<?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="BC_cond" title="BC.cond -- A64" type="instruction">
  <docvars>
    <docvar key="branch-offset" value="br19"/>
    <docvar key="compare-with" value="cmp-cond"/>
    <docvar key="instr-class" value="general"/>
    <docvar key="isa" value="A64"/>
    <docvar key="mnemonic" value="BC"/>
  </docvars>
  <heading>BC.cond</heading>
  <desc>
    <brief>
      <para>Branch consistent conditionally</para>
    </brief>
    <authored>
      <para>This instruction branches conditionally to a label at a PC-relative
offset, with a hint that this branch is very unlikely to change direction.
This instruction provides a hint that this is not a subroutine call or return.</para>
    </authored>
  </desc>
  <alias_list howmany="0"/>
  <classes>
    <iclass name="19-bit signed PC-relative branch offset" oneof="1" id="iclass_19_bit_signed_pc_relative_branch_offset" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="branch-offset" value="br19"/>
        <docvar key="compare-with" value="cmp-cond"/>
        <docvar key="instr-class" value="general"/>
        <docvar key="isa" value="A64"/>
        <docvar key="mnemonic" value="BC"/>
      </docvars>
      <iclassintro count="1"/>
      <arch_variants>
        <arch_variant feature="FEAT_HBC" name="v8Ap8"/>
      </arch_variants>
      <regdiagram form="32" psname="A64.control.condbranch.BC_only_condbranch" tworows="1">
        <box hibit="31" width="3" settings="3">
          <c>0</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="2" settings="2">
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="23" width="19" name="imm19" usename="1">
          <c colspan="19"/>
        </box>
        <box hibit="4" name="o0" usename="1" settings="1" psbits="x">
          <c>1</c>
        </box>
        <box hibit="3" width="4" name="cond" usename="1">
          <c colspan="4"/>
        </box>
      </regdiagram>
      <encoding name="BC_only_condbranch" oneofinclass="1" oneof="1" label="">
        <docvars>
          <docvar key="branch-offset" value="br19"/>
          <docvar key="compare-with" value="cmp-cond"/>
          <docvar key="instr-class" value="general"/>
          <docvar key="isa" value="A64"/>
          <docvar key="mnemonic" value="BC"/>
        </docvars>
        <asmtemplate><text>BC.</text><a hover="Is one of the standard conditions, encoded in the standard way, and " link="cond_option">&lt;cond&gt;</a><text>  </text><a hover="Is the program label to be conditionally branched to. Its offset from the address of this instruction, in the range +/-1MB, is encoded as &quot;imm19&quot; times 4." link="imm19_offset">&lt;label&gt;</a></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="A64.control.condbranch.BC_only_condbranch" sections="1" secttype="noheading">
          <pstext mayhavelinks="1" section="Decode" rep_section="decode">if !IsFeatureImplemented(FEAT_HBC) then <a link="func_EndOfDecode_1" file="shared_pseudocode.xml">EndOfDecode</a>(<a link="enum_Decode_UNDEF" file="shared_pseudocode.xml">Decode_UNDEF</a>); end;
let offset : bits(64) = SignExtend{}(imm19::'00');
let condition : bits(4) = cond;</pstext></ps>
      </ps_section>
    </iclass>
  </classes>
  <explanations scope="all">
    <explanation enclist="BC_only_condbranch" symboldefcount="1">
      <symbol link="cond_option">&lt;cond&gt;</symbol>
      <definition encodedin="cond">
        <intro>Is one of the standard conditions, encoded in the standard way, and </intro>
        <table class="valuetable">
          <tgroup cols="2">
            <thead>
              <row>
                <entry class="bitfield">cond</entry>
                <entry class="symbol">&lt;cond&gt;</entry>
              </row>
            </thead>
            <tbody>
              <row>
                <entry class="bitfield">0000</entry>
                <entry class="symbol">EQ</entry>
              </row>
              <row>
                <entry class="bitfield">0001</entry>
                <entry class="symbol">NE</entry>
              </row>
              <row>
                <entry class="bitfield">0010</entry>
                <entry class="symbol">CS</entry>
              </row>
              <row>
                <entry class="bitfield">0011</entry>
                <entry class="symbol">CC</entry>
              </row>
              <row>
                <entry class="bitfield">0100</entry>
                <entry class="symbol">MI</entry>
              </row>
              <row>
                <entry class="bitfield">0101</entry>
                <entry class="symbol">PL</entry>
              </row>
              <row>
                <entry class="bitfield">0110</entry>
                <entry class="symbol">VS</entry>
              </row>
              <row>
                <entry class="bitfield">0111</entry>
                <entry class="symbol">VC</entry>
              </row>
              <row>
                <entry class="bitfield">1000</entry>
                <entry class="symbol">HI</entry>
              </row>
              <row>
                <entry class="bitfield">1001</entry>
                <entry class="symbol">LS</entry>
              </row>
              <row>
                <entry class="bitfield">1010</entry>
                <entry class="symbol">GE</entry>
              </row>
              <row>
                <entry class="bitfield">1011</entry>
                <entry class="symbol">LT</entry>
              </row>
              <row>
                <entry class="bitfield">1100</entry>
                <entry class="symbol">GT</entry>
              </row>
              <row>
                <entry class="bitfield">1101</entry>
                <entry class="symbol">LE</entry>
              </row>
              <row>
                <entry class="bitfield">1110</entry>
                <entry class="symbol">AL</entry>
              </row>
              <row>
                <entry class="bitfield">1111</entry>
                <entry class="symbol">NV</entry>
              </row>
            </tbody>
          </tgroup>
        </table>
      </definition>
    </explanation>
    <explanation enclist="BC_only_condbranch" symboldefcount="1">
      <symbol link="imm19_offset">&lt;label&gt;</symbol>
      <account encodedin="imm19">
        <intro>
          <para>Is the program label to be conditionally branched to. Its offset from the address of this instruction, in the range +/-1MB, is encoded as &quot;imm19&quot; times 4.</para>
        </intro>
      </account>
    </explanation>
  </explanations>
  <ps_section howmany="1">
    <ps name="A64.control.condbranch.BC_only_condbranch" sections="1" secttype="Operation">
      <pstext mayhavelinks="1" section="Execute" rep_section="execute">let branch_conditional : boolean = TRUE;
if <a link="func_ConditionHolds_1" file="shared_pseudocode.xml">ConditionHolds</a>(condition) then
    <a link="func_BranchTo_4" file="shared_pseudocode.xml">BranchTo</a>{64}(<a link="func_PC64_0" file="shared_pseudocode.xml">PC64</a>() + offset, <a link="enum_BranchType_DIR" file="shared_pseudocode.xml">BranchType_DIR</a>, branch_conditional);
else
    <a link="func_BranchNotTaken_2" file="shared_pseudocode.xml">BranchNotTaken</a>(<a link="enum_BranchType_DIR" file="shared_pseudocode.xml">BranchType_DIR</a>, branch_conditional);
end;</pstext></ps>
  </ps_section>
  <timestamp>2026-03-26 20:27:25</timestamp>
  <commit_id>2026-03_rel</commit_id>
</instructionsection>