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202 lines
10 KiB
XML
202 lines
10 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet type="text/xsl" encoding="UTF-8" href="iform.xsl" version="1.0"?>
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<!DOCTYPE instructionsection PUBLIC "-//ARM//DTD instructionsection //EN" "iform-p.dtd">
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<!-- Copyright (c) 2010-2022 Arm Limited or its affiliates. All rights reserved. -->
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<!-- 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. -->
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<instructionsection id="CSINC" title="CSINC -- A64" type="instruction">
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<docvars>
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CSINC" />
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</docvars>
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<heading>CSINC</heading>
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<desc>
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<brief>
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<para>Conditional Select Increment</para>
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</brief>
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<authored>
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<para>Conditional Select Increment returns, in the destination register, the value of the first source register if the condition is TRUE, and otherwise returns the value of the second source register incremented by 1.</para>
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</authored>
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</desc>
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<operationalnotes>
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<para>If PSTATE.DIT is 1:</para>
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<list type="unordered">
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<listitem><content>The execution time of this instruction is independent of:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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<listitem><content>The response of this instruction to asynchronous exceptions does not vary based on:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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</list>
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</operationalnotes>
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<alias_list howmany="2">
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<alias_list_intro>This instruction is used by the aliases </alias_list_intro>
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<aliasref aliaspageid="CINC_CSINC" aliasfile="cinc_csinc.xml" hover="Conditional increment" punct=" and ">
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<text>CINC</text>
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<aliaspref>Rm != '11111' && cond != '111x' && Rn != '11111' && Rn == Rm</aliaspref>
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</aliasref>
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<aliasref aliaspageid="CSET_CSINC" aliasfile="cset_csinc.xml" hover="Conditional set" punct=".">
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<text>CSET</text>
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<aliaspref>Rm == '11111' && cond != '111x' && Rn == '11111'</aliaspref>
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</aliasref>
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<alias_list_outro>
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<text> See </text>
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<aliastablelink />
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<text> below for details of when each alias is preferred.</text>
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</alias_list_outro>
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</alias_list>
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<classes>
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<iclass name="Integer" oneof="1" id="iclass_general" no_encodings="2" isa="A64">
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<docvars>
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CSINC" />
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</docvars>
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<iclassintro count="2"></iclassintro>
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<regdiagram form="32" psname="aarch64/instrs/integer/conditional/select" tworows="1">
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<box hibit="31" name="sf" usename="1">
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<c></c>
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</box>
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<box hibit="30" name="op" usename="1" settings="1" psbits="x">
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<c>0</c>
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</box>
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<box hibit="29" name="S" settings="1">
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<c>0</c>
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</box>
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<box hibit="28" width="8" settings="8">
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<c>1</c>
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<c>1</c>
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<c>0</c>
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<c>1</c>
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<c>0</c>
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<c>1</c>
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<c>0</c>
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<c>0</c>
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</box>
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<box hibit="20" width="5" name="Rm" usename="1">
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<c colspan="5"></c>
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</box>
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<box hibit="15" width="4" name="cond" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="11" name="op2[1]" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" name="o2" usename="1" settings="1" psbits="x">
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<c>1</c>
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</box>
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<box hibit="9" width="5" name="Rn" usename="1">
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<c colspan="5"></c>
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</box>
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<box hibit="4" width="5" name="Rd" usename="1">
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<c colspan="5"></c>
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</box>
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</regdiagram>
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<encoding name="CSINC_32_condsel" oneofinclass="2" oneof="2" label="32-bit" bitdiffs="sf == 0">
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<docvars>
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<docvar key="datatype" value="32" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CSINC" />
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</docvars>
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<box hibit="31" width="1" name="sf">
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<c>0</c>
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</box>
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<asmtemplate><text>CSINC </text><a link="sa_wd" hover="32-bit general-purpose destination register (field "Rd")"><Wd></a><text>, </text><a link="sa_wn" hover="First 32-bit general-purpose source register (field "Rn")"><Wn></a><text>, </text><a link="sa_wm" hover="Second 32-bit general-purpose source register (field "Rm")"><Wm></a><text>, </text><a link="sa_cond" hover="Standard condition (field "cond")"><cond></a></asmtemplate>
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</encoding>
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<encoding name="CSINC_64_condsel" oneofinclass="2" oneof="2" label="64-bit" bitdiffs="sf == 1">
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<docvars>
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<docvar key="datatype" value="64" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CSINC" />
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</docvars>
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<box hibit="31" width="1" name="sf">
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<c>1</c>
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</box>
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<asmtemplate><text>CSINC </text><a link="sa_xd" hover="64-bit general-purpose destination register (field "Rd")"><Xd></a><text>, </text><a link="sa_xn" hover="First 64-bit general-purpose source register (field "Rn")"><Xn></a><text>, </text><a link="sa_xm" hover="Second 64-bit general-purpose source register (field "Rm")"><Xm></a><text>, </text><a link="sa_cond" hover="Standard condition (field "cond")"><cond></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch64/instrs/integer/conditional/select" mylink="aarch64.instrs.integer.conditional.select" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rd);
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integer n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rn);
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integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rm);
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integer datasize = if sf == '1' then 64 else 32;
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bits(4) condition = cond;
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boolean else_inv = (op == '1');
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boolean else_inc = (o2 == '1');</pstext>
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</ps>
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</ps_section>
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</iclass>
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</classes>
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<explanations scope="all">
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<explanation enclist="CSINC_32_condsel" symboldefcount="1">
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<symbol link="sa_wd"><Wd></symbol>
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<account encodedin="Rd">
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<intro>
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<para>Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_32_condsel" symboldefcount="1">
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<symbol link="sa_wn"><Wn></symbol>
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<account encodedin="Rn">
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<intro>
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<para>Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_32_condsel" symboldefcount="1">
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<symbol link="sa_wm"><Wm></symbol>
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<account encodedin="Rm">
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<intro>
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<para>Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_64_condsel" symboldefcount="1">
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<symbol link="sa_xd"><Xd></symbol>
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<account encodedin="Rd">
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<intro>
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<para>Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_64_condsel" symboldefcount="1">
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<symbol link="sa_xn"><Xn></symbol>
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<account encodedin="Rn">
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<intro>
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<para>Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_64_condsel" symboldefcount="1">
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<symbol link="sa_xm"><Xm></symbol>
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<account encodedin="Rm">
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<intro>
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<para>Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="CSINC_32_condsel, CSINC_64_condsel" symboldefcount="1">
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<symbol link="sa_cond"><cond></symbol>
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<account encodedin="cond">
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<intro>
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<para>Is one of the standard conditions, encoded in the "cond" field in the standard way.</para>
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</intro>
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</account>
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</explanation>
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</explanations>
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<aliastablehook anchor="aliasconditions">Alias Conditions</aliastablehook>
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<ps_section howmany="1">
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<ps name="aarch64/instrs/integer/conditional/select" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute">bits(datasize) result;
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if <a link="impl-shared.ConditionHolds.1" file="shared_pseudocode.xml" hover="function: boolean ConditionHolds(bits(4) cond)">ConditionHolds</a>(condition) then
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result = <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[n, datasize];
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else
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result = <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[m, datasize];
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if else_inv then result = NOT(result);
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if else_inc then result = result + 1;
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<a link="impl-aarch64.X.write.2" file="shared_pseudocode.xml" hover="accessor: X[integer n, integer width] = bits(width) value">X</a>[d, datasize] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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