<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/131765>131765</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [MLIR] Function call cranshed when using `-remove-dead-values pass`:  Assertion `Idx < Size && "Out-of-bounds Bit access."' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            mlir
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          sweead
      </td>
    </tr>
</table>

<pre>
    test commit: [bd1be8a](https://github.com/llvm/llvm-project/commit/bd1be8a242384d98ef2087f4571b464e01501f5a)

step to reproduce:
`
mlir-opt test.mlir --remove-dead-values 
` 

test case:
```
module {
  func.func private @example(%arg0: tensor<4x4xf32>) -> tensor<4x4xi1> {
    llvm.unreachable
  }
  func.func private @main(%arg0: tensor<4x4xf32>) {
    %0 = call @example(%arg0) : (tensor<4x4xf32>) -> tensor<4x4xi1>
    llvm.return
  }
}

```

Crash backtrace:
```
mlir-opt: /home/workdir/llvm-project/llvm/include/llvm/ADT/BitVector.h:450: bool llvm::BitVector::operator[](unsigned int) const: Assertion `Idx < Size && "Out-of-bounds Bit access."' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: mlir-opt test.mlir --remove-dead-values
 #0 0x0000558617b9b1c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/workdir/llvm-project/build/bin/mlir-opt+0x12d51c8)
 #1 0x0000558617b98cee llvm::sys::RunSignalHandlers() (/home/workdir/llvm-project/build/bin/mlir-opt+0x12d2cee)
 #2 0x0000558617b9bbd1 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x00007f91304f0520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f91305449fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007f91304f0476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007f91304d67f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007f91304d671b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007f91304e7e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x000055861acdc1f4 (/home/workdir/llvm-project/build/bin/mlir-opt+0x44161f4)
#10 0x000055861acd83b6 void llvm::function_ref<void (mlir::Operation*)>::callback_fn<(anonymous namespace)::RemoveDeadValues::runOnOperation()::$_0>(long, mlir::Operation*) RemoveDeadValues.cpp:0:0
#11 0x0000558617cae24e void mlir::detail::walk<mlir::ForwardIterator>(mlir::Operation*, llvm::function_ref<void (mlir::Operation*)>, mlir::WalkOrder) (/home/workdir/llvm-project/build/bin/mlir-opt+0x13e824e)
#12 0x000055861acd59db (anonymous namespace)::RemoveDeadValues::runOnOperation() RemoveDeadValues.cpp:0:0
#13 0x000055861ac9fa43 mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43d9a43)
#14 0x000055861aca02e2 mlir::detail::OpToOpPassAdaptor::runPipeline(mlir::OpPassManager&, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43da2e2)
#15 0x000055861aca2abe mlir::PassManager::run(mlir::Operation*) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43dcabe)
#16 0x000055861ac9b03b performActions(llvm::raw_ostream&, std::shared_ptr<llvm::SourceMgr> const&, mlir::MLIRContext*, mlir::MlirOptMainConfig const&) MlirOptMain.cpp:0:0
#17 0x000055861ac9ac93 llvm::LogicalResult llvm::function_ref<llvm::LogicalResult (std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&)>::callback_fn<mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&)::$_0>(long, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&) MlirOptMain.cpp:0:0
