slonik/specs/vcmpe.xml

682 lines
36 KiB
XML

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" encoding="UTF-8" href="iform.xsl" version="1.0"?>
<!DOCTYPE instructionsection PUBLIC "-//ARM//DTD instructionsection //EN" "iform-p.dtd">
<!-- Copyright (c) 2010-2022 Arm Limited or its affiliates. All rights reserved. -->
<!-- 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. -->
<instructionsection id="VCMPE" title="VCMPE -- AArch32" type="instruction">
<docvars>
<docvar key="instr-class" value="fpsimd" />
<docvar key="mnemonic" value="VCMPE" />
</docvars>
<heading>VCMPE</heading>
<desc>
<brief>
<para>Vector Compare, raising Invalid Operation on NaN</para>
</brief>
<authored>
<para>Vector Compare, raising Invalid Operation on NaN compares two floating-point registers, or one floating-point register and zero. It writes the result to the <xref linkend="AArch32.fpscr">FPSCR</xref> flags. These are normally transferred to the <xref linkend="BEIDIGBH">PSTATE</xref>.{N, Z, C, V} Condition flags by a subsequent <instruction>VMRS</instruction> instruction.</para>
<para>This instruction raises an Invalid Operation floating-point exception if either or both of the operands is any type of NaN.</para>
<para>Depending on settings in the <xref linkend="AArch32.cpacr">CPACR</xref>, <xref linkend="AArch32.nsacr">NSACR</xref>, and <xref linkend="AArch32.hcptr">HCPTR</xref> registers, and the Security state and PE mode in which the instruction is executed, an attempt to execute the instruction might be <arm-defined-word>undefined</arm-defined-word>, or trapped to Hyp mode. For more information see <xref linkend="CIHIDDFF">Enabling Advanced SIMD and floating-point support</xref>.</para>
</authored>
<encodingnotes>
<para>For more information about the <arm-defined-word>constrained unpredictable</arm-defined-word> behavior of this instruction, see <xref linkend="CJAEGDJC">Architectural Constraints on UNPREDICTABLE behaviors</xref>.</para>
</encodingnotes>
</desc>
<operationalnotes>
<para>The IEEE 754 standard specifies that the result of a comparison is precisely one of &lt;, ==, &gt; or unordered. If either or both of the operands is a NaN, they are unordered, and all three of (Operand1 &lt; Operand2), (Operand1 == Operand2) and (Operand1 &gt; Operand2) are false. An unordered comparison sets the <xref linkend="AArch32.fpscr">FPSCR</xref> condition flags to N=0, Z=0, C=1, and V=1.</para>
</operationalnotes>
<alias_list howmany="0"></alias_list>
<classes>
<classesintro count="4">
<txt>It has encodings from the following instruction sets:</txt>
<txt> A32 (</txt>
<a href="#iclass_a1">A1</a>
<txt> and </txt>
<a href="#iclass_a2">A2</a>
<txt>)</txt>
<txt> and </txt>
<txt> T32 (</txt>
<a href="#iclass_t1">T1</a>
<txt> and </txt>
<a href="#iclass_t2">T2</a>
<txt>)</txt>
<txt>.</txt>
</classesintro>
<iclass name="A1" oneof="4" id="iclass_a1" no_encodings="3" isa="A32">
<docvars>
<docvar key="armarmheading" value="A1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="32" psname="aarch32/instrs/VCMP/A1_A.txt" tworows="1">
<box hibit="31" width="4" name="cond" usename="1" settings="4" constraint="!= 1111">
<c colspan="4">!= 1111</c>
</box>
<box hibit="27" width="5" settings="5">
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" width="2" settings="2">
<c>1</c>
<c>1</c>
</box>
<box hibit="19" name="o1" settings="1">
<c>0</c>
</box>
<box hibit="18" width="3" name="opc2" settings="3">
<c>1</c>
<c>0</c>
<c>0</c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="size" usename="1">
<c colspan="2"></c>
</box>
<box hibit="7" name="E" usename="1" settings="1">
<c>1</c>
</box>
<box hibit="6" settings="1">
<c>1</c>
</box>
<box hibit="5" name="M" usename="1">
<c></c>
</box>
<box hibit="4" settings="1">
<c>0</c>
</box>
