mirror of
https://github.com/pound-emu/ballistic.git
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132 lines
6.4 KiB
XML
132 lines
6.4 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="rdffrs_p_p_f" title="RDFFRS" type="instruction">
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<docvars>
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<docvar key="cond-setting" value="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="RDFFRS" />
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</docvars>
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<heading>RDFFRS</heading>
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<desc>
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<brief>Return predicate of succesfully loaded elements, setting the condition flags</brief>
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<description>
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<para>Read the first-fault register (<asm-code>FFR</asm-code>) and place active elements in the corresponding elements of the destination predicate. Inactive elements in the destination predicate register are set to zero. Sets the <arm-defined-word>First</arm-defined-word> (N), <arm-defined-word>None</arm-defined-word> (Z), <arm-defined-word>!Last</arm-defined-word> (C) condition flags based on the predicate result, and the V flag to zero.</para>
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<para>This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.</para>
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</description>
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<status>Green</status>
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<predicated>True</predicated>
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<uses_dit condition="FEAT_SVE2 is implemented or FEAT_SME is implemented">True</uses_dit>
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<sm_policy>SM_0_only</sm_policy>
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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="Setting the condition flags" oneof="1" id="iclass_s" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="cond-setting" value="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="RDFFRS" />
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</docvars>
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<iclassintro count="1"></iclassintro>
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<regdiagram form="32" psname="RDFFRS-P.P.F-_" 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>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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</box>
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<box hibit="23" name="op" settings="1">
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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>1</c>
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</box>
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<box hibit="21" width="12" settings="12">
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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>1</c>
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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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<c>0</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="Pg" 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="Pd" 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="rdffrs_p_p_f_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="cond-setting" value="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="RDFFRS" />
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</docvars>
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<asmtemplate><text>RDFFRS </text><a link="sa_pd" hover="Destination scalable predicate register (field "Pd")"><Pd></a><text>.B, </text><a link="sa_pg" hover="Governing scalable predicate register (field "Pg")"><Pg></a><text>/Z</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="RDFFRS-P.P.F-_" mylink="RDFFRS-P.P.F-_" 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>() 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 d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pd);
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boolean setflags = TRUE;</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="rdffrs_p_p_f_" symboldefcount="1">
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<symbol link="sa_pd"><Pd></symbol>
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<account encodedin="Pd">
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<intro>
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<para>Is the name of the destination scalable predicate register, encoded in the "Pd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="rdffrs_p_p_f_" 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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</explanations>
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<ps_section howmany="1">
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<ps name="RDFFRS-P.P.F-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckNonStreamingSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckNonStreamingSVEEnabled()">CheckNonStreamingSVEEnabled</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) ffr = <a link="impl-aarch64.FFR.read.1" file="shared_pseudocode.xml" hover="accessor: bits(width) FFR[integer width]">FFR</a>[PL];
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bits(PL) result = ffr AND mask;
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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>(mask, 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>[d, PL] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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