<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/120883>120883</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
[mlir] -lift-cf-to-scf crashes
</td>
</tr>
<tr>
<th>Labels</th>
<td>
mlir
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
wwy6191
</td>
</tr>
</table>
<pre>
git version: bc29fc937c6cb4a210f80c93c79fc6ed97c801f8
system: `Ubuntu 18.04.6 LTS`
reproduce with: `mlir-opt -lift-cf-to-scf a.mlir`
a.mlir:
```
module {
func.func private @ext_func_result_attrs(%arg0: f32) -> (i32, i32) {
%cst0_i32 = spirv.Constant 0 : i32
%cst-1_i32 = spirv.Constant -1 : i32
%0 = spirv.Variable :!spirv.ptr<i32, Function>
%1 = spirv.Variable :!spirv.ptr<i32, Function>
spirv.mlir.loop {
spirv.Branch ^bb1(%cst0_i32, %cst-1_i32 : i32, i32)
^bb1(%3: i32, %4: i32): // 2 preds: ^bb0, ^bb2
%5 = spirv.SLessThan %3, %cst-1_i32 : i32
spirv.BranchConditional %5, ^bb2, ^bb3
^bb2: // pred: ^bb1
%6 = spirv.IAdd %3, %4 : i32
spirv.Store "Function" %0, %6 : i32
%7 = spirv.IAdd %3, %cst0_i32 : i32
spirv.Branch ^bb1(%7, %6 : i32, i32)
^bb3: // pred: ^bb1
spirv.mlir.merge
}
%2 = spirv.Load "Function" %1 : i32
%3 = spirv.Load "Function" %0 : i32
return %3, %2 : i32, i32
}
}
```
stack trace:
```
/data/szy/MLIR/seed/seed29/tmp.1nu1IKGsQn.mlir:11:7: error: 'spirv.BranchConditional' op Cannot convert unknown control flow op to structured control flow
spirv.BranchConditional %5, ^bb2, ^bb3
^
/data/szy/MLIR/seed/seed29/tmp.1nu1IKGsQn.mlir:11:7: note: see current operation: "spirv.BranchConditional"(%10, %6, %6, %7, %8)[INVALIDBLOCK, ^bb1] <{operandSegmentSizes = array<i32: 1, 0, 4>}> : (i1, i32, i32, i32, i32) -> ()
mlir-opt: /data/szy/MLIR/llvm-release/llvm-project/mlir/include/mlir/IR/UseDefLists.h:198: mlir::IRObjectWithUseList<mlir::BlockOperand>::~IRObjectWithUseList() [OperandType = mlir::BlockOperand]: Assertion `use_empty() && "Cannot destroy a value that still has uses!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: /data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt -lift-cf-to-scf /data/szy/MLIR/seed/seed29/tmp.1nu1IKGsQn.mlir
#0 0x000056551cfda418 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x11ee418)
#1 0x000056551cfd7f2e llvm::sys::RunSignalHandlers() (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x11ebf2e)
#2 0x000056551cfdadad SignalHandler(int) Signals.cpp:0:0
#3 0x00007f25fa8ce420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#4 0x00007f25f9f0b00b raise /build/glibc-LcI20x/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#5 0x00007f25f9eea859 abort /build/glibc-LcI20x/glibc-2.31/stdlib/abort.c:81:7