<box hibit="3" width="4" name="Vm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VCMPE_A1_H" oneofinclass="3" oneof="12" label="Half-precision scalar" bitdiffs="size == 01">
<docvars>
<docvar key="armarmheading" value="A1" />
<docvar key="fpdatasize" value="halfprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-halfprec" />
</docvars>
<arch_variants>
<arch_variant name="ARMv8.2" feature="FEAT_FP16" />
</arch_variants>
<box hibit="9" width="2" name="size">
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F16 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, </text><a link="sa_sm" hover="32-bit SIMD&amp;FP source register (field &quot;Vm:M&quot;)">&lt;Sm&gt;</a></asmtemplate>
</encoding>
<encoding name="VCMPE_A1_S" oneofinclass="3" oneof="12" label="Single-precision scalar" bitdiffs="size == 10">
<docvars>
<docvar key="armarmheading" value="A1" />
<docvar key="fpdatasize" value="singleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-singleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>0</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F32 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, </text><a link="sa_sm" hover="32-bit SIMD&amp;FP source register (field &quot;Vm:M&quot;)">&lt;Sm&gt;</a></asmtemplate>
</encoding>
<encoding name="VCMPE_A1_D" oneofinclass="3" oneof="12" label="Double-precision scalar" bitdiffs="size == 11">
<docvars>
<docvar key="armarmheading" value="A1" />
<docvar key="fpdatasize" value="doubleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-doubleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F64 </text><a link="sa_dd" hover="64-bit SIMD&amp;FP destination register (field &quot;D:Vd&quot;)">&lt;Dd&gt;</a><text>, </text><a link="sa_dm" hover="64-bit SIMD&amp;FP source register (field &quot;M:Vm&quot;)">&lt;Dm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VCMP/A1_A.txt" mylink="aarch32.instrs.VCMP.A1_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '00' || (size == '01' &amp;&amp; !<a link="impl-shared.HaveFP16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveFP16Ext()">HaveFP16Ext</a>()) then UNDEFINED;
if size == '01' &amp;&amp; cond != '1110' then UNPREDICTABLE;
quiet_nan_exc = (E == '1'); with_zero = FALSE;
integer esize;
integer d;
integer m;
case size of
when '01' esize = 16; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vm:M);
when '10' esize = 32; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vm:M);
when '11' esize = 64; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="A1" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">size == '01' &amp;&amp; cond != '1110'</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type>
<cu_type_text>The instruction executes as if it passes the Condition code check.</cu_type_text>
</cu_type>
<cu_type>
<cu_type_text>The instruction executes as NOP. This means it behaves as if it fails the Condition code check.</cu_type_text>
</cu_type>
<arch_variants>
<arch_variant name="ARMv8.2-A" />
</arch_variants>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="A2" oneof="4" id="iclass_a2" no_encodings="3" isa="A32">
<docvars>
<docvar key="armarmheading" value="A2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="32" psname="aarch32/instrs/VCMP/A2_A.txt" tworows="1">
<box hibit="31" width="4" name="cond" usename="1" settings="4" constraint="!= 1111">
<c colspan="4">!= 1111</c>
</box>
<box hibit="27" width="5" settings="5">
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" width="2" settings="2">
<c>1</c>
<c>1</c>
</box>
<box hibit="19" name="o1" settings="1">
<c>0</c>
</box>
<box hibit="18" width="3" name="opc2" settings="3">
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="size" usename="1">
<c colspan="2"></c>
</box>
<box hibit="7" name="E" usename="1" settings="1">
<c>1</c>
</box>
<box hibit="6" settings="1">
<c>1</c>
</box>
<box hibit="5" name="M" settings="1">
<c>(0)</c>
</box>
<box hibit="4" settings="1">
