264 lines
12 KiB
XML
264 lines
12 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="VCVT_bfs" title="VCVT (from single-precision to BFloat16, Advanced SIMD) -- AArch32" type="instruction">
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<docvars>
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="mnemonic" value="VCVT" />
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</docvars>
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<heading>VCVT (from single-precision to BFloat16, Advanced SIMD)</heading>
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<desc>
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<brief>
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<para>Vector Convert from single-precision to BFloat16</para>
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</brief>
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<authored>
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<para>Vector Convert from single-precision to BFloat16 converts each 32-bit element in a vector from single-precision floating-point to BFloat16 format, and writes the result into a second vector. The result vector elements are half the width of the source vector elements.</para>
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<para>Unlike the BFloat16 multiplication instructions, this instruction uses the Round to Nearest rounding mode, and can generate a floating-point exception that causes cumulative exception bits in the <xref linkend="AArch32.fpscr">FPSCR</xref> to be set.</para>
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</authored>
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</desc>
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<alias_list howmany="0"></alias_list>
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<classes>
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<classesintro count="2">
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<txt>It has encodings from the following instruction sets:</txt>
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<txt> A32 (</txt>
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<a href="#iclass_a1">A1</a>
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<txt>)</txt>
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<txt> and </txt>
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<txt> T32 (</txt>
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<a href="#iclass_t1">T1</a>
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<txt>)</txt>
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<txt>.</txt>
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</classesintro>
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<iclass name="A1" oneof="2" id="iclass_a1" no_encodings="1" isa="A32">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="VCVT" />
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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="ARMv8.6" feature="FEAT_AA32BF16" />
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</arch_variants>
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<regdiagram form="32" psname="aarch32/instrs/VCVT/T1A1_A.txt">
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<box hibit="31" width="9" settings="9">
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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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<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="22" name="D" usename="1">
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<c></c>
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</box>
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<box hibit="21" width="2" settings="2">
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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="19" width="2" name="size" settings="2">
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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="17" width="2" name="opc1" settings="2">
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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="15" width="4" name="Vd" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="11" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" width="4" name="opc2" settings="4">
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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="6" name="Q" settings="1">
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<c>1</c>
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</box>
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<box hibit="5" name="M" usename="1">
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<c></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="Vm" 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="VCVT_bfs_A1" oneofinclass="1" oneof="2" label="A1">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="A32" />
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<docvar key="mnemonic" value="VCVT" />
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</docvars>
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<asmtemplate><text>VCVT</text><text>{</text><a link="sa_c_1" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><c></a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text>.BF16.F32 </text><a link="sa_dd" hover="64-bit SIMD&FP destination register (field "D:Vd")"><Dd></a><text>, </text><a link="sa_qm" hover="128-bit SIMD&FP source register (field "M:Vm")"><Qm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/VCVT/T1A1_A.txt" mylink="aarch32.instrs.VCVT.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-shared.HaveAArch32BF16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveAArch32BF16Ext()">HaveAArch32BF16Ext</a>() then UNDEFINED;
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if Vm<0> == '1' then UNDEFINED;
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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>(D:Vd);
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integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</pstext>
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</ps>
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</ps_section>
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</iclass>
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<iclass name="T1" oneof="2" id="iclass_t1" no_encodings="1" isa="T32">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="VCVT" />
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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="ARMv8.6" feature="FEAT_AA32BF16" />
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</arch_variants>
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<regdiagram form="16x2" psname="aarch32/instrs/VCVT/T1A1_A.txt">
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<box hibit="31" width="9" settings="9">
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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>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>1</c>
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</box>
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<box hibit="22" name="D" usename="1">
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<c></c>
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</box>
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<box hibit="21" width="2" settings="2">
