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<instructionsection id="fmul_z_zzi" title="FMUL (indexed)" type="instruction">
  <docvars>
    <docvar key="instr-class" value="sve" />
    <docvar key="isa" value="A64" />
    <docvar key="mnemonic" value="FMUL" />
  </docvars>
  <heading>FMUL (indexed)</heading>
  <desc>
    <brief>Floating-point multiply by indexed elements</brief>
    <description>
      <para>Multiply all floating-point elements within each 128-bit segment of the first source vector by the specified element in the corresponding second source vector segment. The results are placed in the corresponding elements of the destination vector.</para>
      <para>The elements within the second source vector are specified using an immediate index which selects the same element position within each 128-bit vector segment. The index range is from 0 to one less than the number of elements per 128-bit segment, encoded in 1 to 3 bits depending on the size of the element. This instruction is unpredicated.</para>
    </description>
    <status>Green</status>
    <predicated>False</predicated>
  </desc>
  <alias_list howmany="0"></alias_list>
  <classes>
    <classesintro count="3">
      <txt>It has encodings from 3 classes:</txt>
      <a href="#iclass_half">Half-precision</a>
      <txt>, </txt>
      <a href="#iclass_single">Single-precision</a>
      <txt> and </txt>
      <a href="#iclass_double">Double-precision</a>
    </classesintro>
    <iclass name="Half-precision" oneof="3" id="iclass_half" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="datatype" value="half" />
        <docvar key="instr-class" value="sve" />
        <docvar key="isa" value="A64" />
        <docvar key="mnemonic" value="FMUL" />
      </docvars>
      <iclassintro count="1"></iclassintro>
      <regdiagram form="32" psname="FMUL-Z.ZZi-H">
        <box hibit="31" width="8" settings="8">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="23" settings="1">
          <c>0</c>
        </box>
        <box hibit="22" name="i3h" usename="1">
          <c></c>
        </box>
        <box hibit="21" settings="1">
          <c>1</c>
        </box>
        <box hibit="20" width="2" name="i3l" usename="1">
          <c colspan="2"></c>
        </box>
        <box hibit="18" width="3" name="Zm" usename="1">
          <c colspan="3"></c>
        </box>
        <box hibit="15" width="4" settings="4">
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="11" name="o2" settings="1">
          <c>0</c>
        </box>
        <box hibit="10" settings="1">
          <c>0</c>
        </box>
        <box hibit="9" width="5" name="Zn" usename="1">
          <c colspan="5"></c>
        </box>
        <box hibit="4" width="5" name="Zd" usename="1">
          <c colspan="5"></c>
        </box>
      </regdiagram>
      <encoding name="fmul_z_zzi_h" oneofinclass="1" oneof="3" label="">
        <docvars>
          <docvar key="datatype" value="half" />
          <docvar key="instr-class" value="sve" />
          <docvar key="isa" value="A64" />
          <docvar key="mnemonic" value="FMUL" />
        </docvars>
        <asmtemplate><text>FMUL    </text><a link="sa_zd" hover="Destination scalable vector register (field &quot;Zd&quot;)">&lt;Zd&gt;</a><text>.H, </text><a link="sa_zn" hover="First source scalable vector register (field &quot;Zn&quot;)">&lt;Zn&gt;</a><text>.H, </text><a link="sa_zm_1" hover="Second source scalable vector register Z0-Z7 (field &quot;Zm&quot;)">&lt;Zm&gt;</a><text>.H[</text><a link="sa_imm_1" hover="Immediate index [0-7] (field &quot;i3h:i3l&quot;)">&lt;imm&gt;</a><text>]</text></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="FMUL-Z.ZZi-H" mylink="FMUL-Z.ZZi-H" enclabels="" sections="1" secttype="noheading">
          <pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSVE.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE()">HaveSVE</a>() &amp;&amp; !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
constant integer esize = 16;
integer index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(i3h:i3l);
integer n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zn);
integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zm);
integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zd);</pstext>
        </ps>
      </ps_section>
    </iclass>
    <iclass name="Single-precision" oneof="3" id="iclass_single" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="datatype" value="single" />
        <docvar key="instr-class" value="sve" />
        <docvar key="isa" value="A64" />
        <docvar key="mnemonic" value="FMUL" />
      </docvars>
      <iclassintro count="1"></iclassintro>
      <regdiagram form="32" psname="FMUL-Z.ZZi-S" tworows="1">
        <box hibit="31" width="8" settings="8">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="23" name="size&lt;1&gt;" usename="1" settings="1">
          <c>1</c>
        </box>