<c>0</c>
</box>
<box hibit="3" width="4" name="Vm" settings="4">
<c>(0)</c>
<c>(0)</c>
<c>(0)</c>
<c>(0)</c>
</box>
</regdiagram>
<encoding name="VCMPE_A2_H" oneofinclass="3" oneof="12" label="Half-precision scalar" bitdiffs="size == 01">
<docvars>
<docvar key="armarmheading" value="A2" />
<docvar key="fpdatasize" value="halfprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-halfprec" />
</docvars>
<arch_variants>
<arch_variant name="ARMv8.2" feature="FEAT_FP16" />
</arch_variants>
<box hibit="9" width="2" name="size">
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F16 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<encoding name="VCMPE_A2_S" oneofinclass="3" oneof="12" label="Single-precision scalar" bitdiffs="size == 10">
<docvars>
<docvar key="armarmheading" value="A2" />
<docvar key="fpdatasize" value="singleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-singleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>0</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F32 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<encoding name="VCMPE_A2_D" oneofinclass="3" oneof="12" label="Double-precision scalar" bitdiffs="size == 11">
<docvars>
<docvar key="armarmheading" value="A2" />
<docvar key="fpdatasize" value="doubleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="A32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-doubleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F64 </text><a link="sa_dd" hover="64-bit SIMD&amp;FP destination register (field &quot;D:Vd&quot;)">&lt;Dd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VCMP/A2_A.txt" mylink="aarch32.instrs.VCMP.A2_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '00' || (size == '01' &amp;&amp; !<a link="impl-shared.HaveFP16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveFP16Ext()">HaveFP16Ext</a>()) then UNDEFINED;
if size == '01' &amp;&amp; cond != '1110' then UNPREDICTABLE;
quiet_nan_exc = (E == '1'); with_zero = TRUE;
integer esize;
integer d;
case size of
when '01' esize = 16; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D);
when '10' esize = 32; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D);
when '11' esize = 64; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd);</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="A2" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">size == '01' &amp;&amp; cond != '1110'</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type>
<cu_type_text>The instruction executes as if it passes the Condition code check.</cu_type_text>
</cu_type>
<cu_type>
<cu_type_text>The instruction executes as NOP. This means it behaves as if it fails the Condition code check.</cu_type_text>
</cu_type>
<arch_variants>
<arch_variant name="ARMv8.2-A" />
</arch_variants>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="T1" oneof="4" id="iclass_t1" no_encodings="3" isa="T32">
<docvars>
<docvar key="armarmheading" value="T1" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="16x2" psname="aarch32/instrs/VCMP/T1_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" width="2" settings="2">
<c>1</c>
<c>1</c>
</box>
<box hibit="19" name="o1" settings="1">
<c>0</c>
</box>
<box hibit="18" width="3" name="opc2" settings="3">
<c>1</c>
<c>0</c>
<c>0</c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="size" usename="1">
<c colspan="2"></c>
</box>
<box hibit="7" name="E" usename="1" settings="1">
<c>1</c>
</box>
<box hibit="6" settings="1">
<c>1</c>
</box>
<box hibit="5" name="M" usename="1">
<c></c>
</box>
<box hibit="4" settings="1">
<c>0</c>
</box>
<box hibit="3" width="4" name="Vm" usename="1">
<c colspan="4"></c>
</box>
</regdiagram>
<encoding name="VCMPE_T1_H" oneofinclass="3" oneof="12" label="Half-precision scalar" bitdiffs="size == 01">
<docvars>
<docvar key="armarmheading" value="T1" />
