[llvm-bugs] [Bug 34934] New: UNREACHABLE at LegalizeDAG.cpp: "Unexpected request for libcall!" (x86_64, SKX)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34934

            Bug ID: 34934
           Summary: UNREACHABLE at LegalizeDAG.cpp: "Unexpected request
                    for libcall!" (x86_64, SKX)
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: llvm-bugs at lists.llvm.org

clang trunk, x86_64, rev315522

> cat f.cpp
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);
}

> clang++ -w -O2 -march=skx -c f.cpp
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)
<...>

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