        <box hibit="22" name="size&lt;0&gt;" usename="1" settings="1">
          <c>0</c>
        </box>
        <box hibit="21" settings="1">
          <c>1</c>
        </box>
        <box hibit="20" width="2" name="i2" usename="1">
          <c colspan="2"></c>
        </box>
        <box hibit="18" width="3" name="Zm" usename="1">
          <c colspan="3"></c>
        </box>
        <box hibit="15" width="4" settings="4">
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="11" name="o2" settings="1">
          <c>0</c>
        </box>
        <box hibit="10" settings="1">
          <c>0</c>
        </box>
        <box hibit="9" width="5" name="Zn" usename="1">
          <c colspan="5"></c>
        </box>
        <box hibit="4" width="5" name="Zd" usename="1">
          <c colspan="5"></c>
        </box>
      </regdiagram>
      <encoding name="fmul_z_zzi_s" oneofinclass="1" oneof="3" label="">
        <docvars>
          <docvar key="datatype" value="single" />
          <docvar key="instr-class" value="sve" />
          <docvar key="isa" value="A64" />
          <docvar key="mnemonic" value="FMUL" />
        </docvars>
        <asmtemplate><text>FMUL    </text><a link="sa_zd" hover="Destination scalable vector register (field &quot;Zd&quot;)">&lt;Zd&gt;</a><text>.S, </text><a link="sa_zn" hover="First source scalable vector register (field &quot;Zn&quot;)">&lt;Zn&gt;</a><text>.S, </text><a link="sa_zm_1" hover="Second source scalable vector register Z0-Z7 (field &quot;Zm&quot;)">&lt;Zm&gt;</a><text>.S[</text><a link="sa_imm_2" hover="Immediate index [0-3] (field &quot;i2&quot;)">&lt;imm&gt;</a><text>]</text></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="FMUL-Z.ZZi-S" mylink="FMUL-Z.ZZi-S" enclabels="" sections="1" secttype="noheading">
          <pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSVE.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE()">HaveSVE</a>() &amp;&amp; !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
constant integer esize = 32;
integer index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(i2);
integer n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zn);
integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zm);
integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zd);</pstext>
        </ps>
      </ps_section>
    </iclass>
    <iclass name="Double-precision" oneof="3" id="iclass_double" no_encodings="1" isa="A64">
      <docvars>
        <docvar key="datatype" value="double" />
        <docvar key="instr-class" value="sve" />
        <docvar key="isa" value="A64" />
        <docvar key="mnemonic" value="FMUL" />
      </docvars>
      <iclassintro count="1"></iclassintro>
      <regdiagram form="32" psname="FMUL-Z.ZZi-D" tworows="1">
        <box hibit="31" width="8" settings="8">
          <c>0</c>
          <c>1</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
          <c>0</c>
        </box>
        <box hibit="23" name="size&lt;1&gt;" usename="1" settings="1">
          <c>1</c>
        </box>
        <box hibit="22" name="size&lt;0&gt;" usename="1" settings="1">
          <c>1</c>
        </box>
        <box hibit="21" settings="1">
          <c>1</c>
        </box>
        <box hibit="20" name="i1" usename="1">
          <c></c>
        </box>
        <box hibit="19" width="4" name="Zm" usename="1">
          <c colspan="4"></c>
        </box>
        <box hibit="15" width="4" settings="4">
          <c>0</c>
          <c>0</c>
          <c>1</c>
          <c>0</c>
        </box>
        <box hibit="11" name="o2" settings="1">
          <c>0</c>
        </box>
        <box hibit="10" settings="1">
          <c>0</c>
        </box>
        <box hibit="9" width="5" name="Zn" usename="1">
          <c colspan="5"></c>
        </box>
        <box hibit="4" width="5" name="Zd" usename="1">
          <c colspan="5"></c>
        </box>
      </regdiagram>
      <encoding name="fmul_z_zzi_d" oneofinclass="1" oneof="3" label="">
        <docvars>
          <docvar key="datatype" value="double" />
          <docvar key="instr-class" value="sve" />
          <docvar key="isa" value="A64" />
          <docvar key="mnemonic" value="FMUL" />
        </docvars>
        <asmtemplate><text>FMUL    </text><a link="sa_zd" hover="Destination scalable vector register (field &quot;Zd&quot;)">&lt;Zd&gt;</a><text>.D, </text><a link="sa_zn" hover="First source scalable vector register (field &quot;Zn&quot;)">&lt;Zn&gt;</a><text>.D, </text><a link="sa_zm" hover="Second source scalable vector register Z0-Z15 (field &quot;Zm&quot;)">&lt;Zm&gt;</a><text>.D[</text><a link="sa_imm" hover="Immediate index [0-1] (field &quot;i1&quot;)">&lt;imm&gt;</a><text>]</text></asmtemplate>
      </encoding>
      <ps_section howmany="1">
        <ps name="FMUL-Z.ZZi-D" mylink="FMUL-Z.ZZi-D" enclabels="" sections="1" secttype="noheading">
