mirror of
https://github.com/pound-emu/ballistic.git
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188 lines
9.2 KiB
XML
188 lines
9.2 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="usra_z_zi" title="USRA" 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="USRA" />
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</docvars>
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<heading>USRA</heading>
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<desc>
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<brief>Unsigned shift right and accumulate (immediate)</brief>
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<description>
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<para>Shift right by immediate each unsigned element of the source vector, inserting zeroes, and add the truncated intermediate result destructively to the corresponding elements of the addend vector. The immediate shift amount is an unsigned value in the range 1 to number of bits per element. This instruction is unpredicated.</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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<takes_movprfx>True</takes_movprfx>
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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="USRA" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="USRA-Z.ZI-_" 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>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>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="tszh" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="21" settings="1">
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<c>0</c>
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</box>
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<box hibit="20" width="2" name="tszl" usename="1">
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<c colspan="2"></c>
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</box>
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<box hibit="18" width="3" name="imm3" usename="1">
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<c colspan="3"></c>
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</box>
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<box hibit="15" width="4" settings="4">
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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="11" name="R" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" name="U" usename="1" settings="1">
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<c>1</c>
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</box>
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<box hibit="9" width="5" name="Zn" 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="Zda" 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="usra_z_zi_" 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="USRA" />
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</docvars>
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<asmtemplate><text>USRA </text><a link="sa_zda" hover="Third source and destination scalable vector register (field "Zda")"><Zda></a><text>.</text><a link="sa_t" hover="Size specifier (field "tszh:tszl") [B,D,H,S]"><T></a><text>, </text><a link="sa_zn" hover="First source scalable vector register (field "Zn")"><Zn></a><text>.</text><a link="sa_t" hover="Size specifier (field "tszh:tszl") [B,D,H,S]"><T></a><text>, #</text><a link="sa_const" hover="Immediate shift amount [1-number of bits per element] (field "tszh:tszl:imm3")"><const></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="USRA-Z.ZI-_" mylink="USRA-Z.ZI-_" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSVE2.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE2()">HaveSVE2</a>() && !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
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bits(4) tsize = tszh:tszl;
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integer esize;
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case tsize of
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when '0000' UNDEFINED;
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when '0001' esize = 8;
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when '001x' esize = 16;
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when '01xx' esize = 32;
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when '1xxx' esize = 64;
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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>(Zn);
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integer da = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zda);
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integer shift = (2 * esize) - <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(tsize:imm3);</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="usra_z_zi_" symboldefcount="1">
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<symbol link="sa_zda"><Zda></symbol>
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<account encodedin="Zda">
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<intro>
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<para>Is the name of the third source and destination scalable vector register, encoded in the "Zda" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="usra_z_zi_" symboldefcount="1">
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<symbol link="sa_t"><T></symbol>
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<definition encodedin="tszh:tszl">
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<intro>Is the size specifier, </intro>
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<table class="valuetable">
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<tgroup cols="3">
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<thead>
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<row>
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<entry class="bitfield">tszh</entry>
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<entry class="bitfield">tszl</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="bitfield">00</entry>
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<entry class="symbol">RESERVED</entry>
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</row>
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<row>
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<entry class="bitfield">00</entry>
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<entry class="bitfield">01</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">00</entry>
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<entry class="bitfield">1x</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">01</entry>
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<entry class="bitfield">xx</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">1x</entry>
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<entry class="bitfield">xx</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="usra_z_zi_" symboldefcount="1">
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<symbol link="sa_zn"><Zn></symbol>
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<account encodedin="Zn">
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<intro>
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<para>Is the name of the first source scalable vector register, encoded in the "Zn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="usra_z_zi_" symboldefcount="1">
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<symbol link="sa_const"><const></symbol>
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<account encodedin="imm3:tszh:tszl">
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<intro>
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<para>Is the immediate shift amount, in the range 1 to number of bits per element, encoded in "tszh:tszl:imm3".</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="USRA-Z.ZI-_" 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 elements = VL DIV esize;
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bits(VL) operand1 = <a link="impl-aarch64.Z.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) Z[integer n, integer width]">Z</a>[n, VL];
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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>[da, VL];
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bits(VL) result;
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for e = 0 to elements-1
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integer element = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</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>[operand1, e, esize]) >> shift;
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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, esize] = <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, e, esize] + element<esize-1:0>;
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<a link="impl-aarch64.Z.write.2" file="shared_pseudocode.xml" hover="accessor: Z[integer n, integer width] = bits(width) value">Z</a>[da, VL] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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