archived-ballistic/spec/arm64_xml/setffr_f.xml

<?xml version="1.0" encoding="utf-8"?>
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<instructionsection id="setffr_f" title="SETFFR" type="instruction">
  <docvars>
    <docvar key="instr-class" value="sve" />
    <docvar key="isa" value="A64" />
    <docvar key="mnemonic" value="SETFFR" />
  </docvars>
  <heading>SETFFR</heading>
  <desc>
    <brief>Initialise the first-fault register to all true</brief>
    <description>
      <para>Initialise the first-fault register (<asm-code>FFR</asm-code>) to all true prior to a sequence of first-fault or non-fault loads. This instruction is unpredicated.</para>
      <para>This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.</para>
    </description>
    <status>Green</status>
    <predicated>False</predicated>
    <uses_dit condition="FEAT_SVE2 is implemented or FEAT_SME is implemented">True</uses_dit>
    <sm_policy>SM_0_only</sm_policy>
  </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="SETFFR" />
      </docvars>
      <iclassintro count="1"></iclassintro>
      <regdiagram form="32" psname="SETFFR-F-_">
        <box hibit="31" width="2" settings="2">
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="29" width="6" settings="6">
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="23" name="opc&lt;1&gt;" settings="1">
          <c>0</c>
        </box>
        <box hibit="22" name="opc&lt;0&gt;" settings="1">
          <c>0</c>
        </box>
        <box hibit="21" width="2" settings="2">
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="19" width="10" settings="10">
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</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" settings="1">
          <c>0</c>
        </box>
        <box hibit="2" settings="1">
          <c>0</c>
        </box>
        <box hibit="1" width="2" settings="2">
          <c>0</c>
          <c>0</c>
        </box>
      </regdiagram>
      <encoding name="setffr_f_" oneofinclass="1" oneof="1" label="">
        <docvars>
          <docvar key="instr-class" value="sve" />
          <docvar key="isa" value="A64" />
          <docvar key="mnemonic" value="SETFFR" />
        </docvars>
        <asmtemplate><text>SETFFR  </text></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="SETFFR-F-_" mylink="SETFFR-F-_" 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>() then UNDEFINED;</pstext>
        </ps>
      </ps_section>
    </iclass>
  </classes>
  <explanations scope="all"></explanations>
  <ps_section howmany="1">
    <ps name="SETFFR-F-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
      <pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckNonStreamingSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckNonStreamingSVEEnabled()">CheckNonStreamingSVEEnabled</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.FFR.write.1" file="shared_pseudocode.xml" hover="accessor: FFR[integer width] = bits(width) value">FFR</a>[PL] = <a link="impl-shared.Ones.1" file="shared_pseudocode.xml" hover="function: bits(N) Ones(integer N)">Ones</a>(PL);</pstext>
    </ps>
  </ps_section>
</instructionsection>