<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/77118>77118</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "Requested to preserve LCSSA, but it's already broken."' failed.
        </td>
    </tr>

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

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

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

<pre>
    Run opt with -passes=loop-unroll

https://godbolt.org/z/GcEW4dhMh

Test.ll
```
; ModuleID = './reduced.ll'
source_filename = "./reduced.ll"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
target triple = "x86_64-unknown-linux-gnu"

define void @wombat() gc "statepoint-example" !prof !0 {
bb:
  br label %bb1

bb1: ; preds = %bb12, %bb
  %phi = phi i32 [ 1, %bb ], [ 0, %bb12 ]
  br label %bb2

bb2: ; preds = %bb11, %bb1
  %phi3 = phi i64 [ 0, %bb1 ], [ %sext, %bb11 ]
  br label %bb4

bb4: ; preds = %bb9, %bb2
  %phi5 = phi i64 [ %phi3, %bb2 ], [ %sext, %bb9 ]
  %phi6 = phi i32 [ 1, %bb2 ], [ %add10, %bb9 ]
  %trunc = trunc i64 %phi5 to i32
  br i1 true, label %bb9, label %bb7

bb7:                                              ; preds = %bb4
  %phi8 = phi i32 [ %trunc, %bb4 ]
  ret void

bb9: ; preds = %bb4
  %add = add i32 1, %phi
  %sext = sext i32 %add to i64
  %add10 = add i32 %phi6, 1
 %icmp = icmp ugt i32 %add10, 2
  br i1 %icmp, label %bb11, label %bb4

bb11:                                             ; preds = %bb9
  br i1 false, label %bb12, label %bb2

bb12: ; preds = %bb12, %bb11
  br i1 false, label %bb1, label %bb12, !prof !1
}

!0 = !{!"function_entry_count", i64 32768}
!1 = !{!"branch_weights", i32 11, i32 1}
```
Stack dump:
```
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/opt -o /app/output.s -S -S -passes=loop-unroll <source>
 #0 0x000000000359f928 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x359f928)
 #1 0x000000000359d07c SignalHandler(int) Signals.cpp:0:0
 #2 0x00007fe5f8e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x00007fe5f8e969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x00007fe5f8e42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x00007fe5f8e287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #6 0x00007fe5f8e2871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #7 0x00007fe5f8e39e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #8 0x00000000036a9544 llvm::simplifyLoop(llvm::Loop*, llvm::DominatorTree*, llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::AssumptionCache*, llvm::MemorySSAUpdater*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x36a9544)
 #9 0x000000000369b9d6 llvm::peelLoop(llvm::Loop*, unsigned int, llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::DominatorTree&, llvm::AssumptionCache*, bool, llvm::ValueMap<llvm::Value const*, llvm::WeakTrackingVH, llvm::ValueMapConfig<llvm::Value const*, llvm::sys::SmartMutex<false>>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x369b9d6)
#10 0x00000000033f771b tryToUnrollLoop(llvm::Loop*, llvm::DominatorTree&, llvm::LoopInfo*, llvm::ScalarEvolution&, llvm::TargetTransformInfo const&, llvm::AssumptionCache&, llvm::OptimizationRemarkEmitter&, llvm::BlockFrequencyInfo*, llvm::ProfileSummaryInfo*, bool, int, bool, bool, bool, std::optional<unsigned int>, std::optional<unsigned int>, std::optional<bool>, std::optional<bool>, std::optional<bool>, std::optional<bool>, std::optional<bool>, std::optional<unsigned int>) LoopUnrollPass.cpp:0:0
#11 0x00000000033fa420 llvm::LoopUnrollPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x33fa420)
