archived-ballistic/spec/arm64_xml/pfalse_p.xml

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<instructionsection id="pfalse_p" title="PFALSE" type="instruction">
  <docvars>
    <docvar key="instr-class" value="sve" />
    <docvar key="isa" value="A64" />
    <docvar key="mnemonic" value="PFALSE" />
  </docvars>
  <heading>PFALSE</heading>
  <desc>
    <brief>Set all predicate elements to false</brief>
    <description>
      <para>Set all elements in the destination predicate to false.</para>
      <para>For programmer convenience, an assembler must also accept predicate-as-counter register name for the destination predicate register.</para>
    </description>
    <status>Green</status>
    <predicated>False</predicated>
    <uses_dit condition="FEAT_SVE2 is implemented or FEAT_SME is implemented">True</uses_dit>
  </desc>
  <alias_list howmany="0"></alias_list>
  <classes>
    <iclass name="SVE" oneof="1" id="iclass_sve" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="instr-class" value="sve" />
        <docvar key="isa" value="A64" />
        <docvar key="mnemonic" value="PFALSE" />
      </docvars>
      <iclassintro count="1"></iclassintro>
      <regdiagram form="32" psname="PFALSE-P-_" tworows="1">
        <box hibit="31" width="8" settings="8">
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="23" name="op" settings="1">
          <c>0</c>
        </box>
        <box hibit="22" name="S" usename="1" settings="1">
          <c>0</c>
        </box>
        <box hibit="21" width="12" settings="12">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="9" width="6" settings="6">
          <c>0</c>
          <c>0</c>
          <c>0</c>
          <c>0</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="3" width="4" name="Pd" usename="1">
          <c colspan="4"></c>
        </box>
      </regdiagram>
      <encoding name="pfalse_p_" oneofinclass="1" oneof="1" label="">
        <docvars>
          <docvar key="instr-class" value="sve" />
          <docvar key="isa" value="A64" />
          <docvar key="mnemonic" value="PFALSE" />
        </docvars>
        <asmtemplate><text>PFALSE  </text><a link="sa_pd" hover="Destination scalable predicate register (field &quot;Pd&quot;)">&lt;Pd&gt;</a><text>.B</text></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="PFALSE-P-_" mylink="PFALSE-P-_" enclabels="" sections="1" secttype="noheading">
          <pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSVE.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE()">HaveSVE</a>() &amp;&amp; !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pd);</pstext>
        </ps>
      </ps_section>
    </iclass>
  </classes>
  <explanations scope="all">
    <explanation enclist="pfalse_p_" symboldefcount="1">
      <symbol link="sa_pd">&lt;Pd&gt;</symbol>
      <account encodedin="Pd">
        <intro>
          <para>Is the name of the destination scalable predicate register, encoded in the "Pd" field.</para>
        </intro>
      </account>
    </explanation>
  </explanations>
  <ps_section howmany="1">
    <ps name="PFALSE-P-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
      <pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckSVEEnabled()">CheckSVEEnabled</a>();
constant integer VL = <a link="impl-aarch64.CurrentVL.read.none" file="shared_pseudocode.xml" hover="accessor: integer CurrentVL">CurrentVL</a>;
constant integer PL = VL DIV 8;
<a link="impl-aarch64.P.write.2" file="shared_pseudocode.xml" hover="accessor: P[integer n, integer width] = bits(width) value">P</a>[d, PL] = <a link="impl-shared.Zeros.1" file="shared_pseudocode.xml" hover="function: bits(N) Zeros(integer N)">Zeros</a>(PL);</pstext>
    </ps>
  </ps_section>
</instructionsection>