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150 lines
8.6 KiB
XML
150 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="zero_za_i" title="ZERO (tile)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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</docvars>
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<heading>ZERO (tile)</heading>
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<desc>
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<brief>Zero a list of 64-bit element ZA tiles</brief>
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<description>
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<para>Zeroes all bytes within each of the up to eight listed 64-bit element tiles named <asm-code>ZA0.D</asm-code> to <asm-code>ZA7.D</asm-code>, leaving the other 64-bit element tiles unmodified.</para>
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<para>This instruction does not require the PE to be in Streaming SVE mode, and it is expected that this instruction will not experience a significant slowdown due to contention with other PEs that are executing in Streaming SVE mode.</para>
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<para>For programmer convenience an assembler must also accept the names of 32-bit, 16-bit, and 8-bit element tiles which are converted into the corresponding set of 64-bit element tiles.</para>
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<para>In accordance with the architecturally defined mapping between different element size tiles:</para>
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<list type="unordered">
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<listitem>
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<content>Zeroing the 8-bit element tile name <asm-code>ZA0.B</asm-code>, or the entire array name <asm-code>ZA</asm-code>, is equivalent to zeroing all eight 64-bit element tiles named <asm-code>ZA0.D</asm-code> to <asm-code>ZA7.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 16-bit element tile name <asm-code>ZA0.H</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA0.D</asm-code>, <asm-code>ZA2.D</asm-code>, <asm-code>ZA4.D</asm-code>, and <asm-code>ZA6.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 16-bit element tile name <asm-code>ZA1.H</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA1.D</asm-code>, <asm-code>ZA3.D</asm-code>, <asm-code>ZA5.D</asm-code>, and <asm-code>ZA7.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 32-bit element tile name <asm-code>ZA0.S</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA0.D</asm-code> and <asm-code>ZA4.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 32-bit element tile name <asm-code>ZA1.S</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA1.D</asm-code> and <asm-code>ZA5.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 32-bit element tile name <asm-code>ZA2.S</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA2.D</asm-code> and <asm-code>ZA6.D</asm-code>.</content>
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</listitem>
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<listitem>
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<content>Zeroing the 32-bit element tile name <asm-code>ZA3.S</asm-code> is equivalent to zeroing 64-bit element tiles named <asm-code>ZA3.D</asm-code> and <asm-code>ZA7.D</asm-code>.</content>
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</listitem>
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</list>
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<para>The preferred disassembly of this instruction uses the shortest list of tile names that represent the encoded immediate mask.</para>
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<para>For example:</para>
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<list type="unordered">
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<listitem>
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<content>An immediate which encodes 64-bit element tiles <asm-code>ZA0.D</asm-code>, <asm-code>ZA1.D</asm-code>, <asm-code>ZA4.D</asm-code>, and <asm-code>ZA5.D</asm-code> is disassembled as {<asm-code>ZA0.S</asm-code>, <asm-code>ZA1.S</asm-code>}.</content>
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</listitem>
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<listitem>
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<content>An immediate which encodes 64-bit element tiles <asm-code>ZA0.D</asm-code>, <asm-code>ZA2.D</asm-code>, <asm-code>ZA4.D</asm-code>, and <asm-code>ZA6.D</asm-code> is disassembled as {<asm-code>ZA0.H</asm-code>}.</content>
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</listitem>
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<listitem>
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<content>An all-ones immediate is disassembled as {<asm-code>ZA</asm-code>}.</content>
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</listitem>
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<listitem>
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<content>An all-zeros immediate is disassembled as an empty list { }.</content>
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</listitem>
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</list>
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</description>
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<status>Green</status>
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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="SME" oneof="1" id="iclass_mortlach" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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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_SME" feature="FEAT_SME" />
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</arch_variants>
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<regdiagram form="32" psname="ZERO-ZA.I-_">
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<box hibit="31" width="22" settings="22">
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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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<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>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>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>0</c>
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</box>
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<box hibit="9" 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="7" width="8" name="imm8" usename="1">
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<c colspan="8"></c>
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</box>
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</regdiagram>
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<encoding name="zero_za_i_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="ZERO" />
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</docvars>
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<asmtemplate><text>ZERO </text><text>{</text><text> </text><a link="sa_mask" hover="List of up to eight 64-bit element tile names separated by commas (field "imm8")"><mask></a><text> </text><text>}</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="ZERO-ZA.I-_" mylink="ZERO-ZA.I-_" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
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bits(8) mask = imm8;
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constant integer esize = 64;</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="zero_za_i_" symboldefcount="1">
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<symbol link="sa_mask"><mask></symbol>
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<account encodedin="imm8">
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<intro>
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<para>Is a list of up to eight 64-bit element tile names separated by commas, encoded in the "imm8" 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="ZERO-ZA.I-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckSMEAndZAEnabled.0" file="shared_pseudocode.xml" hover="function: CheckSMEAndZAEnabled()">CheckSMEAndZAEnabled</a>();
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constant integer SVL = <a link="impl-aarch64.CurrentSVL.read.none" file="shared_pseudocode.xml" hover="accessor: integer CurrentSVL">CurrentSVL</a>;
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constant integer dim = SVL DIV esize;
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bits(dim*dim*esize) result = <a link="impl-shared.Zeros.1" file="shared_pseudocode.xml" hover="function: bits(N) Zeros(integer N)">Zeros</a>(dim*dim*esize);
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if <a link="impl-shared.HaveTME.0" file="shared_pseudocode.xml" hover="function: boolean HaveTME()">HaveTME</a>() && TSTATE.depth > 0 then
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<a link="impl-aarch64.FailTransaction.2" file="shared_pseudocode.xml" hover="function: FailTransaction(TMFailure cause, boolean retry)">FailTransaction</a>(<a link="TMFailure_ERR" file="shared_pseudocode.xml" hover="enumeration TMFailure { TMFailure_CNCL, TMFailure_DBG, TMFailure_ERR, TMFailure_NEST, TMFailure_SIZE, TMFailure_MEM, TMFailure_TRIVIAL, TMFailure_IMP }">TMFailure_ERR</a>, FALSE);
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for i = 0 to 7
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if mask<i> == '1' then <a link="impl-aarch64.ZAtile.write.3" file="shared_pseudocode.xml" hover="accessor: ZAtile[integer tile, integer esize, integer width] = bits(width) value">ZAtile</a>[i, esize, dim*dim*esize] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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