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https://github.com/pound-emu/ballistic.git
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176 lines
8.6 KiB
XML
176 lines
8.6 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="pext_pn_rr" title="PEXT (predicate)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="sve2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="PEXT" />
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</docvars>
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<heading>PEXT (predicate)</heading>
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<desc>
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<brief>Set predicate from predicate-as-counter</brief>
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<description>
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<para>Expands the source predicate-as-counter into a four-predicate wide mask and copies one quarter of it into the destination predicate register.</para>
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</description>
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<status>Green</status>
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<predicated>False</predicated>
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<uses_dit condition="FEAT_SVE2 is implemented or FEAT_SME is implemented">True</uses_dit>
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</desc>
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<alias_list howmany="0"></alias_list>
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<classes>
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<iclass name="SVE2" oneof="1" id="iclass_sve2" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="sve2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="PEXT" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<arch_variants>
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<arch_variant name="FEAT_SVE2p1" feature="FEAT_SVE2p1" />
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</arch_variants>
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<regdiagram form="32" psname="PEXT-PN.RR-_">
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<box hibit="31" width="8" settings="8">
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<c>0</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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<c>1</c>
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<c>0</c>
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<c>1</c>
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</box>
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<box hibit="23" width="2" name="size" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="21" width="11" settings="11">
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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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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>0</c>
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<c>1</c>
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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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</box>
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<box hibit="10" settings="1">
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<c>0</c>
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</box>
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<box hibit="9" width="2" name="imm2" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="7" width="3" name="PNn" usename="1">
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<c colspan="3"></c>
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</box>
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<box hibit="4" settings="1">
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<c>1</c>
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</box>
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<box hibit="3" width="4" name="Pd" usename="1">
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<c colspan="4"></c>
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</box>
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</regdiagram>
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<encoding name="pext_pn_rr_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="instr-class" value="sve2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="PEXT" />
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</docvars>
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<asmtemplate><text>PEXT </text><a link="sa_pd" hover="Destination scalable predicate register (field "Pd")"><Pd></a><text>.</text><a link="sa_t" hover="Size specifier (field "size") [B,D,H,S]"><T></a><text>, </text><a link="sa_pnn" hover="First source scalable predicate register PN8-PN15 (field "PNn")"><PNn></a><text>[</text><a link="sa_imm" hover="Element index [0-3] (field "imm2")"><imm></a><text>]</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="PEXT-PN.RR-_" mylink="PEXT-PN.RR-_" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME2.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME2()">HaveSME2</a>() && !<a link="impl-aarch64.HaveSVE2p1.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE2p1()">HaveSVE2p1</a>() then UNDEFINED;
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constant integer esize = 8 << <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(size);
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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>('1':PNn);
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integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pd);
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integer part = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(imm2);</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="pext_pn_rr_" symboldefcount="1">
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<symbol link="sa_pd"><Pd></symbol>
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<account encodedin="Pd">
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<intro>
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<para>Is the name of the destination scalable predicate register, encoded in the "Pd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="pext_pn_rr_" symboldefcount="1">
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<symbol link="sa_t"><T></symbol>
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<definition encodedin="size">
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<intro>Is the size specifier, </intro>
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<table class="valuetable">
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<tgroup cols="2">
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<thead>
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<row>
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<entry class="bitfield">size</entry>
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<entry class="symbol"><T></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry class="bitfield">00</entry>
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<entry class="symbol">B</entry>
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</row>
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<row>
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<entry class="bitfield">01</entry>
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<entry class="symbol">H</entry>
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</row>
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<row>
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<entry class="bitfield">10</entry>
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<entry class="symbol">S</entry>
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</row>
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<row>
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<entry class="bitfield">11</entry>
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<entry class="symbol">D</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</definition>
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</explanation>
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<explanation enclist="pext_pn_rr_" symboldefcount="1">
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<symbol link="sa_pnn"><PNn></symbol>
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<account encodedin="PNn">
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<intro>
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<para>Is the name of the first source scalable predicate register PN8-PN15, with predicate-as-counter encoding, encoded in the "PNn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="pext_pn_rr_" symboldefcount="1">
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<symbol link="sa_imm"><imm></symbol>
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<account encodedin="imm2">
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<intro>
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<para>Is the element index, in the range 0 to 3, encoded in the "imm2" field.</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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<ps_section howmany="1">
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<ps name="PEXT-PN.RR-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute">if <a link="impl-aarch64.HaveSVE2p1.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE2p1()">HaveSVE2p1</a>() then <a link="impl-aarch64.CheckSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckSVEEnabled()">CheckSVEEnabled</a>(); else <a link="impl-aarch64.CheckStreamingSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckStreamingSVEEnabled()">CheckStreamingSVEEnabled</a>();
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constant integer VL = <a link="impl-aarch64.CurrentVL.read.none" file="shared_pseudocode.xml" hover="accessor: integer CurrentVL">CurrentVL</a>;
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constant integer PL = VL DIV 8;
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constant integer elements = VL DIV esize;
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bits(PL) pred = <a link="impl-aarch64.P.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) P[integer n, integer width]">P</a>[n, PL];
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bits(PL*4) mask = <a link="impl-aarch64.CounterToPredicate.2" file="shared_pseudocode.xml" hover="function: bits(width) CounterToPredicate(bits(16) pred, integer width)">CounterToPredicate</a>(pred<15:0>, PL*4);
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bits(PL) result;
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constant integer psize = esize DIV 8;
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for e = 0 to elements-1
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bit pbit = <a link="impl-aarch64.PredicateElement.3" file="shared_pseudocode.xml" hover="function: bit PredicateElement(bits(N) pred, integer e, integer esize)">PredicateElement</a>(mask, part * elements + e, esize);
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<a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &vector, integer e, integer size] = bits(size) value">Elem</a>[result, e, psize] = <a link="impl-shared.ZeroExtend.2" file="shared_pseudocode.xml" hover="function: bits(N) ZeroExtend(bits(M) x, integer N)">ZeroExtend</a>(pbit, psize);
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<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] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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