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184 lines
13 KiB
XML
184 lines
13 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="bfmops_za32_pp_zz" title="BFMOPS (widening)" type="instruction">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="BFMOPS" />
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</docvars>
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<heading>BFMOPS (widening)</heading>
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<desc>
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<brief>BFloat16 sum of outer products and subtract</brief>
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<description>
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<para>The BFloat16 floating-point sum of outer products and subtract instruction works with a 32-bit element ZA tile.</para>
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<para>This instruction multiplies the SVL<sub>S</sub>×2 sub-matrix of BFloat16 values held in the first source vector by the 2×SVL<sub>S</sub> sub-matrix of BFloat16 values in the second source vector.</para>
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<para>Each source vector is independently predicated by a corresponding governing predicate. When a 16-bit source element is Inactive it is treated as having the value +0.0, but if both pairs of source vector elements that correspond to a 32-bit destination element contain Inactive elements, then the destination element remains unmodified.</para>
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<para>The resulting SVL<sub>S</sub>×SVL<sub>S</sub> single-precision floating-point sum of outer products is then destructively subtracted from the single-precision floating-point destination tile. This is equivalent to performing a 2-way dot product and subtract from each of the destination tile elements.</para>
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<para>Each 32-bit container of the first source vector holds 2 consecutive column elements of each row of a SVL<sub>S</sub>×2 sub-matrix. Similarly, each 32-bit container of the second source vector holds 2 consecutive row elements of each column of a 2×SVL<sub>S</sub> sub-matrix.</para>
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<para>This instruction follows SME BFloat16 numerical behaviors.</para>
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</description>
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<status>Green</status>
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<predicated>True</predicated>
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<sm_policy>SM_1_only</sm_policy>
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<is_gov_pred_pair>True</is_gov_pred_pair>
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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="SME" oneof="1" id="iclass_mortlach" no_encodings="1" isa="A64">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="BFMOPS" />
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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_SME" feature="FEAT_SME" />
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</arch_variants>
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<regdiagram form="32" psname="BFMOPS-ZA32.PP.ZZ-_" tworows="1">
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<box hibit="31" width="2" 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="29" width="9" settings="9">
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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>0</c>
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<c>0</c>
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</box>
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<box hibit="20" width="5" name="Zm" usename="1">
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<c colspan="5"></c>
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</box>
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<box hibit="15" width="3" name="Pm" usename="1">
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<c colspan="3"></c>
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</box>
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<box hibit="12" width="3" name="Pn" usename="1">
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<c colspan="3"></c>
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</box>
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<box hibit="9" width="5" name="Zn" usename="1">
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<c colspan="5"></c>
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</box>
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<box hibit="4" name="S" usename="1" settings="1">
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<c>1</c>
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</box>
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<box hibit="3" settings="1">
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<c>0</c>
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</box>
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<box hibit="2" settings="1">
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<c>0</c>
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</box>
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<box hibit="1" width="2" name="ZAda" usename="1">
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<c colspan="2"></c>
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</box>
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</regdiagram>
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<encoding name="bfmops_za32_pp_zz_" oneofinclass="1" oneof="1" label="">
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<docvars>
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<docvar key="instr-class" value="mortlach" />
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<docvar key="isa" value="A64" />
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<docvar key="mnemonic" value="BFMOPS" />
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</docvars>
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<asmtemplate><text>BFMOPS </text><a link="sa_zada" hover="ZA tile ZA0-ZA3 (field "ZAda")"><ZAda></a><text>.S, </text><a link="sa_pn" hover="First governing scalable predicate register P0-P7 (field "Pn")"><Pn></a><text>/M, </text><a link="sa_pm" hover="Second governing scalable predicate register P0-P7 (field "Pm")"><Pm></a><text>/M, </text><a link="sa_zn" hover="First source scalable vector register (field "Zn")"><Zn></a><text>.H, </text><a link="sa_zm" hover="Second source scalable vector register (field "Zm")"><Zm></a><text>.H</text></asmtemplate>
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</encoding>
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<ps_section howmany="1">
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<ps name="BFMOPS-ZA32.PP.ZZ-_" mylink="BFMOPS-ZA32.PP.ZZ-_" enclabels="" sections="1" secttype="noheading">
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<pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
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integer a = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pn);
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integer b = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Pm);
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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);
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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>(Zm);
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integer da = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(ZAda);
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boolean sub_op = 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="bfmops_za32_pp_zz_" symboldefcount="1">
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<symbol link="sa_zada"><ZAda></symbol>
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<account encodedin="ZAda">
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<intro>
