<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/154407>154407</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL] Assert & crash in OpLowerer when resolving `llvm.dx.resource.casthandle` on a phi node
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    ```
RWStructuredBuffer<int> Out[4] : register(u0);

[numthreads(4,1,1)]
void main(uint GI : SV_GroupIndex) {
 for (int i = 0; i < GI; i++)
    Out[GI].IncrementCounter();
  
 Out[GI][0] = Out[GI].IncrementCounter();
}
```

https://godbolt.org/z/Ezjdfadj1

`OpLowerer::cleanupHandleCasts` is expecting the operand of `@llvm.dx.resource.casthandle` to be a `CallInst` and it is a phi node:
```
  %.pre-phi = phi target("dx.RawBuffer", i32, 1, 0) [ %1, %entry._Z4mainj.exit_crit_edge ], [ %3, %for.body.i ]

  %6 = call %dx.types.Handle @llvm.dx.resource.casthandle.s_dx.types.Handles.tdx.RawBuffer_i32_1_0t(target("dx.RawBuffer", i32, 1, 0) %.pre-phi)
```

```
 #0 0x0000000003cff348 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3cff348)
 #1 0x0000000003cfcd1c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3cfcd1c)
 #2 0x0000000003c4cfd8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007a5b5fe42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00000000036cca1c llvm::Value::doRAUW(llvm::Value*, llvm::Value::ReplaceMetadataUses) (/opt/compiler-explorer/clang-trunk/bin/clang+0x36cca1c)
 #5 0x0000000002b3e445 (anonymous namespace)::OpLowerer::lowerIntrinsics() (.constprop.0) DXILOpLowering.cpp:0:0
 #6 0x0000000002b40de5 (anonymous namespace)::DXILOpLoweringLegacy::runOnModule(llvm::Module&) DXILOpLowering.cpp:0:0
 #7 0x0000000003644709 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3644709)
 #8 0x0000000003fa339d clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3fa339d)
 #9 0x000000000464753c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x464753c)
#10 0x00000000062ce46c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+0x62ce46c)
#11 0x0000000004647d2d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+0x4647d2d)
#12 0x0000000004953a3a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+0x4953a3a)
#13 0x00000000048ccd7b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x48ccd7b)
#14 0x0000000004a44df3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+0x4a44df3)
#15 0x0000000000dc0775 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+0xdc0775)
#16 0x0000000000db871d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#17 0x00000000046ba419 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#18 0x0000000003c4d3f3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+0x3c4d3f3)
#19 0x00000000046ba639 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#20 0x000000000467d5bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+0x467d5bd)
#21 0x000000000467e571 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+0x467e571)
#22 0x000000000468860c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+0x468860c)
#23 0x0000000000dbcf81 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+0xdbcf81)