<docvar key="fpdatasize" value="halfprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-halfprec" />
</docvars>
<arch_variants>
<arch_variant name="ARMv8.2" feature="FEAT_FP16" />
</arch_variants>
<box hibit="9" width="2" name="size">
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F16 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, </text><a link="sa_sm" hover="32-bit SIMD&amp;FP source register (field &quot;Vm:M&quot;)">&lt;Sm&gt;</a></asmtemplate>
</encoding>
<encoding name="VCMPE_T1_S" oneofinclass="3" oneof="12" label="Single-precision scalar" bitdiffs="size == 10">
<docvars>
<docvar key="armarmheading" value="T1" />
<docvar key="fpdatasize" value="singleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-singleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>0</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F32 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, </text><a link="sa_sm" hover="32-bit SIMD&amp;FP source register (field &quot;Vm:M&quot;)">&lt;Sm&gt;</a></asmtemplate>
</encoding>
<encoding name="VCMPE_T1_D" oneofinclass="3" oneof="12" label="Double-precision scalar" bitdiffs="size == 11">
<docvars>
<docvar key="armarmheading" value="T1" />
<docvar key="fpdatasize" value="doubleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-doubleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F64 </text><a link="sa_dd" hover="64-bit SIMD&amp;FP destination register (field &quot;D:Vd&quot;)">&lt;Dd&gt;</a><text>, </text><a link="sa_dm" hover="64-bit SIMD&amp;FP source register (field &quot;M:Vm&quot;)">&lt;Dm&gt;</a></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VCMP/T1_A.txt" mylink="aarch32.instrs.VCMP.T1_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '00' || (size == '01' &amp;&amp; !<a link="impl-shared.HaveFP16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveFP16Ext()">HaveFP16Ext</a>()) then UNDEFINED;
if size == '01' &amp;&amp; <a link="impl-aarch32.InITBlock.0" file="shared_pseudocode.xml" hover="function: boolean InITBlock()">InITBlock</a>() then UNPREDICTABLE;
quiet_nan_exc = (E == '1'); with_zero = FALSE;
integer esize;
integer d;
integer m;
case size of
when '01' esize = 16; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vm:M);
when '10' esize = 32; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vm:M);
when '11' esize = 64; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd); m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="T1" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">size == '01' &amp;&amp; InITBlock()</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type>
<cu_type_text>The instruction executes as if it passes the Condition code check.</cu_type_text>
</cu_type>
<cu_type>
<cu_type_text>The instruction executes as NOP. This means it behaves as if it fails the Condition code check.</cu_type_text>
</cu_type>
<arch_variants>
<arch_variant name="ARMv8.2-A" />
</arch_variants>
</cu_case>
</constrained_unpredictables>
</iclass>
<iclass name="T2" oneof="4" id="iclass_t2" no_encodings="3" isa="T32">
<docvars>
<docvar key="armarmheading" value="T2" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
</docvars>
<iclassintro count="3"></iclassintro>
<regdiagram form="16x2" psname="aarch32/instrs/VCMP/T2_A.txt" tworows="1">
<box hibit="31" width="9" settings="9">
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
<c>1</c>
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="22" name="D" usename="1">
<c></c>
</box>
<box hibit="21" width="2" settings="2">
<c>1</c>
<c>1</c>
</box>
<box hibit="19" name="o1" settings="1">
<c>0</c>
</box>
<box hibit="18" width="3" name="opc2" settings="3">
<c>1</c>
<c>0</c>
<c>1</c>
</box>
<box hibit="15" width="4" name="Vd" usename="1">
<c colspan="4"></c>
</box>
<box hibit="11" width="2" settings="2">
<c>1</c>
<c>0</c>
</box>
<box hibit="9" width="2" name="size" usename="1">