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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="19" width="2" name="size" settings="2">
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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="17" width="2" name="opc1" settings="2">
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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="15" width="4" name="Vd" usename="1">
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<c colspan="4"></c>
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</box>
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<box hibit="11" settings="1">
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<c>0</c>
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</box>
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<box hibit="10" width="4" name="opc2" settings="4">
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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="6" name="Q" settings="1">
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<c>1</c>
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</box>
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<box hibit="5" name="M" usename="1">
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<c></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="Vm" 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="VCVT_bfs_T1" oneofinclass="1" oneof="2" label="T1">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="instr-class" value="fpsimd" />
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<docvar key="isa" value="T32" />
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<docvar key="mnemonic" value="VCVT" />
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</docvars>
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<asmtemplate><text>VCVT</text><text>{</text><a link="sa_c" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><c></a><text>}</text><text>{</text><a link="sa_q" hover="See {xref{ARMARM_Babbefhf}{Standard assembler syntax fields}}"><q></a><text>}</text><text>.BF16.F32 </text><a link="sa_dd" hover="64-bit SIMD&FP destination register (field "D:Vd")"><Dd></a><text>, </text><a link="sa_qm" hover="128-bit SIMD&FP source register (field "M:Vm")"><Qm></a></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="aarch32/instrs/VCVT/T1A1_A.txt" mylink="aarch32.instrs.VCVT.T1A1_A.txt" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-shared.HaveAArch32BF16Ext.0" file="shared_pseudocode.xml" hover="function: boolean HaveAArch32BF16Ext()">HaveAArch32BF16Ext</a>() then UNDEFINED;
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if Vm<0> == '1' then UNDEFINED;
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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>(D:Vd);
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integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(M:Vm);</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="VCVT_bfs_A1" symboldefcount="1">
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<symbol link="sa_c_1"><c></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="armarmheading" value="A1" />
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<docvar key="isa" value="A32" />
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</docvars>
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<intro>
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<para>For encoding A1: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>. This encoding must be unconditional.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VCVT_bfs_T1" symboldefcount="2">
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<symbol link="sa_c"><c></symbol>
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<account encodedin="">
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<docvars>
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<docvar key="armarmheading" value="T1" />
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<docvar key="isa" value="T32" />
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</docvars>
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<intro>
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<para>For encoding T1: see <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VCVT_bfs_A1, VCVT_bfs_T1" symboldefcount="1">
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<symbol link="sa_q"><q></symbol>
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<account encodedin="">
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<intro>
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<para>See <xref linkend="Babbefhf">Standard assembler syntax fields</xref>.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VCVT_bfs_A1, VCVT_bfs_T1" symboldefcount="1">
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<symbol link="sa_dd"><Dd></symbol>
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<account encodedin="D:Vd">
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<intro>
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<para>Is the 64-bit name of the SIMD&FP destination register, encoded in the "D:Vd" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="VCVT_bfs_A1, VCVT_bfs_T1" symboldefcount="1">
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<symbol link="sa_qm"><Qm></symbol>
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<account encodedin="M:Vm">
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<intro>
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<para>Is the 128-bit name of the SIMD&FP source register, encoded in the "M:Vm" field as <Qm>*2.</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="aarch32/instrs/VCVT/Op_A.txt" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute">bits(128) operand;
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bits(64) result;
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if <a link="impl-aarch32.ConditionPassed.0" file="shared_pseudocode.xml" hover="function: boolean ConditionPassed()">ConditionPassed</a>() then
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EncodingSpecificOperations();
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<a link="impl-aarch32.CheckAdvSIMDEnabled.0" file="shared_pseudocode.xml" hover="function: CheckAdvSIMDEnabled()">CheckAdvSIMDEnabled</a>();
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operand = <a link="impl-aarch32.Q.read.1" file="shared_pseudocode.xml" hover="accessor: bits(128) Q[integer n]">Q</a>[m>>1];
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for e = 0 to 3
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bits(32) op = <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, 32];
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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, e, 16] = <a link="impl-shared.FPConvertBF.2" file="shared_pseudocode.xml" hover="function: bits(16) FPConvertBF(bits(32) op, FPCRType fpcr)">FPConvertBF</a>(op, <a link="impl-aarch32.StandardFPSCRValue.0" file="shared_pseudocode.xml" hover="function: FPCRType StandardFPSCRValue()">StandardFPSCRValue</a>());
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<a link="impl-aarch32.D.write.1" file="shared_pseudocode.xml" hover="accessor: D[integer n] = bits(64) value">D</a>[d] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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