#24 0x0000000000c6bb44 main (/opt/compiler-explorer/clang-trunk/bin/clang+0xc6bb44)
#25 0x00007a5b5fe29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#26 0x00007a5b5fe29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#27 0x0000000000db81b5 _start (/opt/compiler-explorer/clang-trunk/bin/clang+0xdb81b5)
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWV9z26zS_zTkholGQn9sX-TCceI-6aSTTtz2eee90SBY27QYdAAlzvPpz4DkSHKdtJ3knJvTcSoZ2OW3v112AVNrxUYBXKD8EuVXZ7RxW20utvBDO3pWaf50gYq4-8Tz-79XzjTMNQb4ZbNeg0HpQiiH0mt81ziUX2Yov8IonWMDG2EdGESmTYzIDKWXKJ77T36pmp3bGqDcIjLNEFkk7d8M5Vconj9owfGOCuVlhXL4w01QufpWfjC6qW8Uhz0iM4wmXidea4MRmfqRAqP0CscovQyvC_zhJrwjchk-Mz8e4w7shxuUX0U3ihnYgXIL3agW8TNejP1_g9Eov4xbE69-WwmaeKuGPKJ4vnWutiidI7JEZLnRvNLSRdpsEFn-g8jy-p_vfE3596RjrYjv6lv9CMZzPkfpnEmgqqn_oopLWFDrLCpiLCyGfQ3MCbXBbgtY12Co4livsZ87i6V82EV8HxmwujEMIkat2wYtXoHTuAJM_eAFlfJGWeebvQrhvHqK663ASnPwOMZ2YYxIHtUGzv0Yz5F_Omo24AIjhO-je_rYxQ4hiCywSMPDxwCOg1vzS68nNCCSg3LmKSr_P_Mh8T2CvXAlM8KVwDeAvU_8uFYm7WTW2kQ-eiOB25g6gCsCKkal9N_4PnJPNdioZRG_Tk9kyyMBG7mhQaVISZmUsbf1j43uiWvD9CheRjQjksY43seHfylbr9Nsij34Njrsk21fPhuh3MpR9uOLoQwQmfaDDH0stXUG6A6RIsBSrgUzRWSpa4fIkuldLSSYc9jXUvvwI0smqdqcO9OoH4gsK79S2zZELuN9h6ZbbYikyRFWxhN2CuuiDek7tRIbRaVf_irkJ46l9srfAZmfu0dGxsgytuZTvDDUbu-B6QcwTy2U1t2mzTIex2jMQisHexexukbpPA5_rf600z-heZWvISM5iTsbpKgQWe6nRVlk51KoZn--UU3bwSKroyJADiI94GwEuGCMjqj8RmUD7SvX9_Ovf4_83faSuff0SZl7qCVl8Akc5dTRrxbsO5DeouxtyIc2kCqFLMv9HFRp9bTTjcWK7sDWIVxnLbKj5Cf9lxvljFBWMNtmW68jYlpZVxtdR2FZXf3fzW0nK9TmhIeKMZgs5vBLMGOlt7Ch7KlbUY26U580b-R4pR2ait_CNBk7Ocsm8WzgMDmY8DO19hNVdAPmZlfLZxQvz_5WZwY0vTOnI6xrmqYzjtvxYW7YCXdJ2Q9Q_K5xdeNT4qB70SHwdYYqBl0eGo3g8AHUXe2EVrbr721b-RjY3MN63HwweX6krYMyZ17bWMSHU2PFA9zDeqHcZ-c3N333w7rLUkshYfVkHexQeu1VWMfbnkaJfzVQ1keSPs3Wj0Y4KA_JdiDEYU0b6UoOEhz8QjC97ub82aSFVrbZeRfO38HNrSN7N8-Gbs6KbJKn7DUQobHNml8MVVZST_hXJY78P1996bLnu4Rnh6yroCRNRmWyIAyyYoT7MzUW5qsvY1Qr2NEu0iqtZf98K74OQY8vOeaVE34i-rt4DU3Xe2CNg0MIT9-HNU54j2pUFrNZntKUDlEtjffZ8zIawnofQO2UPaB0BGjKGJ9U-LU0cpKply14l9hrYfWgR7U6o1nG1-kQdAevx_6gGf0Z6s8p8h0WeAenBzsqyjFn8WSSY8aSsjuI9Vlpbgx98gk3XbAtNThUXA-qy0yjNrLA_jj3LphbUD3kYgy5mk4Sjg-kLpIvYcUOgK92VMpvwJzuauUJ_EfVxevo8tNhXIgUbsQDmKPS7TFNxuu5olkyCwwMlK4bFaKuNIHE0Hs4L153hzsqZUXZj3KtPMw-GNqJu8BYJAu921HFj1fgSWc9VxwdSimVo1rT19HnGvMsUJZsv0-S9ktFrWC-HgmPKVA4GuwbSmeocPbQfaSOSukDXZtBvx8y7_NsiJaW8CCCyETSXcUpIpOeKjI9HAs-6uqEM6ZHu3uertOBH07t4bt9cKNWdA3yacTl6357h8NJANjH9-w4lop0hv-XYyFs8GtqXLu3P-l0Eo9Zm_C84i-yFpxEfypiBypHefhI0A8Y5ITFK3MMh85H-4qBYW-q38HK58ghR7uKCeST5E85-Kgr-zIBH3V1K6wbEfBapn12eE3F4dLwDzjrouI_wZznpmduvPMpptMiZi-hvBq8j2r5iSL-EuP_RebevksMbPRcpUf1l62nXZQdNg0HrCEvzH-6eXipur5xmxCA9DBH27CYFVWVZeF6-Y3ztJr6efLxXQ-Z8dkf3vUEkV5hcawQshiXpZcpraPGlQMrfnsKyAZTTI63UEmV41b5m73gdR1dZZ7xi5TP0hk9g4tkkucFmRVJfLa9gJzFOal4zjMoEn-IK-JJzGPGgBAGcCYuSEzyeJrMkmmepnGUsSmnMClmjCW8mqYoi2FHhYzCBa42mzNhbQMXSZ5l8eRM0gqkDT9zEKLgEYdeRAjKr87MhRc6r5qNRVkshXW2V-OEk-H3kb9uV7cov8JzayHQU2DmdxBYKPx8PYUft6CwAavlg1AbjIpfXbhrNbhSP2uMvDj6aUC4bVNFTO-8M_3aaR_ntdHfgXnvBFssIsvO2IcL8u8AAAD__8m4zg4">