#18 0x000055861ad46a65 mlir::splitAndProcessBuffer(std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::function_ref<llvm::LogicalResult (std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, llvm::raw_ostream&)>, llvm::raw_ostream&, llvm::StringRef, llvm::StringRef) (/home/workdir/llvm-project/build/bin/mlir-opt+0x4480a65)
#19 0x000055861ac948f2 mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43ce8f2)
#20 0x000055861ac94ba3 mlir::MlirOptMain(int, char**, llvm::StringRef, llvm::StringRef, mlir::DialectRegistry&) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43ceba3)
#21 0x000055861ac94db2 mlir::MlirOptMain(int, char**, llvm::StringRef, mlir::DialectRegistry&) (/home/workdir/llvm-project/build/bin/mlir-opt+0x43cedb2)
#22 0x0000558617b7a8df main (/home/workdir/llvm-project/build/bin/mlir-opt+0x12b48df)
#23 0x00007f91304d7d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#24 0x00007f91304d7e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#25 0x0000558617b7a435 _start (/home/workdir/llvm-project/build/bin/mlir-opt+0x12b4435)
Aborted (core dumped)
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzcWV1zozzS_TXKjcouIQSGC18QZ1zvVE0qqcnU8166BGqwNiCxksjH_votAQk2iZ8Z73g_q2Zig0T36dOnW0Lm1spKAaxRdI2imyveub02a_sMwMVVrsXr2oF1uNBNIx0KM4yi61wEOSQcRTeIJnvnWovCDNEtottKun2XLwvdILqt66e3j0Vr9F-gcIhuR1N0O5qhjIYJE2kCJSXJqmTRKshZzIAEEQnKiCOaIpIhklkHLXYaG2iNFl0B3i3JUEwQyZpamoVuHfZ4l_4KLxYGGv0ECwFcLJ543YHFwwN4sDjExu2BpeEfyRotuhowWl0jkmFcdqpY-j-4NfKJO8CIEXjhTVsDogmiETcV8QQ5UFYbFG7YC3spQ4rCL4imeIHCL8djMvC33hxg7HladsoAL_Y8r6G_jVY3p_03XKpfcj45QTQiGIU3uOB1_XkMfr5PNE3OC-UwDAOuM-oggvHvMceIZBvD7R7nvHh0hhef5WHM6wBpu9cNILp91uZRSPNRXaPmpCrqTsB0I7v5gej2Wro_oHDaLPcozFjUc5ZrXfeovfMwe58zXOoWDPdXfYEgmnSqLxmBpXKejUIr26PLrAXjpFYYxeSreMEo3OAH-TfAiMaIxhhRete5hS4Xue6UsPhaOsyLAqxdIkoRXeGSyxrEEpHs_tuX7OELtl3e-Fk47yovfG2cL4Gzq05a24FFdIu58tB7erDbAy6OM-B9PzhePGLRNe2QD7JEJL03ujK8wdxUXQPKeff4F6vOCwHRkGDyQgghUZTEwSpP86BIDpi3r3b4cm-kcj2IH70oaDJNMvx5p60zwJue1s1bHnoF_1QfeSdr4T995WzfxUWvyUtARRQUydBuPNxgBjcpAD6D-71TD7JSvP4_rkQNxvZQLoOIFgATIjonMBcBPvKNaNLzscFWVlKVeucQzfz1k5ai_5qOT9hl0foEk_7_4CAcHazKNAgJK0lEyRhHLXNEty9JvIvZopaqe1lUqhsGiqXVy7jHzGhEyYSYHRmMGEvLArdub4CL3aP0Pegc62mclsVkPZrDZasYV7YP71zYbBVPhuNjwyJelSHmua--s8zSZFWGk9nVB7NBfrbBIJ8MJscGYQVpfJ7BMIX0IPD0UGG8EEVQst8XMmNBHJRsXMlpGJCZmyTM416hB_XlVzvfTncGShRu-lFEE294mHDXt2ap1SBrvwT19_3S5vvZrlQo3CCacKXVa6M7ixVvwLZ9T0nH4u2b1Q1w8cfQqoYu06k7dWA_eZ-PKNuRfiFMaq0qX1knEeG58VnFeSaOm0zBgTIYmJjMCnBc1sP3Z14_onAzDW61eeZGfHXjOtVDOwVp85v8HkX7_7x-vDPCN51LNLsQEspg0gidaSRKRV8sl8nmr-QmPEaQlpyFJ9Jy1_7Qd-09tzYTvH3fPZhOHVHqJ4yJOJ2iaSRTvH610t5yxSvP86bfrfjP-Tbk92s0FCln4cQ_O46eEwr07OjvZQu1VDATlp_6HlR8cToOH_KuvirrTL9r0eaD1eMJg-dhYMR-zw0o91WVetzsDcV9CcY5BToxHs0YpzyHGdC30D9V17z9XAJhwfODmoxnFZGTMMctmFKbJuu7if3Jbs06MW6f9tyA2LXOv0RMTzzozhRwW_lG9kb3TCC3375-32jl4MV9SOZtLc1d6265VButSlkd2Ejxwegn5b6aBceLNDzol990JQtefwfb1e50Hz31AKLJe-ydkn_t4EPst9Bo83rdleUg7vf5Akre1W4noAYHp5_xK-CX4y4_z8CpZfJTCn81l__0eCZ0N5LXULjvUEnrzOtHcfyZAE4u4f8RmfmJPJMjeQoW8zg6CNy2tXSZEvdG-zfKN6z_FtH9F5bEn844HHtwRqrqO5Qnb1-i8bKE8DiaGu9sX56ypKSfq_5_rWYvsYoVkJTTOkvJnMychyfJHDcUxZ4PW4fsXDn8jIkLRZjzae9Gg3mEIj8tl3Mi_JeEIvKDZM3OPFY8ESVuuFSXOF_JWSLKydfs-EOsRHrm8QdNRUomg2xuEBjBu51_ZmcdN253EMkvuwB24CKa88PCCA_GL8MQC8c-lOXaOOhfEgttoD8gBDEieTuyvRLrUKRhyq9gHawYpUlK4uBqv16tUpYILhgN47wMaMiSgpdExGUhaFwGV3JNCY1IGCQkDQISLGnEKC0SGkZpUgJQxAg0XNbL_ohZm-qqP9VcB2GwiqOrmudQ2_6XDEp7nVKKopsrs-7jzbvKIkZqaZ2dLDjp6v7XD7-pRNEN3o5L13BAXhiu7B4Eft6Dwp2VqsIoJp_9sND6V7u4P1G-5FHwVWfq9T9-3Dty87Smfw8AAP__F-PpBQ">