<div dir="ltr">This code has a number of issues (using copying all over the place) that is likely causing your issue.<div>For example:</div><div><div>// Idem for a list of Reg/Mask</div><div>  SmallVector<RegisterMaskPair, 8> getPairsForRegs(</div><div>    const SmallVector<RegisterMaskPair, 8> Regs);</div><div><br></div><div><br></div><div>You almost certainly meant this to be a const reference to Regs.</div><div>etc</div><div><br></div><div>Actually, staring at/ this harder, that function is just equivalent to std::copy, no?<br><br></div><div>I tried to patch it into a client, but it does not patch cleanly.<br></div><div>If you rebase it, i'll take a closer look.</div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 19, 2017 at 2:22 PM, Axel Davy <span dir="ltr"><<a href="mailto:axel.davy@ens.fr" target="_blank">axel.davy@ens.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF" text="#000000">
    <div class="m_-3118111395948692590moz-cite-prefix">Here is the code that makes use of
      this:<br>
      <br>
      <a class="m_-3118111395948692590moz-txt-link-freetext" href="https://reviews.llvm.org/D31124" target="_blank">https://reviews.llvm.org/<wbr>D31124</a><span class="HOEnZb"><font color="#888888"><br>
      <br>
      Axel</font></span><div><div class="h5"><br>
      <br>
      On 19/03/2017 22:16, Daniel Berlin wrote:<br>
    </div></div></div><div><div class="h5">
    <blockquote type="cite">
      <div dir="ltr">Can you give the actual code you are trying to use?<br>
        It should work fine in, say, densemap, if you define the
        densemapinfo for it.
        <div><br>
        </div>
        <div>Past that, without seeing exactly how you are trying to use
          it, it is hard to say what the problem is.</div>
        <div><br>
        </div>
        <div>I would venture a guess if you are doing it in a way that
          it is trying to default construct these, you are probably not
          doing it right :)</div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sun, Mar 19, 2017 at 12:44 PM, Axel
          Davy via llvm-commits <span dir="ltr"><<a href="mailto:llvm-commits@lists.llvm.org" target="_blank">llvm-commits@lists.llvm.org</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This is
            similar to just allocating the structure.<br>
            <br>
            Somehow to use maps, it complained without this constructor.<br>
            I don't think however any possible initialization value
            would make sense.<br>
            <br>
            Perhaps UINT_MAX for Reg and 0 for LaneMask ? To clearly
            indicate there is error<br>
            if you see these in logs ?<span class="m_-3118111395948692590HOEnZb"><font color="#888888"><br>
                <br>
                Axel</font></span>
            <div class="m_-3118111395948692590HOEnZb">
              <div class="m_-3118111395948692590h5"><br>
                <br>
                On 19/03/2017 20:23, Stanislav Mekhanoshin via
                Phabricator wrote:<br>
                <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                  rampitec added inline comments.<br>
                  <br>
                  <br>
                  ================<br>
                  Comment at: include/llvm/CodeGen/RegisterP<wbr>ressure.h:45<br>
                  +<br>
                  +  RegisterMaskPair() {}<br>
                  +<br>
                  ----------------<br>
                  That is undesirable to have a constructor which does
                  not initialize fields.<br>
                  <br>
                  <br>
                  Repository:<br>
                     rL LLVM<br>
                  <br>
                  <a href="https://reviews.llvm.org/D31123" rel="noreferrer" target="_blank">https://reviews.llvm.org/D3112<wbr>3</a><br>
                  <br>
                  <br>
                  <br>
                </blockquote>
                <br>
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              </div>
            </div>
          </blockquote>
        </div>
        <br>
      </div>
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    <p><br>
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