<c colspan="2"></c>
</box>
<box hibit="7" name="E" usename="1" settings="1">
<c>1</c>
</box>
<box hibit="6" settings="1">
<c>1</c>
</box>
<box hibit="5" name="M" settings="1">
<c>(0)</c>
</box>
<box hibit="4" settings="1">
<c>0</c>
</box>
<box hibit="3" width="4" name="Vm" settings="4">
<c>(0)</c>
<c>(0)</c>
<c>(0)</c>
<c>(0)</c>
</box>
</regdiagram>
<encoding name="VCMPE_T2_H" oneofinclass="3" oneof="12" label="Half-precision scalar" bitdiffs="size == 01">
<docvars>
<docvar key="armarmheading" value="T2" />
<docvar key="fpdatasize" value="halfprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-halfprec" />
</docvars>
<arch_variants>
<arch_variant name="ARMv8.2" feature="FEAT_FP16" />
</arch_variants>
<box hibit="9" width="2" name="size">
<c>0</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F16 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<encoding name="VCMPE_T2_S" oneofinclass="3" oneof="12" label="Single-precision scalar" bitdiffs="size == 10">
<docvars>
<docvar key="armarmheading" value="T2" />
<docvar key="fpdatasize" value="singleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-singleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>0</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F32 </text><a link="sa_sd" hover="32-bit SIMD&amp;FP destination register (field &quot;Vd:D&quot;)">&lt;Sd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<encoding name="VCMPE_T2_D" oneofinclass="3" oneof="12" label="Double-precision scalar" bitdiffs="size == 11">
<docvars>
<docvar key="armarmheading" value="T2" />
<docvar key="fpdatasize" value="doubleprec" />
<docvar key="instr-class" value="fpsimd" />
<docvar key="isa" value="T32" />
<docvar key="mnemonic" value="VCMPE" />
<docvar key="mnemonic-fpdatasize" value="VCMPE-doubleprec" />
</docvars>
<box hibit="9" width="2" name="size">
<c>1</c>
<c>1</c>
</box>
<asmtemplate><text>VCMPE</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;c&gt;</a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}">&lt;q&gt;</a><text>}</text><text>.F64 </text><a link="sa_dd" hover="64-bit SIMD&amp;FP destination register (field &quot;D:Vd&quot;)">&lt;Dd&gt;</a><text>, #0.0</text></asmtemplate>
</encoding>
<ps_section howmany="1">
<ps name="aarch32/instrs/VCMP/T2_A.txt" mylink="aarch32.instrs.VCMP.T2_A.txt" enclabels="" sections="1" secttype="noheading">
<pstext mayhavelinks="1" section="Decode" rep_section="decode">if size == '00' || (size == '01' &amp;&amp; !<a link="impl-shared.HaveFP16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveFP16Ext()">HaveFP16Ext</a>()) then UNDEFINED;
if size == '01' &amp;&amp; <a link="impl-aarch32.InITBlock.0" file="shared_pseudocode.xml" hover="function: boolean InITBlock()">InITBlock</a>() then UNPREDICTABLE;
quiet_nan_exc = (E == '1'); with_zero = TRUE;
integer esize;
integer d;
case size of
when '01' esize = 16; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D);
when '10' esize = 32; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Vd:D);
when '11' esize = 64; d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(D:Vd);</pstext>
</ps>
</ps_section>
<constrained_unpredictables encoding="T2" ps_block="Decode">
<cu_case>
<cu_cause>
<pstext mayhavelinks="1">size == '01' &amp;&amp; InITBlock()</pstext>
</cu_cause>
<cu_type constraint="Constraint_UNDEF" />
<cu_type>
<cu_type_text>The instruction executes as if it passes the Condition code check.</cu_type_text>
</cu_type>
<cu_type>
<cu_type_text>The instruction executes as NOP. This means it behaves as if it fails the Condition code check.</cu_type_text>
</cu_type>
<arch_variants>
<arch_variant name="ARMv8.2-A" />
</arch_variants>
</cu_case>
</constrained_unpredictables>
</iclass>
</classes>
<explanations scope="all">
<explanation enclist="VCMPE_A1_H, VCMPE_A2_H, VCMPE_T1_H, VCMPE_T2_H" symboldefcount="1">
<symbol link="sa_c">&lt;c&gt;</symbol>