#6 0x00007f25f9eea729 get_sysdep_segment_value /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:509:8
#7 0x00007f25f9eea729 _nl_load_domain /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:970:34
#8 0x00007f25f9efbfd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
#9 0x000056552001baf9 (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x422faf9)
#10 0x00005655200f65e6 llvm::iplist_impl<llvm::simple_ilist<mlir::Block>, llvm::ilist_traits<mlir::Block>>::erase(llvm::ilist_iterator<llvm::ilist_detail::node_options<mlir::Block, true, false, void, false, void>, false, false>) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x430a5e6)
#11 0x00005655200f4fab mlir::Region::~Region() (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x4308fab)
#12 0x000056551ff89278 mlir::transformCFGToSCF(mlir::Region&, mlir::CFGToSCFInterface&, mlir::DominanceInfo&) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x419d278)
#13 0x000056551fa8b20f mlir::WalkResult llvm::function_ref<mlir::WalkResult (mlir::Operation*)>::callback_fn<(anonymous namespace)::LiftControlFlowToSCF::runOnOperation()::'lambda'(mlir::func::FuncOp)::operator()(mlir::func::FuncOp) const::'lambda'(mlir::Operation*)>(long, mlir::Operation*) ControlFlowToSCF.cpp:0:0
#14 0x000056551d107e27 mlir::WalkResult mlir::detail::walk<mlir::ForwardIterator>(mlir::Operation*, llvm::function_ref<mlir::WalkResult (mlir::Operation*)>, mlir::WalkOrder) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x131be27)
#15 0x000056551fa8adfe mlir::WalkResult llvm::function_ref<mlir::WalkResult (mlir::Operation*)>::callback_fn<std::enable_if<!llvm::is_one_of<mlir::func::FuncOp, mlir::Operation*, mlir::Region*, mlir::Block*>::value && std::is_same<mlir::WalkResult, mlir::WalkResult>::value, mlir::WalkResult>::type mlir::detail::walk<(mlir::WalkOrder)1, mlir::ForwardIterator, (anonymous namespace)::LiftControlFlowToSCF::runOnOperation()::'lambda'(mlir::func::FuncOp), mlir::func::FuncOp, mlir::WalkResult>(mlir::Operation*, (anonymous namespace)::LiftControlFlowToSCF::runOnOperation()::'lambda'(mlir::func::FuncOp)&&)::'lambda'(mlir::Operation*)>(long, mlir::Operation*) ControlFlowToSCF.cpp:0:0
#16 0x000056551d107e27 mlir::WalkResult mlir::detail::walk<mlir::ForwardIterator>(mlir::Operation*, llvm::function_ref<mlir::WalkResult (mlir::Operation*)>, mlir::WalkOrder) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x131be27)
#17 0x000056551fa8ab97 (anonymous namespace)::LiftControlFlowToSCF::runOnOperation() ControlFlowToSCF.cpp:0:0
