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https://github.com/pound-emu/ballistic.git
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206 lines
10 KiB
XML
206 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="clasta_r_p_z" title="CLASTA (scalar)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="sve" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CLASTA" />
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</docvars>
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<heading>CLASTA (scalar)</heading>
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<desc>
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<brief>Conditionally extract element after last to general-purpose register</brief>
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<description>
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<para>From the source vector register extract the element after the last active element, or if the last active element is the final element extract element zero, and then zero-extend that element to destructively place in the destination and first source general-purpose register. If there are no active elements then destructively zero-extend the least significant element-size bits of the destination and first source general-purpose register.</para>
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</description>
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<status>Green</status>
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<predicated>True</predicated>
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<affected_by_sme output="general-purpose register" />
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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="SVE" oneof="1" id="iclass_sve" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="sve" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CLASTA" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="CLASTA-R.P.Z-_" tworows="1">
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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>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>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="5" settings="5">
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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>0</c>
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<c>0</c>
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</box>
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<box hibit="16" name="B" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="15" width="3" settings="3">
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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="12" width="3" name="Pg" usename="1">
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<c colspan="3"></c>
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</box>
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<box hibit="9" width="5" name="Zm" 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="Rdn" 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="clasta_r_p_z_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="instr-class" value="sve" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="CLASTA" />
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</docvars>
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<asmtemplate><text>CLASTA </text><a link="sa_r" hover="Width specifier (field "size") [W,X]"><R></a><a link="sa_dn" hover="Source and destination general-purpose register number [0-30] or ZR (31) (field "Rdn")"><dn></a><text>, </text><a link="sa_pg" hover="Governing scalable predicate register P0-P7 (field "Pg")"><Pg></a><text>, </text><a link="sa_r" hover="Width specifier (field "size") [W,X]"><R></a><a link="sa_dn" hover="Source and destination general-purpose register number [0-30] or ZR (31) (field "Rdn")"><dn></a><text>, </text><a link="sa_zm" hover="Source scalable vector register (field "Zm")"><Zm></a><text>.</text><a link="sa_t" hover="Size specifier (field "size") [B,D,H,S]"><T></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="CLASTA-R.P.Z-_" mylink="CLASTA-R.P.Z-_" enclabels="" sections="1" secttype="noheading">
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<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>() && !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</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 g = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pg);
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integer dn = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Rdn);
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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>(Zm);
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constant integer csize = if esize < 64 then 32 else 64;
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boolean isBefore = FALSE;</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="clasta_r_p_z_" symboldefcount="1">
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<symbol link="sa_r"><R></symbol>
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<definition encodedin="size">
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<intro>Is a width 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"><R></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">01</entry>
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<entry class="symbol">W</entry>
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</row>
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<row>
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<entry class="bitfield">x0</entry>
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<entry class="symbol">W</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">X</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="clasta_r_p_z_" symboldefcount="1">
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<symbol link="sa_dn"><dn></symbol>
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<account encodedin="Rdn">
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<intro>
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<para>Is the number [0-30] of the source and destination general-purpose register or the name ZR (31), encoded in the "Rdn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="clasta_r_p_z_" symboldefcount="1">
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<symbol link="sa_pg"><Pg></symbol>
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<account encodedin="Pg">
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<intro>
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<para>Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="clasta_r_p_z_" symboldefcount="1">
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<symbol link="sa_zm"><Zm></symbol>
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<account encodedin="Zm">
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<intro>
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<para>Is the name of the source scalable vector register, encoded in the "Zm" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="clasta_r_p_z_" 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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</explanations>
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<ps_section howmany="1">
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<ps name="CLASTA-R.P.Z-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckSVEEnabled()">CheckSVEEnabled</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) mask = <a link="impl-aarch64.P.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) P[integer n, integer width]">P</a>[g, PL];
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bits(esize) operand1 = <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[dn, esize];
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bits(VL) operand2 = <a link="impl-aarch64.Z.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) Z[integer n, integer width]">Z</a>[m, VL];
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bits(csize) result;
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integer last = <a link="impl-aarch64.LastActiveElement.2" file="shared_pseudocode.xml" hover="function: integer LastActiveElement(bits(N) mask, integer esize)">LastActiveElement</a>(mask, esize);
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if last < 0 then
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result = <a link="impl-shared.ZeroExtend.2" file="shared_pseudocode.xml" hover="function: bits(N) ZeroExtend(bits(M) x, integer N)">ZeroExtend</a>(operand1, csize);
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else
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if !isBefore then
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last = last + 1;
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if last >= elements then last = 0;
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result = <a link="impl-shared.ZeroExtend.2" file="shared_pseudocode.xml" hover="function: bits(N) ZeroExtend(bits(M) x, integer N)">ZeroExtend</a>(<a link="impl-shared.Elem.read.3" file="shared_pseudocode.xml" hover="accessor: bits(size) Elem[bits(N) vector, integer e, integer size]">Elem</a>[operand2, last, esize], csize);
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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>[dn, csize] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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