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https://github.com/pound-emu/ballistic.git
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218 lines
11 KiB
XML
218 lines
11 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="prfb_i_p_br" title="PRFB (scalar plus 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="PRFB" />
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<docvar key="sve-esize" value="esize-byte" />
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</docvars>
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<heading>PRFB (scalar plus scalar)</heading>
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<desc>
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<brief>Contiguous prefetch bytes (scalar index)</brief>
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<description>
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<para>Contiguous prefetch of byte elements from the memory address generated by a 64-bit scalar base and scalar index which is added to the base address. After each element prefetch the index value is incremented, but the index register is not updated.</para>
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<para>The predicate may be used to suppress prefetches from unwanted addresses.</para>
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</description>
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<status>Green</status>
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<predicated>True</predicated>
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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="PRFB" />
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<docvar key="sve-esize" value="esize-byte" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="PRFB-I.P.BR-S" tworows="1">
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<box hibit="31" width="7" settings="7">
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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>1</c>
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<c>0</c>
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</box>
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<box hibit="24" name="msz<1>" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="23" name="msz<0>" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="22" width="2" settings="2">
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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="3" settings="3">
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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="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="Rn" usename="1">
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<c colspan="5"></c>
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</box>
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<box hibit="4" settings="1">
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<c>0</c>
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</box>
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<box hibit="3" width="4" name="prfop" 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="prfb_i_p_br_s" 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="PRFB" />
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<docvar key="sve-esize" value="esize-byte" />
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</docvars>
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<asmtemplate><text>PRFB </text><a link="sa_prfop" hover="Prefetch operation specifier (field "prfop") [#uimm4,PLDL1KEEP,PLDL1STRM,PLDL2KEEP,PLDL2STRM,PLDL3KEEP,PLDL3STRM,PSTL1KEEP,PSTL1STRM,PSTL2KEEP,PSTL2STRM,PSTL3KEEP,PSTL3STRM]"><prfop></a><text>, </text><a link="sa_pg" hover="Governing scalable predicate register P0-P7 (field "Pg")"><Pg></a><text>, [</text><a link="sa_xn_sp" hover="64-bit general-purpose base register or SP (field "Rn")"><Xn|SP></a><text>, </text><a link="sa_xm" hover="64-bit general-purpose offset register (field "Rm")"><Xm></a><text>]</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="PRFB-I.P.BR-S" mylink="PRFB-I.P.BR-S" 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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if Rm == '11111' then UNDEFINED;
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constant integer esize = 8;
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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 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 level = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(prfop<2:1>);
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boolean stream = (prfop<0> == '1');
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pref_hint = if prfop<3> == '0' then <a link="Prefetch_READ" file="shared_pseudocode.xml" hover="enumeration PrefetchHint {Prefetch_READ, Prefetch_WRITE, Prefetch_EXEC}">Prefetch_READ</a> else <a link="Prefetch_WRITE" file="shared_pseudocode.xml" hover="enumeration PrefetchHint {Prefetch_READ, Prefetch_WRITE, Prefetch_EXEC}">Prefetch_WRITE</a>;
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integer scale = 0;</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="prfb_i_p_br_s" symboldefcount="1">
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<symbol link="sa_prfop"><prfop></symbol>
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<definition encodedin="prfop">
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<intro>Is the prefetch operation 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">prfop</entry>
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<entry class="symbol"><prfop></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">0000</entry>
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<entry class="symbol">PLDL1KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">0001</entry>
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<entry class="symbol">PLDL1STRM</entry>
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</row>
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<row>
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<entry class="bitfield">0010</entry>
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<entry class="symbol">PLDL2KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">0011</entry>
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<entry class="symbol">PLDL2STRM</entry>
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</row>
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<row>
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<entry class="bitfield">0100</entry>
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<entry class="symbol">PLDL3KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">0101</entry>
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<entry class="symbol">PLDL3STRM</entry>
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</row>
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<row>
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<entry class="bitfield">x11x</entry>
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<entry class="symbol">#uimm4</entry>
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</row>
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<row>
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<entry class="bitfield">1000</entry>
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<entry class="symbol">PSTL1KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">1001</entry>
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<entry class="symbol">PSTL1STRM</entry>
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</row>
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<row>
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<entry class="bitfield">1010</entry>
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<entry class="symbol">PSTL2KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">1011</entry>
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<entry class="symbol">PSTL2STRM</entry>
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</row>
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<row>
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<entry class="bitfield">1100</entry>
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<entry class="symbol">PSTL3KEEP</entry>
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</row>
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<row>
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<entry class="bitfield">1101</entry>
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<entry class="symbol">PSTL3STRM</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="prfb_i_p_br_s" 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="prfb_i_p_br_s" symboldefcount="1">
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<symbol link="sa_xn_sp"><Xn|SP></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 general-purpose base register or stack pointer, 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="prfb_i_p_br_s" 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 general-purpose offset 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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</explanations>
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<ps_section howmany="1">
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<ps name="PRFB-I.P.BR-S" 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(64) base;
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bits(64) offset;
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if <a link="impl-aarch64.AnyActiveElement.2" file="shared_pseudocode.xml" hover="function: boolean AnyActiveElement(bits(N) mask, integer esize)">AnyActiveElement</a>(mask, esize) then
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base = if n == 31 then <a link="impl-aarch64.SP.read.0" file="shared_pseudocode.xml" hover="accessor: bits(64) SP[]">SP</a>[] else <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[n, 64];
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offset = <a link="impl-aarch64.X.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) X[integer n, integer width]">X</a>[m, 64];
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for e = 0 to elements-1
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if <a link="impl-aarch64.ActivePredicateElement.3" file="shared_pseudocode.xml" hover="function: boolean ActivePredicateElement(bits(N) pred, integer e, integer esize)">ActivePredicateElement</a>(mask, e, esize) then
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integer eoff = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(offset) + e;
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bits(64) addr = base + (eoff << scale);
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<a link="impl-shared.Hint_Prefetch.4" file="shared_pseudocode.xml" hover="function: Hint_Prefetch(bits(64) address, PrefetchHint hint, integer target, boolean stream)">Hint_Prefetch</a>(addr, pref_hint, level, stream);</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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