#18 0x000056551ff3ad66 mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x414ed66)
#19 0x000056551ff3b690 mlir::detail::OpToOpPassAdaptor::runPipeline(mlir::OpPassManager&, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x414f690)
#20 0x000056551ff3dc62 mlir::PassManager::run(mlir::Operation*) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x4151c62)
#21 0x000056551ff363da performActions(llvm::raw_ostream&, std::shared_ptr<llvm::SourceMgr> const&, mlir::MLIRContext*, mlir::MlirOptMainConfig const&) MlirOptMain.cpp:0:0
#22 0x000056551ff3602d 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
#23 0x000056551ffe1985 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) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x41f5985)
#24 0x000056551ff30015 mlir::MlirOptMain(llvm::raw_ostream&, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer>>, mlir::DialectRegistry&, mlir::MlirOptMainConfig const&) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x4144015)
#25 0x000056551ff302bf mlir::MlirOptMain(int, char**, llvm::StringRef, llvm::StringRef, mlir::DialectRegistry&) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x41442bf)
#26 0x000056551ff305ee mlir::MlirOptMain(int, char**, llvm::StringRef, mlir::DialectRegistry&) (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x41445ee)
#27 0x000056551cfbaf07 main (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x11cef07)
#28 0x00007f25f9eec083 __libc_start_main /build/glibc-LcI20x/glibc-2.31/csu/../csu/libc-start.c:342:3
#29 0x000056551cfbaa7e _start (/data/szy/MLIR/llvm-release/llvm-project/build/bin/mlir-opt+0x11cea7e)
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWk9z27iS_zTwBWUVCP4_-CDL0axrnHU2zswcWSAJSNhAABcAbWsO-9lfAaQkkpKczMSqvPfqVSUWCXaj-9f_0CBIjOErSekNiG9BfHdFWrtW-ublZZsEeXBVqnp7s-IWPlNtuJIgnMOywjmr8jCtkqqMCA4Qy1CVh1WasyqhdZ5WGQpYBtAcoLnZGks3jg8k6LeylbaFQTZD0SyBD1-eQII6Ok0breq2ovCF23VPvxFcX6vGQngtOLPXFbu26tpUDJKZe7bnBmjejzhGNHcP_D93s1F1KygE6S1AcwhZK6uZ-wMbzZ-JpRBEiL7awo0VmppW2IJYqw3AGcAx0SvkpmUhBjiH1yD8AAHOuLtdQN6N7iaHEOC4MhYVPMQQhHfQNFw_zxZKGkukhQi6uRzXkPw6OEd_HRwzoAHh70RzUjp44RzgoBtsrAbhotdw2crKet99cFMAHAc_wg9hz-nMPRNKNTvw3fCtJrJaQxB_KMugs-DOHm62Cd4O2d6OO4wD5nBABHAc7W9zdwUBXgK8hBg2mtbGu98xI0_urnZ285aLB8ifHqgxX9ZEQi_lnG477iG6hZI1dzYhws86ELa7CodQ8FBVp-hez6B3STJQ7H5e10OdojO6PFmlKQQY7z2EsQ-Pni854gM4Tt8QNIjb89hHzkmPRJ10Zfg2fjgJqg3VK7rjT-96Ew3T40GR-gTyE7kSfptrmpKa2laPouIoUh1hp1n_d1JyjCXVV2g1qajLq2MCgJc1sQTgpflzC_Dy48P9Z3dDad3_4Bzgpd00s0C2wf2vv5j_kbsKFwQgnKdOJaq16moeTs8EKMApVA1cECmVhZWSz1Rb2MqvUr1Id2-1EpAJ9eLIrILG6rayrab16OkPJQKIP7wfaKmssyo0lMKq1ZpKC1VDNbH9CgUwPmsM3AVusE-Sye8uojMXwvHt_X__Pn-4v7t9eFz8uocUgPgOgnAB0lsvV9ZPdLWh0j7xP6nxAUe0Jtu-hoZzGDheLzJyZTS984uIVzXjwT5pTv4clpwuq3aLYsd-0qJCPG-uNRWUGLq7bbT6X1pZgJfeoHjJZSXamh4GPOtvht5R9sCNNTO3DAd55gT1TgDh_P7zY-km-oPb9W-GOkoQLg7Pb4Wqvj52ZnFY_eD_n-LygCCIb3vqL9uGeuOdmSy-c5rMjaHaedM1CK2hBd00drubDCcAJy4A-nivqbFabSGBz0S0FNo1sdBYLgRcEwNbQw3AgQ-LFDLCBa1nAM0_PXyYP32Api033EICy3YFNW2Uti5D1tY2xq-XrqCtuF235axSm97UxxbnxrRO0BISWcPe8NCuKaw0MWtYkuqrLxZO9pOvHXW7abrSgWZd3n3SaqXJBhK9al2wmb8dAGXLhcu4ksve-77JmvZYP5CuvmKHCKJXhBCKkzgOKlaTKMigt5B3rtma7uKT5tJ62F98xcTZgUiTl0IZqynZeOcuIJe2c3X2juABvkWvQUBpFPRp5gAEEwApw_QUgM-tfOIrScR_EVkL2neOl9KxZJgedMRTI9ekhiNtXI3pbNYNm1nVuNhC_n83S9jPkjIcM5JVNMIIFq4bdk1GoW2PRfAS4OVrlhRJdC24bF-vV7LtHjR2rSmpZ0bNUKdrFGF00DQaysgZKhEqoSbcuCZmj3kleFldP1T3GL3ub_EsDJwJvf4AL2czd7c1NW1cWrWSv3YDz14V2bpbP_WsAuE8dmtH32qF8UgNSkkW55CUymP8PjVs3dnBc3kJWbc6dRKSqYQU53BFbdFpXJhutSi6kvSdQrm0DrlQpN6YVUU6uTFybXDWC05PCS6kKBxXUasN4fLH5OWpi5ow6gVmY4GsZHXyHZFSuRhJfIyEIauTQ4zkg2jGCAUlYRdJowhjRljeCXaZjsaCWRLTZJDqvBHc2IJvGgHCxaAEuBFacHFyGXTrH14Mp_GzWE24K9-nyHcrJtUeUjbl5dY1Oq7pW0wf1dQSLroRqWpaqMatk6cE4QW0uqXulxFh_MWz4vXxQIdgP9ZduMHLuCVEJKbJwS3BxC0RI-WgP_hMV13P53qM_uZipTcKUcZIeVBuVHoZy3KcZgPlrCbSMKU3i-UvX9TTYglwdqR6t6Ydhne099JSzfxqOKG4UxsuiazovWTKP70M2iCvcZod0IYjtCQrMWIDtf4g4utn__JkEO-s32kVmrJRGA6oR1Z53PfxeO63-H06VEQI1yUVTLrGG2dEKrndqNZASTbUNN5SeUf8wJlddFuXpVAvne27bqKVj3IgI9vzAJwKsilrAnA60shB6K7ctvGx2XN0Ww6l-1m-weP2Uq5EvCnrBHqcCSVX4wiYkMEp1sn67pwXDZ1XByilOD3tvMPgsJ68EPF15MCl0i9E1_f7cvThDSSLdw6JkTUc36OuXZ9zmY4rDErqHLVLhHiSCKRm9CclgrF1v1xIUrp1iPnsCAZLgymUpIUaSz0O0PPxtTiut9PhflGZ77XcdTZ-N7ZXkpvCkA09g__Yq_34aNJvUlm3i3wziEd2HkZPMJ58GuL-xcDPLTwj_d524tg0b-XmTweVdKvYTyuOyX-K47sVx3RaHMs8fd8I-x6PZuPOLCR1kpxx3mPzRT02n4gx85o03lu95JGhHcFR3TtfKOeSiK3h5iORZEV97SiVEu63lf7Irb7gi4woiGidDNrofGKPMsnRX7bHJ95QwSWdBKAj3cNM3t1AQyYn6l4aq_0LMFeS528R7F4Iuwe97p-IptK6zrlvyLoicRkfsCRHex9gNPFBXSV4ovrOGCcjcFrYLqJzHFQJPugcTHROwprAhmq3q5lX3e7y7bd1-8XfrImmddEdLR44nlSrK_px5YrkziWTIHKoXM7TV3vk8I-C68fGfiRcLpRkfDWYI4eDp8dFAuMpOITrQS1-UCteEfGtVu4cA8DZHnsr-f-19Aj7R7pRenvbMtYlwJ6-poy0wu3oBbX0PE_3vmC0gkw9cK5zPGnC7_XlxfEMdrucCFpZ13gaq7fHwfFWAOw6iqhA43bhn8Iz3wjP8X6b0SDP4gFw0whu57L-pFVFjdnp-lOC7l8wJd6kGD57sprL1WfKzg5fqBSzOM_iQymOJtUKoSA-nQf_bll8odU5QsHAvPHUvLhkZ83bNybVmnQtyPyvhsy3bHMxzLhkB8zJFHNM6btg_kngYkoP4NLxuVhJGEphfwBygVO5ijJ02AbhycEIrVAWwqIQvKwKY4m2xV85i6lMuzv06i79Qz-PP5UJI-z-9rLzKXKSUthJvRR2ku4sv__I5aq-Ces8zMkVvQnSMMoSlOfR1fqmwhkhAWMoSUhQ4igsMWNVWuZxGGIWoSt-gxGOAowxyqM8jmYsrlGFqzrOUIrCIAcRohvCxcwpOVN6deUP2G8CjLIsvBKkpML4Lxox7r5twCC-u9I3HlTZrgyIkPCfOOxnsNwK_xWkZ4jvjk7D_Uk9NVetFjd__wOAXsXnG_yPAAAA___9EIS4">