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199 lines
10 KiB
XML
199 lines
10 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="UBFIZ_UBFM" title="UBFIZ -- A64" type="alias">
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<docvars>
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<docvar key="alias_mnemonic" value="UBFIZ" />
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<docvar key="bitfield-fill" value="zero-fill" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="UBFM" />
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<docvar key="source-type" value="src-is-immediate" />
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</docvars>
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<heading>UBFIZ</heading>
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<desc>
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<brief>
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<para>Unsigned Bitfield Insert in Zero</para>
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</brief>
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<authored>
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<para>Unsigned Bitfield Insert in Zeros copies a bitfield of <syntax><width></syntax> bits from the least significant bits of the source register to bit position <syntax><lsb></syntax> of the destination register, setting the destination bits above and below the bitfield to zero.</para>
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</authored>
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</desc>
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<operationalnotes>
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<para>If PSTATE.DIT is 1:</para>
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<list type="unordered">
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<listitem><content>The execution time of this instruction is independent of:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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<listitem><content>The response of this instruction to asynchronous exceptions does not vary based on:<list type="unordered"><listitem><content>The values of the data supplied in any of its registers.</content></listitem><listitem><content>The values of the NZCV flags.</content></listitem></list></content></listitem>
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</list>
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</operationalnotes>
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<aliasto refiform="ubfm.xml" iformid="UBFM">UBFM</aliasto>
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<classes>
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<iclass name="With zeros to left and right" oneof="1" id="iclass_zero_fill" no_encodings="2" isa="A64">
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<docvars>
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<docvar key="bitfield-fill" value="zero-fill" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="UBFM" />
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</docvars>
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<iclassintro count="2"></iclassintro>
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<regdiagram form="32" psname="aarch64/instrs/integer/bitfield" tworows="1">
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<box hibit="31" name="sf" usename="1">
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<c></c>
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</box>
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<box hibit="30" width="2" name="opc" usename="1" settings="2" psbits="xx">
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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="28" width="6" settings="6">
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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>1</c>
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<c>0</c>
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</box>
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<box hibit="22" name="N" usename="1">
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<c></c>
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</box>
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<box hibit="21" width="6" name="immr" usename="1">
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<c colspan="6"></c>
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</box>
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<box hibit="15" width="6" name="imms" usename="1">
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<c colspan="6"></c>
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</box>
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<box hibit="9" width="5" name="Rn" 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="Rd" 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="UBFIZ_UBFM_32M_bitfield" oneofinclass="2" oneof="2" label="32-bit" bitdiffs="sf == 0 && N == 0">
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<docvars>
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<docvar key="alias_mnemonic" value="UBFIZ" />
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<docvar key="bitfield-fill" value="zero-fill" />
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<docvar key="datatype" value="32" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="UBFM" />
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<docvar key="source-type" value="src-is-immediate" />
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</docvars>
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<box hibit="31" width="1" name="sf">
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<c>0</c>
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</box>
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<box hibit="22" width="1" name="N">
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<c>0</c>
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</box>
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<asmtemplate><text>UBFIZ </text><a link="sa_wd" hover="32-bit general-purpose destination register (field "Rd")"><Wd></a><text>, </text><a link="sa_wn" hover="32-bit general-purpose source register (field "Rn")"><Wn></a><text>, #</text><a link="sa_lsb" hover="Bit number of lsb of the destination bitfield [0-31]"><lsb></a><text>, #</text><a link="sa_width" hover="Width of bitfield [1-32-<lsb>]"><width></a></asmtemplate>
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<equivalent_to>
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<asmtemplate><a href="ubfm.xml#UBFM_32M_bitfield">UBFM</a><text> </text><a link="sa_wd" hover="32-bit general-purpose destination register (field "Rd")"><Wd></a><text>, </text><a link="sa_wn" hover="32-bit general-purpose source register (field "Rn")"><Wn></a><text>, #(-</text><a link="sa_lsb" hover="Bit number of lsb of the destination bitfield [0-31]"><lsb></a><text> MOD 32), #(</text><a link="sa_width" hover="Width of bitfield [1-32-<lsb>]"><width></a><text>-1)</text></asmtemplate>
