; bin/opt -passes=simplifycfg<switch-range-to-icmp> test.ll -S 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" target triple = "x86_64-unknown-linux-gnu" define fastcc i32 @func_285(i1 %tobool271) { entry: br label %if.then102 if.then102: ; preds = %if.then102, %if.then102, %entry switch i1 %tobool271, label %default.unreachable [ i1 false, label %if.then102 i1 true, label %if.then102 ] default.unreachable: ; preds = %if.then102 %conv257.1.lcssa = phi i32 [ 0, %if.then102 ] ret i32 %conv257.1.lcssa } 

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug. Stack dump: 0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/opt -o /app/output.s -S -passes=simplifycfg<switch-range-to-icmp> <source> 1.	Running pass "function(simplifycfg<bonus-inst-threshold=1;no-forward-switch-cond;switch-range-to-icmp;no-switch-to-arithmetic;no-switch-to-lookup;keep-loops;no-hoist-common-insts;no-hoist-loads-stores-with-cond-faulting;no-sink-common-insts;speculate-blocks;simplify-cond-branch;no-speculate-unpredictables>)" on module "<source>" 2.	Running pass "simplifycfg<bonus-inst-threshold=1;no-forward-switch-cond;switch-range-to-icmp;no-switch-to-arithmetic;no-switch-to-lookup;keep-loops;no-hoist-common-insts;no-hoist-loads-stores-with-cond-faulting;no-sink-common-insts;speculate-blocks;simplify-cond-branch;no-speculate-unpredictables>" on function "func_285" #0 0x0000000005975828 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x5975828) #1 0x00000000059726d4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0 #2 0x000073a3a8042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520) #3 0x0000000004c4aabb (anonymous namespace)::SimplifyCFGOpt::simplifySwitch(llvm::SwitchInst*, llvm::IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter>&) SimplifyCFG.cpp:0:0 #4 0x0000000004c52343 llvm::simplifyCFG(llvm::BasicBlock*, llvm::TargetTransformInfo const&, llvm::DomTreeUpdater*, llvm::SimplifyCFGOptions const&, llvm::ArrayRef<llvm::WeakVH>) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x4c52343) #5 0x000000000484f644 iterativelySimplifyCFG(llvm::Function&, llvm::TargetTransformInfo const&, llvm::DomTreeUpdater*, llvm::SimplifyCFGOptions const&) SimplifyCFGPass.cpp:0:0 #6 0x0000000004850594 simplifyFunctionCFGImpl(llvm::Function&, llvm::TargetTransformInfo const&, llvm::DominatorTree*, llvm::SimplifyCFGOptions const&) SimplifyCFGPass.cpp:0:0 #7 0x0000000004851715 simplifyFunctionCFG(llvm::Function&, llvm::TargetTransformInfo const&, llvm::DominatorTree*, llvm::SimplifyCFGOptions const&) SimplifyCFGPass.cpp:0:0 #8 0x000000000485185a llvm::SimplifyCFGPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x485185a) #9 0x00000000016dcc3e llvm::detail::PassModel<llvm::Function, llvm::SimplifyCFGPass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x16dcc3e) #10 0x000000000574f081 llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x574f081) #11 0x0000000000efc57e llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xefc57e) #12 0x000000000574d6fa llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x574d6fa) #13 0x000000000097bade llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x97bade) #14 0x000000000574d0b1 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x574d0b1) #15 0x0000000000985c7a llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x985c7a) #16 0x0000000000979ef1 optMain (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x979ef1) #17 0x000073a3a8029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90) #18 0x000073a3a8029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40) #19 0x0000000000971305 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x971305) Program terminated with signal: SIGSEGV Compiler returned: 139