mirror of
https://github.com/pound-emu/ballistic.git
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146 lines
7.6 KiB
XML
146 lines
7.6 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="sqrshr_z_mz2" title="SQRSHR (two registers)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="SQRSHR" />
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</docvars>
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<heading>SQRSHR (two registers)</heading>
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<desc>
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<brief>Multi-vector signed saturating rounding shift right narrow by immediate</brief>
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<description>
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<para>Shift right by an immediate value, the signed integer value in each element of the two source vectors and place the rounded results in the half-width destination elements. Each result element is saturated to the half-width N-bit element's signed integer range -2<sup>(N-1)</sup> to (2<sup>(N-1)</sup>)-1. The immediate shift amount is an unsigned value in the range 1 to 16.</para>
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<para>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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<sm_policy>SM_1_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="SME2" oneof="1" id="iclass_mortlach2" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="SQRSHR" />
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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_SME2" feature="FEAT_SME2" />
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</arch_variants>
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<regdiagram form="32" psname="SQRSHR-Z.MZ2-_" tworows="1">
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<box hibit="31" width="11" settings="11">
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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>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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</box>
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<box hibit="20" name="op" settings="1">
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<c>0</c>
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</box>
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<box hibit="19" width="4" name="imm4" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="15" width="6" settings="6">
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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>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="9" width="4" name="Zn" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="5" name="U" usename="1" settings="1">
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<c>0</c>
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</box>
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<box hibit="4" width="5" name="Zd" 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="sqrshr_z_mz2_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="instr-class" value="mortlach2" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="SQRSHR" />
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</docvars>
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<asmtemplate><text>SQRSHR </text><a link="sa_zd" hover="Destination scalable vector register (field "Zd")"><Zd></a><text>.H, </text><text>{</text><text> </text><a link="sa_zn1" hover="First scalable vector register of a multi-vector sequence (field Zn)"><Zn1></a><text>.S-</text><a link="sa_zn2" hover="Second scalable vector register of a multi-vector sequence (field Zn)"><Zn2></a><text>.S </text><text>}</text><text>, #</text><a link="sa_const" hover="Immediate shift amount [1-16] (field "imm4")"><const></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="SQRSHR-Z.MZ2-_" mylink="SQRSHR-Z.MZ2-_" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME2.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME2()">HaveSME2</a>() then UNDEFINED;
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constant integer esize = 16;
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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:'0');
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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>(Zd);
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integer shift = esize - <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(imm4);</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="sqrshr_z_mz2_" symboldefcount="1">
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<symbol link="sa_zd"><Zd></symbol>
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<account encodedin="Zd">
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<intro>
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<para>Is the name of the destination scalable vector register, encoded in the "Zd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="sqrshr_z_mz2_" symboldefcount="1">
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<symbol link="sa_zn1"><Zn1></symbol>
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<account encodedin="Zn">
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<intro>
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<para>Is the name of the first scalable vector register of a multi-vector sequence, encoded as "Zn" times 2.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="sqrshr_z_mz2_" symboldefcount="1">
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<symbol link="sa_zn2"><Zn2></symbol>
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<account encodedin="Zn">
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<intro>
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<para>Is the name of the second scalable vector register of a multi-vector sequence, encoded as "Zn" times 2 plus 1.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="sqrshr_z_mz2_" symboldefcount="1">
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<symbol link="sa_const"><const></symbol>
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<account encodedin="imm4">
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<intro>
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<para>Is the immediate shift amount, in the range 1 to 16, encoded in the "imm4" 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="SQRSHR-Z.MZ2-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckStreamingSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckStreamingSVEEnabled()">CheckStreamingSVEEnabled</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 (2 * esize);
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bits(VL) result;
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integer round_const = 1 << (shift-1);
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for r = 0 to 1
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bits(VL) operand = <a link="impl-aarch64.Z.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) Z[integer n, integer width]">Z</a>[n+r, VL];
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for e = 0 to elements-1
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bits(2 * esize) element = <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>[operand, e, 2 * esize];
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integer res = (<a link="impl-shared.SInt.1" file="shared_pseudocode.xml" hover="function: integer SInt(bits(N) x)">SInt</a>(element) + round_const) >> 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, r*elements + e, esize] = <a link="impl-aarch32.SignedSat.2" file="shared_pseudocode.xml" hover="function: bits(N) SignedSat(integer i, integer N)">SignedSat</a>(res, esize);
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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>[d, VL] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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