#12 0x00000000037a6b8e llvm::detail::PassModel<llvm::Function, llvm::LoopUnrollPass, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x37a6b8e)
#13 0x0000000000d8693d llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xd8693d)
#14 0x0000000002f3dfee llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x2f3dfee)
#15 0x0000000000d6ac7e llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xd6ac7e)
#16 0x0000000002f3bf9c llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x2f3bf9c)
#17 0x0000000000895e8a llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x895e8a)
#18 0x000000000079c6d3 main (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x79c6d3)
#19 0x00007fe5f8e29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#20 0x00007fe5f8e29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#21 0x000000000088b0de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x88b0de)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWV9z4jgS_zTKiwrKlv8_8EAgzE7dpHZqyM4-UrIlgy6y5JPkSdhPfyXZgG0gl8zwsHeXIliWun_q_nW3LAusNdsKSmcgugfR8g43ZifV7AmbPRZ4KZvc6Ltckv3sWyOgrA18YWYHJzXWmmoQLLmU9aQRSnIOvCXw5u33zphag2AO0Aqg1VaSXHIzlWoL0OovgFafioc_Q7J73PWVnqg20yNO7HWf9ja4h4-SNJx-XkIQLCFAyRSglaKkKSixaihpRbVsVEE3JeNU4Ip20mgsjVppg9WWGkiwwRzvZWMO8nRSgWBOJzVKPBDMA-S-7K0_vLWtOHRfE3Zs-CgFwdxH6aRMva4lXFd8UI_Dydp1M9s9qdFhIO3-A9SOobG1RrGaHz17TeNNHE4a8Szki5hwJprXyVY0R632m9CSCQp_SEYgCL0XWeXYAJQClMFtYYG0wYbWkgkzoa-4qjkFCEGA_FrJ0l49CJL7Fi3PbXhdE8JcQY5zyiFAUZ77_VntbTCHNn61okR3RlsxBNCibR5wAIrqHXMi9soCBEF0D_2jIATR0t1E99A79vrI9V80Bg2NQdeMOc3hD60JTubE4Xjivj0ARZq-mtOgf92qcGhVeMWq7AiGhkZFZ0Z1xp4U3jIt61vWasZvsD7GwoT43lUwoxpROLS25SzsrDbSwvc4Yb6VohasR082uk-GdCWWrg_9XeA2HPqfnvl_cOXoaNh3VFHjSmloWXYlkP3JMCFuwF7tXAee6x3rSdl4OTHXcDa1qpbCeIRnC7OH2EXU4h6SGaCIFVXtxFyj2fZR23COAtPpjGLRVsr1XPb9j0bnYuIPLCkx1-McaZeP65XuXy111CvRd8xzcd7eonhY7pJl34B2tXRz-nbRRD5AqGxEYZgUGyqM2m8K2QhjV2m0cFUSoCROTzjIriAjhFxhUew2L5Rtd0YfdG0W-cfWCWH4DF0bXDxD0lT1cekeSXhT4GVfldwqXEGstk1FhdGOR7SStQFoVciqZpyqCX2tuVRU2T6OxXZitwTKeqcntm6eAVrlTLSKcCItBK5re9-YujFTDSdr97m0mYAgWLQPchA8HHM48KD36h3-gigrM5RCzn_YRzUI5nqv28ZXxYRx_j4pXFCA0pOQwi8bqY2iuALIFQmzUcigexb-kpsA3XuvnVkAZSe7_ZHdxEsKuGZbgflvWBBu8dPOjLZbT4vaxslz_0cg1AElJY3KlIYoQl5nOGc5QKtuM9DbBNiBYqrlNHbmOZWBccEQM4uzsoC12SmKyeaZ2WB8ZAKnP5ggHBsdJjHcaufnR40Pk3iAHQ2xUZqUAcS5VOZjyE5xgByfIfv5hzH9fICZDDGDjGbxxzCdygAzHeRWjLMoDPs1waqas3L_Rcp6UAdtx9wtb8fOpayYwEaqJ0Xp2ahV-SxKeTawLjDH6uGH5I0tjbPxudZNVduhBS5258CPtJJqv17P_6gJNrYanEAuJb9lZbbkDNjLhuxleUbinmE1pfwt5hrhXqBIu4bchKtRCOL3MNkS1Zf7jnlDH3ENgsWoExZSaHM27Z8Uu8XymYnt998ugy2kKNn23ZDH5XhdYWUeG0NfQbBoH7LBQ_exDt4wwi6AxwjbpXf4zAjKxNaxUfsn-Yd71PxUYcQ_G-yR4pN7oXtSWOhSqspiHMj8T4Efjf9eG1axv7CV-EYrrJ4fKmZcLY0k77ksnleK_quhothfNPurkvb9ed1UFVZ9kUOidel-uB1ftSEtkHQWYw6CxaBUbOB_SczN9PccPvMggzY_2mz7ivWFR7vNU3-UpzhE3ijFThDdVqYRg8xddfvL8-QRmO81049Y4C1Vgwo-Kt28GFsfBsWIBk4mOM5T2rOTUIMZ73IQa_0oCeWXrT2rvx45o1ymmqoflLQkUP1z1NjPfwHnLaUDzoM-5x5J4ywgN-Dcyb7l28_S_P8bvTY2g-CF_eChMiAl7RdMeyb6JA8m2aDMCa6NVJcdbhU-5G6ncmtnO2cG3kbDVI1xkXxseTi4t3gnR7fKtRNH1zLt70N8S-uA93iUZXmZFe8o9Uts_6-w1LEwoCkZpGeaRTTFPStV43LrK6spZ2J46rA2iontN1peys0r28JHXOwczvzS6BeWq25z9rmq-bmUlPx3d9SyYvwCyC8NX3FnrhTe295-gBwnvNkycba6y9psjNtNuS2sm-8fTJC3pL5TxUpG1UHu2h707evN8qTNgkGaDN7IvSQrYhLACjNxqzlbyMGc2ei0IiPZBw-GnEofE3ljTBp6cLOxahttsDKbnlPvnoWGw1n8YVGluUcobPFvFiMHepz1cMJpqHIvdZS0P2u2J1IgmMP150_rh0_fW_FFNzFU1DRKULvjh36QjY5Q78gsIFmQ4Ts68xMvDJMgRuHdbhYQUhZ-RoiXlbQgWZx6OCq9MArijJSI3rEZ8lDo-V7kx1EQhtM4RWmEkpQgz09jLwShRyvM-NTWxFSq7R3TuqGzJPH99M4dTmv3Ey5Cgr5ANwgQAtHyTs2sziRvthqEHmfa6BOKYYbT2fxAHwSx92UCggemv9GiUZr9oHz_ZbFez1dSVS4Y8-VTe_49__K5raIYoBgChL7ZF0ptyTQS1t2jFDptV3aNgcwAlGiIuaKY7GGu5DMVU3eKncASM07J9K5RfDb6_ZiZXZNPC1nZdLLLQnuZ1Er-kxY2OZzLGqCVo-TfAQAA___5Dg43">