembler syntax fields](Babbefhf)." href="vacgt.xml#qw_option">&lt;q&gt;</a><text>}.</text><a hover="Is the data type for the elements of the vectors, " href="vacgt.xml#dt_option__5">&lt;dt&gt;</a><text>  </text><a hover="Is the 128-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field as &lt;Qd&gt;*2." href="vacgt.xml#D_Vd__4">&lt;Qd&gt;</a><text>, </text><a hover="Is the 128-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field as &lt;Qm&gt;*2." href="vacgt.xml#M_Vm__5">&lt;Qm&gt;</a><text>, </text><a hover="Is the 128-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field as &lt;Qn&gt;*2." href="vacgt.xml#N_Vn__2">&lt;Qn&gt;</a></asmtemplate>
          <aliascond>Never</aliascond>
        </equivalent_to>
      </encoding>
    </iclass>
  </classes>
  <explanations scope="all">
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_A1_Q" symboldefcount="1">
      <symbol link="AL_option__3">&lt;c&gt;</symbol>
      <account encodedin="">
        <intro>
          <para>For the &quot;A1 128-bit SIMD vector&quot; and &quot;A1 64-bit SIMD vector&quot; variants: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>. This encoding must be unconditional.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_T1_D, VACLT_VACGT_T1_Q" symboldefcount="2">
      <symbol link="AL_option__6">&lt;c&gt;</symbol>
      <account encodedin="">
        <intro>
          <para>For the &quot;T1 128-bit SIMD vector&quot; and &quot;T1 64-bit SIMD vector&quot; variants: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_A1_Q, VACLT_VACGT_T1_D, VACLT_VACGT_T1_Q" symboldefcount="1">
      <symbol link="qw_option">&lt;q&gt;</symbol>
      <account encodedin="">
        <intro>
          <para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_A1_Q, VACLT_VACGT_T1_D, VACLT_VACGT_T1_Q" symboldefcount="1">
      <symbol link="dt_option__5">&lt;dt&gt;</symbol>
      <definition encodedin="sz">
        <intro>Is the data type for the elements of the vectors, </intro>
        <table class="valuetable">
          <tgroup cols="2">
            <thead>
              <row>
                <entry class="bitfield">sz</entry>
                <entry class="symbol">&lt;dt&gt;</entry>
              </row>
            </thead>
            <tbody>
              <row>
                <entry class="bitfield">0</entry>
                <entry class="symbol">F32</entry>
              </row>
              <row>
                <entry class="bitfield">1</entry>
                <entry class="symbol">F16</entry>
              </row>
            </tbody>
          </tgroup>
        </table>
      </definition>
      <arch_variants>
        <arch_variant name="ARMv8.2-A"/>
      </arch_variants>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_T1_D" symboldefcount="1">
      <symbol link="D_Vd">&lt;Dd&gt;</symbol>
      <account encodedin="(D :: Vd)">
        <intro>
          <para>Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_T1_D" symboldefcount="1">
      <symbol link="N_Vn">&lt;Dn&gt;</symbol>
      <account encodedin="(N :: Vn)">
        <intro>
          <para>Is the 64-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_D, VACLT_VACGT_T1_D" symboldefcount="1">
      <symbol link="M_Vm">&lt;Dm&gt;</symbol>
      <account encodedin="(M :: Vm)">
        <intro>
          <para>Is the 64-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_Q, VACLT_VACGT_T1_Q" symboldefcount="1">
      <symbol link="D_Vd__4">&lt;Qd&gt;</symbol>
      <account encodedin="(D :: Vd)">
        <intro>
          <para>Is the 128-bit name of the SIMD&amp;FP destination register, encoded in the &quot;D:Vd&quot; field as &lt;Qd&gt;*2.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_Q, VACLT_VACGT_T1_Q" symboldefcount="1">
      <symbol link="N_Vn__2">&lt;Qn&gt;</symbol>
      <account encodedin="(N :: Vn)">
        <intro>
          <para>Is the 128-bit name of the first SIMD&amp;FP source register, encoded in the &quot;N:Vn&quot; field as &lt;Qn&gt;*2.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="VACLT_VACGT_A1_Q, VACLT_VACGT_T1_Q" symboldefcount="1">
      <symbol link="M_Vm__5">&lt;Qm&gt;</symbol>
      <account encodedin="(M :: Vm)">
        <intro>
          <para>Is the 128-bit name of the second SIMD&amp;FP source register, encoded in the &quot;M:Vm&quot; field as &lt;Qm&gt;*2.</para>
        </intro>
      </account>
    </explanation>
  </explanations>
  <timestamp>2026-03-26 20:27:25</timestamp>
  <commit_id>2026-03_rel</commit_id>
</instructionsection>