<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - UNREACHABLE at LegalizeDAG.cpp: "Unexpected request for libcall!" (x86_64, SKX)"
   href="https://bugs.llvm.org/show_bug.cgi?id=34934">34934</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>UNREACHABLE at LegalizeDAG.cpp: "Unexpected request for libcall!" (x86_64, SKX)
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>babokin@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>clang trunk, x86_64, rev315522

<span class="quote">> cat f.cpp</span >
typedef long a __attribute__((ext_vector_type(3)));
a b, c, d, e, f, g, h, i, j;
struct k {
  a l;
  a m;
} n;
void o() {
  i = d / n.m / c >> 50 >>
      ~(-8070450532247928833L -
        -128 * (-8070450532247928833L / f * (e / n.m) / b)) /
          (h + 9223372036854775807 << g + 5031444984503316195);
  (-8070450532247928833L - -128 * (-8070450532247928833L / f * (e / n.m) / b))
/
      -(n.l - -128 * (-8070450532247928833L / f * (e / n.m) / b));
  j = d / n.m / c >> 50 >>
      ~(-8070450532247928833L -
        -128 * (-8070450532247928833L / f * (e / n.m) / b)) /
          (h + 9223372036854775807 << g + 5031444984503316195);
}

<span class="quote">> clang++ -w -O2 -march=skx -c f.cpp</span >
Unexpected request for libcall!
UNREACHABLE executed at
/home/dybaboki/llvm/llvm-trunk-20171011/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:2134!
#0 0x00000000013596cf llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x13596cf)
#1 0x00000000013599d6 SignalHandler(int)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x13599d6)
#2 0x00007fda080af370 __restore_rt (/lib64/libpthread.so.0+0xf370)
#3 0x00007fda06c2b1d7 __GI_raise (/lib64/libc.so.6+0x351d7)
#4 0x00007fda06c2c8c8 __GI_abort (/lib64/libc.so.6+0x368c8)
#5 0x00000000013182b9
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x13182b9)
#6 0x0000000001a38974 (anonymous
namespace)::SelectionDAGLegalize::ConvertNodeToLibcall(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1a38974)
#7 0x0000000001a20348 (anonymous
namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1a20348)
#8 0x0000000001a1f4e1 llvm::SelectionDAG::Legalize()
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1a1f4e1)
#9 0x0000000001ad7437 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1ad7437)
#10 0x0000000001ad4e92
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1ad4e92)
#11 0x0000000001ad1606
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x1ad1606)
#12 0x00000000008276c1 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0x8276c1)
#13 0x0000000000bdaf48
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0xbdaf48)
#14 0x0000000000eef0ef llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/dybaboki/llvm/bin-trunk-20171011/bin/clang-6.0+0xeef0ef)
<...></pre>
        </div>
      </p>


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