[llvm-bugs] [Bug 32894] New: ICE: "Cannot replace uses of with self" in llvm::SelectionDAG::ReplaceAllUsesWith

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32894

            Bug ID: 32894
           Summary: ICE: "Cannot replace uses of with self" in
                    llvm::SelectionDAG::ReplaceAllUsesWith
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: GlobalISel
          Assignee: unassignedbugs at nondot.org
          Reporter: babokin at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18392
  --> https://bugs.llvm.org/attachment.cgi?id=18392&action=edit
reproducers

LLVM trunk (301887), x86_64 build.

I've attached reduced (small.cpp) and original (big.cpp) test cases.

> clang++ -std=c++11 -w -O2 -c small.cpp
clang-5.0:
/home/dybaboki/llvm/llvm-trunk-20170501/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:6719:
void llvm::SelectionDAG::ReplaceAllUsesWith(llvm::SDValue, llvm::SDValue):
Assertion `From != To.getNode() && "Cannot replace uses of with self"' failed.
#0 0x00000000012a446f llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x12a446f)
#1 0x00000000012a4776 SignalHandler(int)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x12a4776)
#2 0x00007f0e91e31370 __restore_rt (/lib64/libpthread.so.0+0xf370)
#3 0x00007f0e909ae1d7 __GI_raise (/lib64/libc.so.6+0x351d7)
#4 0x00007f0e909af8c8 __GI_abort (/lib64/libc.so.6+0x368c8)
#5 0x00007f0e909a7146 __assert_fail_base (/lib64/libc.so.6+0x2e146)
#6 0x00007f0e909a71f2 (/lib64/libc.so.6+0x2e1f2)
#7 0x00000000019a9e91 llvm::SelectionDAG::ReplaceAllUsesWith(llvm::SDValue,
llvm::SDValue) (/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x19a9e91)
#8 0x00000000018963e2 (anonymous
namespace)::DAGCombiner::CombineTo(llvm::SDNode*, llvm::SDValue const*,
unsigned int, bool)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x18963e2)
#9 0x00000000018eed72 (anonymous
namespace)::DAGCombiner::ExtendSetCCUses(llvm::SmallVectorImpl<llvm::SDNode*>
const&, llvm::SDValue, llvm::SDValue, llvm::SDLoc const&, llvm::ISD::NodeType)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x18eed72)
#10 0x00000000018ce9e6 (anonymous
namespace)::DAGCombiner::visitZERO_EXTEND(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x18ce9e6)
#11 0x000000000189ec9a (anonymous namespace)::DAGCombiner::visit(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x189ec9a)
#12 0x00000000018986ac (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x18986ac)
#13 0x00000000018973f8 llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults&, llvm::CodeGenOpt::Level)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x18973f8)
#14 0x00000000019bb1c5 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x19bb1c5)
#15 0x00000000019b9a78
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x19b9a78)
#16 0x00000000019b6a46
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/dybaboki/llvm/bin-trunk-20170501/bin/clang-5.0+0x19b6a46)

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