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<aliascond><a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(imms) < <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(immr)</aliascond>
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</equivalent_to>
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</encoding>
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<encoding name="UBFIZ_UBFM_64M_bitfield" oneofinclass="2" oneof="2" label="64-bit" bitdiffs="sf == 1 && N == 1">
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<docvars>
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<docvar key="alias_mnemonic" value="UBFIZ" />
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<docvar key="bitfield-fill" value="zero-fill" />
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<docvar key="datatype" value="64" />
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<docvar key="instr-class" value="general" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="UBFM" />
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<docvar key="source-type" value="src-is-immediate" />
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</docvars>
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<box hibit="31" width="1" name="sf">
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<c>1</c>
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</box>
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<box hibit="22" width="1" name="N">
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<c>1</c>
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</box>
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<asmtemplate><text>UBFIZ </text><a link="sa_xd" hover="64-bit general-purpose destination register (field "Rd")"><Xd></a><text>, </text><a link="sa_xn" hover="64-bit general-purpose source register (field "Rn")"><Xn></a><text>, #</text><a link="sa_lsb_2" hover="Bit number of lsb of the destination bitfield [0-63]"><lsb></a><text>, #</text><a link="sa_width_1" hover="Width of bitfield [1-64-<lsb>]"><width></a></asmtemplate>
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<equivalent_to>
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<asmtemplate><a href="ubfm.xml#UBFM_64M_bitfield">UBFM</a><text> </text><a link="sa_xd" hover="64-bit general-purpose destination register (field "Rd")"><Xd></a><text>, </text><a link="sa_xn" hover="64-bit general-purpose source register (field "Rn")"><Xn></a><text>, #(-</text><a link="sa_lsb_2" hover="Bit number of lsb of the destination bitfield [0-63]"><lsb></a><text> MOD 64), #(</text><a link="sa_width_1" hover="Width of bitfield [1-64-<lsb>]"><width></a><text>-1)</text></asmtemplate>
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<aliascond><a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(imms) < <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(immr)</aliascond>
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</equivalent_to>
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</encoding>
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</iclass>
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</classes>
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<explanations scope="all">
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<explanation enclist="UBFIZ_UBFM_32M_bitfield" symboldefcount="1">
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<symbol link="sa_wd"><Wd></symbol>
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<account encodedin="Rd">
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<intro>
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<para>Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_32M_bitfield" symboldefcount="1">
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<symbol link="sa_wn"><Wn></symbol>
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<account encodedin="Rn">
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<intro>
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<para>Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_64M_bitfield" symboldefcount="1">
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<symbol link="sa_xd"><Xd></symbol>
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<account encodedin="Rd">
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<intro>
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<para>Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_64M_bitfield" symboldefcount="1">
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<symbol link="sa_xn"><Xn></symbol>
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<account encodedin="Rn">
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<intro>
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<para>Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_32M_bitfield" symboldefcount="1">
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<symbol link="sa_lsb"><lsb></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="datatype" value="32" />
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</docvars>
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<intro>
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<para>For the 32-bit variant: is the bit number of the lsb of the destination bitfield, in the range 0 to 31.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_64M_bitfield" symboldefcount="2">
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<symbol link="sa_lsb_2"><lsb></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="datatype" value="64" />
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</docvars>
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<intro>
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<para>For the 64-bit variant: is the bit number of the lsb of the destination bitfield, in the range 0 to 63.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_32M_bitfield" symboldefcount="1">
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<symbol link="sa_width"><width></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="datatype" value="32" />
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</docvars>
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<intro>
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<para>For the 32-bit variant: is the width of the bitfield, in the range 1 to 32-<lsb>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="UBFIZ_UBFM_64M_bitfield" symboldefcount="2">
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<symbol link="sa_width_1"><width></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="datatype" value="64" />
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</docvars>
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<intro>
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<para>For the 64-bit variant: is the width of the bitfield, in the range 1 to 64-<lsb>.</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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</instructionsection>
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