          <pstext mayhavelinks="1" section="Decode" rep_section="decode">if !<a link="impl-aarch64.HaveSVE.0" file="shared_pseudocode.xml" hover="function: boolean HaveSVE()">HaveSVE</a>() &amp;&amp; !<a link="impl-aarch64.HaveSME.0" file="shared_pseudocode.xml" hover="function: boolean HaveSME()">HaveSME</a>() then UNDEFINED;
constant integer esize = 64;
integer index = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(i1);
integer n = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zn);
integer m = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zm);
integer d = <a link="impl-shared.UInt.1" file="shared_pseudocode.xml" hover="function: integer UInt(bits(N) x)">UInt</a>(Zd);</pstext>
        </ps>
      </ps_section>
    </iclass>
  </classes>
  <explanations scope="all">
    <explanation enclist="fmul_z_zzi_d, fmul_z_zzi_h, fmul_z_zzi_s" symboldefcount="1">
      <symbol link="sa_zd">&lt;Zd&gt;</symbol>
      <account encodedin="Zd">
        <intro>
          <para>Is the name of the destination scalable vector register, encoded in the "Zd" field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_d, fmul_z_zzi_h, fmul_z_zzi_s" symboldefcount="1">
      <symbol link="sa_zn">&lt;Zn&gt;</symbol>
      <account encodedin="Zn">
        <intro>
          <para>Is the name of the first source scalable vector register, encoded in the "Zn" field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_h, fmul_z_zzi_s" symboldefcount="1">
      <symbol link="sa_zm_1">&lt;Zm&gt;</symbol>
      <account encodedin="Zm">
        <intro>
          <para>For the half-precision and single-precision variant: is the name of the second source scalable vector register Z0-Z7, encoded in the "Zm" field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_d" symboldefcount="2">
      <symbol link="sa_zm">&lt;Zm&gt;</symbol>
      <account encodedin="Zm">
        <docvars>
          <docvar key="datatype" value="double" />
        </docvars>
        <intro>
          <para>For the double-precision variant: is the name of the second source scalable vector register Z0-Z15, encoded in the "Zm" field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_h" symboldefcount="1">
      <symbol link="sa_imm_1">&lt;imm&gt;</symbol>
      <account encodedin="i3h:i3l">
        <docvars>
          <docvar key="datatype" value="half" />
        </docvars>
        <intro>
          <para>For the half-precision variant: is the immediate index, in the range 0 to 7, encoded in the "i3h:i3l" fields.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_s" symboldefcount="2">
      <symbol link="sa_imm_2">&lt;imm&gt;</symbol>
      <account encodedin="i2">
        <docvars>
          <docvar key="datatype" value="single" />
        </docvars>
        <intro>
          <para>For the single-precision variant: is the immediate index, in the range 0 to 3, encoded in the "i2" field.</para>
        </intro>
      </account>
    </explanation>
    <explanation enclist="fmul_z_zzi_d" symboldefcount="3">
      <symbol link="sa_imm">&lt;imm&gt;</symbol>
      <account encodedin="i1">
        <docvars>
          <docvar key="datatype" value="double" />
        </docvars>
        <intro>
          <para>For the double-precision variant: is the immediate index, in the range 0 to 1, encoded in the "i1" field.</para>
        </intro>
      </account>
    </explanation>
  </explanations>
  <ps_section howmany="1">
    <ps name="FMUL-Z.ZZi-H" mylink="execute" enclabels="" sections="1" secttype="Operation">
      <pstext mayhavelinks="1" section="Execute" rep_section="execute"><a link="impl-aarch64.CheckSVEEnabled.0" file="shared_pseudocode.xml" hover="function: CheckSVEEnabled()">CheckSVEEnabled</a>();
constant integer VL = <a link="impl-aarch64.CurrentVL.read.none" file="shared_pseudocode.xml" hover="accessor: integer CurrentVL">CurrentVL</a>;
constant integer PL = VL DIV 8;
constant integer elements = VL DIV esize;
constant integer eltspersegment = 128 DIV esize;
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];
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];
bits(VL) result;

for e = 0 to elements-1
    integer segmentbase = e - (e MOD eltspersegment);
    integer s = segmentbase + index;
    bits(esize) element1 = <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, e, esize];
    bits(esize) element2 = <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, s, esize];
    <a link="impl-shared.Elem.write.3" file="shared_pseudocode.xml" hover="accessor: Elem[bits(N) &amp;vector, integer e, integer size] = bits(size) value">Elem</a>[result, e, esize] = <a link="impl-shared.FPMul.3" file="shared_pseudocode.xml" hover="function: bits(N) FPMul(bits(N) op1, bits(N) op2, FPCRType fpcr)">FPMul</a>(element1, element2, FPCR[]);

<a link="impl-aarch64.Z.write.2" file="shared_pseudocode.xml" hover="accessor: Z[integer n, integer width] = bits(width) value">Z</a>[d, VL] = result;</pstext>
    </ps>
  </ps_section>
</instructionsection>
