mirror of
https://github.com/pound-emu/ballistic.git
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141 lines
7.2 KiB
XML
141 lines
7.2 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="brkn_p_p_pp" title="BRKN" type="instruction">
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<docvars>
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<docvar key="cond-setting" value="no-s" />
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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="BRKN" />
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</docvars>
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<heading>BRKN</heading>
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<desc>
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<brief>Propagate break to next partition</brief>
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<description>
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<para>If the last active element of the first source predicate is false then set the destination predicate to all-false. Otherwise leaves the destination and second source predicate unchanged. Does not set the condition flags.</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="Not setting the condition flags" oneof="1" id="iclass_no_s" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="cond-setting" value="no-s" />
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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="BRKN" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="BRKN-P.P.PP-_" tworows="1">
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<box hibit="31" width="9" settings="9">
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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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<c>0</c>
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</box>
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<box hibit="22" name="S" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="21" width="8" settings="8">
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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>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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</box>
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<box hibit="13" width="4" name="Pg" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="9" settings="1">
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<c>0</c>
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</box>
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<box hibit="8" width="4" name="Pn" usename="1">
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<c colspan="4"></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="Pdm" 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="brkn_p_p_pp_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="cond-setting" value="no-s" />
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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="BRKN" />
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</docvars>
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<asmtemplate><text>BRKN </text><a link="sa_pdm" hover="Second source and destination scalable predicate register (field "Pdm")"><Pdm></a><text>.B, </text><a link="sa_pg" hover="Governing scalable predicate register (field "Pg")"><Pg></a><text>/Z, </text><a link="sa_pn" hover="First source scalable predicate register (field "Pn")"><Pn></a><text>.B, </text><a link="sa_pdm" hover="Second source and destination scalable predicate register (field "Pdm")"><Pdm></a><text>.B</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="BRKN-P.P.PP-_" mylink="BRKN-P.P.PP-_" 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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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>(Pn);
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integer dm = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pdm);
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boolean setflags = 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="brkn_p_p_pp_" symboldefcount="1">
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<symbol link="sa_pdm"><Pdm></symbol>
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<account encodedin="Pdm">
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<intro>
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<para>Is the name of the second source and destination scalable predicate register, encoded in the "Pdm" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="brkn_p_p_pp_" 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, 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="brkn_p_p_pp_" symboldefcount="1">
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<symbol link="sa_pn"><Pn></symbol>
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<account encodedin="Pn">
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<intro>
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<para>Is the name of the first source scalable predicate register, encoded in the "Pn" 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="BRKN-P.P.PP-_" 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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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(PL) operand1 = <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) operand2 = <a link="impl-aarch64.P.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) P[integer n, integer width]">P</a>[dm, PL];
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bits(PL) result;
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if <a link="impl-aarch64.LastActive.3" file="shared_pseudocode.xml" hover="function: bit LastActive(bits(N) mask, bits(N) x, integer esize)">LastActive</a>(mask, operand1, 8) == '1' then
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result = operand2;
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else
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result = <a link="impl-shared.Zeros.1" file="shared_pseudocode.xml" hover="function: bits(N) Zeros(integer N)">Zeros</a>(PL);
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if setflags then
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PSTATE.<N,Z,C,V> = <a link="impl-aarch64.PredTest.3" file="shared_pseudocode.xml" hover="function: bits(4) PredTest(bits(N) mask, bits(N) result, integer esize)">PredTest</a>(<a link="impl-shared.Ones.1" file="shared_pseudocode.xml" hover="function: bits(N) Ones(integer N)">Ones</a>(PL), result, 8);
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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>[dm, PL] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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