<account encodedin="">
<intro>
<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
</intro>
</account>
</explanation>
<explanation enclist="VCMPE_A1_H, VCMPE_A2_H, VCMPE_T1_H, VCMPE_T2_H" symboldefcount="1">
<symbol link="sa_q">&lt;q&gt;</symbol>
<account encodedin="">
<intro>
<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
</intro>
</account>
</explanation>
<explanation enclist="VCMPE_A1_H, VCMPE_A2_H, VCMPE_T1_H, VCMPE_T2_H" symboldefcount="1">
<symbol link="sa_sd">&lt;Sd&gt;</symbol>
<account encodedin="Vd:D">
<intro>
<para>Is the 32-bit name of the SIMD&amp;FP destination register, encoded in the "Vd:D" field.</para>
</intro>
</account>
</explanation>
<explanation enclist="VCMPE_A1_H, VCMPE_T1_H" symboldefcount="1">
<symbol link="sa_sm">&lt;Sm&gt;</symbol>
<account encodedin="Vm:M">
<intro>
<para>Is the 32-bit name of the SIMD&amp;FP source register, encoded in the "Vm:M" field.</para>
</intro>
</account>
</explanation>
<explanation enclist="VCMPE_A1_D, VCMPE_A2_D, VCMPE_T1_D, VCMPE_T2_D" symboldefcount="1">
<symbol link="sa_dd">&lt;Dd&gt;</symbol>
<account encodedin="D:Vd">
<intro>
<para>Is the 64-bit name of the SIMD&amp;FP destination register, encoded in the "D:Vd" field.</para>
</intro>
</account>
</explanation>
<explanation enclist="VCMPE_A1_D, VCMPE_T1_D" symboldefcount="1">
<symbol link="sa_dm">&lt;Dm&gt;</symbol>
<account encodedin="M:Vm">
<intro>
<para>Is the 64-bit name of the SIMD&amp;FP source register, encoded in the "M:Vm" field.</para>
</intro>
</account>
</explanation>
</explanations>
<ps_section howmany="1">
<ps name="aarch32/instrs/VCMP/Op_A.txt" mylink="execute" enclabels="" sections="1" secttype="Operation">
<pstext mayhavelinks="1" section="Execute" rep_section="execute">if <a link="impl-aarch32.ConditionPassed.0" file="shared_pseudocode.xml" hover="function: boolean ConditionPassed()">ConditionPassed</a>() then
EncodingSpecificOperations(); <a link="impl-aarch32.CheckVFPEnabled.1" file="shared_pseudocode.xml" hover="function: CheckVFPEnabled(boolean include_fpexc_check)">CheckVFPEnabled</a>(TRUE);
bits(4) nzcv;
case esize of
when 16
bits(16) op16 = if with_zero then <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 16) else <a link="impl-aarch32.S.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) S[integer n]">S</a>[m]&lt;15:0&gt;;
nzcv = <a link="impl-shared.FPCompare.4" file="shared_pseudocode.xml" hover="function: bits(4) FPCompare(bits(N) op1, bits(N) op2, boolean signal_nans, FPCRType fpcr)">FPCompare</a>(<a link="impl-aarch32.S.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) S[integer n]">S</a>[d]&lt;15:0&gt;, op16, quiet_nan_exc, FPSCR[]);
when 32
bits(32) op32 = if with_zero then <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 32) else <a link="impl-aarch32.S.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) S[integer n]">S</a>[m];
nzcv = <a link="impl-shared.FPCompare.4" file="shared_pseudocode.xml" hover="function: bits(4) FPCompare(bits(N) op1, bits(N) op2, boolean signal_nans, FPCRType fpcr)">FPCompare</a>(<a link="impl-aarch32.S.read.1" file="shared_pseudocode.xml" hover="accessor: bits(32) S[integer n]">S</a>[d], op32, quiet_nan_exc, FPSCR[]);
when 64
bits(64) op64 = if with_zero then <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 64) else <a link="impl-aarch32.D.read.1" file="shared_pseudocode.xml" hover="accessor: bits(64) D[integer n]">D</a>[m];
nzcv = <a link="impl-shared.FPCompare.4" file="shared_pseudocode.xml" hover="function: bits(4) FPCompare(bits(N) op1, bits(N) op2, boolean signal_nans, FPCRType fpcr)">FPCompare</a>(<a link="impl-aarch32.D.read.1" file="shared_pseudocode.xml" hover="accessor: bits(64) D[integer n]">D</a>[d], op64, quiet_nan_exc, FPSCR[]);
FPSCR&lt;31:28&gt; = nzcv; // FPSCR.&lt;N,Z,C,V&gt; set to nzcv</pstext>
</ps>
</ps_section>
</instructionsection>