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<instructionsection id="GCSPOPCX_SYS" title="GCSPOPCX -- A64" type="alias">
  <docvars>
    <docvar key="alias_mnemonic" value="GCSPOPCX"/>
    <docvar key="instr-class" value="system"/>
    <docvar key="isa" value="A64"/>
    <docvar key="mnemonic" value="SYS"/>
  </docvars>
  <heading>GCSPOPCX</heading>
  <desc>
    <brief>
      <para>Guarded Control Stack pop and compare exception return record</para>
    </brief>
    <authored>
      <para>This instruction loads an
exception return record from the location indicated by the current Guarded
control stack pointer register, compares the loaded values with the current
ELR_ELx, SPSR_ELx, and LR, and increments the pointer by the size of a
Guarded Control Stack exception return record.</para>
    </authored>
  </desc>
  <aliasto refiform="sys.xml" iformid="SYS">SYS</aliasto>
  <classes>
    <iclass name="System" oneof="1" id="iclass_system" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="instr-class" value="system"/>
        <docvar key="isa" value="A64"/>
        <docvar key="mnemonic" value="SYS"/>
      </docvars>
      <iclassintro count="1"/>
      <arch_variants>
        <arch_variant feature="FEAT_GCS" name="v9Ap4"/>
      </arch_variants>
      <regdiagram form="32" psname="A64.control.systeminstrs.SYS_CR_systeminstrs.GCSPOPCX" tworows="1">
        <box hibit="31" width="3" settings="3">
          <c>1</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="28" width="3" settings="3">
          <c>1</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="25" width="4" settings="4">
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="21" name="L" usename="1" settings="1" psbits="x">
          <c>0</c>
        </box>
        <box hibit="20" width="2" settings="2">
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="18" width="3" name="op1" usename="1" settings="3" psbits="xxx">
          <c>0</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="15" width="4" name="CRn" usename="1" settings="4" psbits="xxxx">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>1</c>
        </box>
        <box hibit="11" width="4" name="CRm" usename="1" settings="4" psbits="xxxx">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>1</c>
        </box>
        <box hibit="7" width="3" name="op2" usename="1" settings="3" psbits="xxx">
          <c>1</c>
          <c>0</c>
          <c>1</c>
        </box>
        <box hibit="4" width="5" name="Rt" usename="1">
          <c colspan="5"/>
        </box>
      </regdiagram>
      <encoding name="GCSPOPCX_SYS_CR_systeminstrs" oneofinclass="1" oneof="1" label="">
        <docvars>
          <docvar key="instr-class" value="system"/>
          <docvar key="isa" value="A64"/>
          <docvar key="mnemonic" value="SYS"/>
          <docvar key="alias_mnemonic" value="GCSPOPCX"/>
        </docvars>
        <asmtemplate><text>GCSPOPCX</text></asmtemplate>
        <equivalent_to>
          <asmtemplate><a href="sys.xml#SYS_CR_systeminstrs">SYS</a><text>  #0, C7, C7, #5{, </text><a hover="Is the 64-bit name of the optional general-purpose source register, defaulting to '11111', encoded in the &quot;Rt&quot; field." href="sys.xml#XtOrXZR__2">&lt;Xt&gt;</a><text>}</text></asmtemplate>
          <aliascond>Unconditionally</aliascond>
        </equivalent_to>
      </encoding>
    </iclass>
  </classes>
  <explanations scope="all"/>
  <timestamp>2026-03-12 12:23:09</timestamp>
  <commit_id>2025-09_rel_asl1</commit_id>
</instructionsection>