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<para>Is the name of the ZA tile ZA0-ZA3, encoded in the "ZAda" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="bfmops_za32_pp_zz_" symboldefcount="1">
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<symbol link="sa_pn"><Pn></symbol>
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<account encodedin="Pn">
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<intro>
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<para>Is the name of the first governing scalable predicate register P0-P7, encoded in the "Pn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="bfmops_za32_pp_zz_" symboldefcount="1">
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<symbol link="sa_pm"><Pm></symbol>
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<account encodedin="Pm">
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<intro>
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<para>Is the name of the second governing scalable predicate register P0-P7, encoded in the "Pm" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="bfmops_za32_pp_zz_" symboldefcount="1">
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<symbol link="sa_zn"><Zn></symbol>
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<account encodedin="Zn">
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<intro>
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<para>Is the name of the first source scalable vector register, encoded in the "Zn" field.</para>
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</intro>
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</account>
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</explanation>
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<explanation enclist="bfmops_za32_pp_zz_" symboldefcount="1">
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<symbol link="sa_zm"><Zm></symbol>
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<account encodedin="Zm">
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<intro>
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<para>Is the name of the second source scalable vector register, encoded in the "Zm" 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="BFMOPS-ZA32.PP.ZZ-_" mylink="execute" enclabels="" sections="1" secttype="Operation">
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<pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckStreamingSVEAndZAEnabled.0" file="shared_pseudocode.xml" hover="function: CheckStreamingSVEAndZAEnabled()">CheckStreamingSVEAndZAEnabled</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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constant integer dim = VL DIV 32;
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bits(PL) mask1 = <a link="impl-aarch64.P.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) P[integer n, integer width]">P</a>[a, PL];
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bits(PL) mask2 = <a link="impl-aarch64.P.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) P[integer n, integer width]">P</a>[b, PL];
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bits(VL) operand1 = <a link="impl-aarch64.Z.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) Z[integer n, integer width]">Z</a>[n, VL];
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bits(VL) operand2 = <a link="impl-aarch64.Z.read.2" file="shared_pseudocode.xml" hover="accessor: bits(width) Z[integer n, integer width]">Z</a>[m, VL];
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bits(dim*dim*32) operand3 = <a link="impl-aarch64.ZAtile.read.3" file="shared_pseudocode.xml" hover="accessor: bits(width) ZAtile[integer tile, integer esize, integer width]">ZAtile</a>[da, 32, dim*dim*32];
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bits(dim*dim*32) result;
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for row = 0 to dim-1
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for col = 0 to dim-1
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// determine row/col predicates
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boolean prow_0 = (<a link="impl-aarch64.ActivePredicateElement.3" file="shared_pseudocode.xml" hover="function: boolean ActivePredicateElement(bits(N) pred, integer e, integer esize)">ActivePredicateElement</a>(mask1, 2*row + 0, 16));
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boolean prow_1 = (<a link="impl-aarch64.ActivePredicateElement.3" file="shared_pseudocode.xml" hover="function: boolean ActivePredicateElement(bits(N) pred, integer e, integer esize)">ActivePredicateElement</a>(mask1, 2*row + 1, 16));
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boolean pcol_0 = (<a link="impl-aarch64.ActivePredicateElement.3" file="shared_pseudocode.xml" hover="function: boolean ActivePredicateElement(bits(N) pred, integer e, integer esize)">ActivePredicateElement</a>(mask2, 2*col + 0, 16));
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boolean pcol_1 = (<a link="impl-aarch64.ActivePredicateElement.3" file="shared_pseudocode.xml" hover="function: boolean ActivePredicateElement(bits(N) pred, integer e, integer esize)">ActivePredicateElement</a>(mask2, 2*col + 1, 16));
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bits(32) sum = <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>[operand3, row*dim+col, 32];
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if (prow_0 && pcol_0) || (prow_1 && pcol_1) then
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bits(16) erow_0 = (if prow_0 then <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>[operand1, 2*row + 0, 16] else <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 16));
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bits(16) erow_1 = (if prow_1 then <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>[operand1, 2*row + 1, 16] else <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 16));
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bits(16) ecol_0 = (if pcol_0 then <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>[operand2, 2*col + 0, 16] else <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 16));
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bits(16) ecol_1 = (if pcol_1 then <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>[operand2, 2*col + 1, 16] else <a link="impl-shared.FPZero.2" file="shared_pseudocode.xml" hover="function: bits(N) FPZero(bit sign, integer N)">FPZero</a>('0', 16));
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if sub_op then
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boolean honor_altfp = FALSE; // Alternate handling ignored
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if prow_0 then erow_0 = <a link="impl-shared.BFNeg.2" file="shared_pseudocode.xml" hover="function: bits(16) BFNeg(bits(16) op, boolean honor_altfp)">BFNeg</a>(erow_0, honor_altfp);
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if prow_1 then erow_1 = <a link="impl-shared.BFNeg.2" file="shared_pseudocode.xml" hover="function: bits(16) BFNeg(bits(16) op, boolean honor_altfp)">BFNeg</a>(erow_1, honor_altfp);
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sum = <a link="impl-shared.BFDotAdd.6" file="shared_pseudocode.xml" hover="function: bits(32) BFDotAdd(bits(32) addend, bits(16) op1_a, bits(16) op1_b, bits(16) op2_a, bits(16) op2_b, FPCRType fpcr_in)">BFDotAdd</a>(sum, erow_0, erow_1, ecol_0, ecol_1, FPCR[]);
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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, row*dim+col, 32] = sum;
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<a link="impl-aarch64.ZAtile.write.3" file="shared_pseudocode.xml" hover="accessor: ZAtile[integer tile, integer esize, integer width] = bits(width) value">ZAtile</a>[da, 32, dim*dim*32] = result;</pstext>
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</ps>
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</ps_section>
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</instructionsection>
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