[llvm-bugs] [Bug 41052] New: Assertion `Get(To) == To && "Replacement PHI node is already replaced."' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41052

            Bug ID: 41052
           Summary: Assertion `Get(To) == To && "Replacement PHI node is
                    already replaced."' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: jesper.antonsson at ericsson.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 21590
  --> https://bugs.llvm.org/attachment.cgi?id=21590&action=edit
reproducer for the assert

This assertion in CodeGenPrepare was hit from a Csmith generate. It involves
trying to optimize a store instruction in a dead basic block. Reduced mir test
attached.

-> build-all/bin/llc -run-pass=codegenprepare -o -
codegen-prepare-replacephi.mir 
llc: ../lib/CodeGen/CodeGenPrepare.cpp:2879: void (anonymous
namespace)::SimplificationTracker::ReplacePhi(llvm::PHINode *, llvm::PHINode
*): Assertion `Get(To) == To && "Replacement PHI node is already replaced."'
failed.
Stack dump:
0.      Program arguments: build-all/bin/llc -run-pass=codegenprepare -o -
codegen-prepare-replacephi.mir 
1.      Running pass 'Function Pass Manager' on module
'codegen-prepare-replacephi.mir'.
2.      Running pass 'CodeGen Prepare' on function '@f1'
 #0 0x00000000022a9824 PrintStackTraceSignalHandler(void*)
(build-all/bin/llc+0x22a9824)
 #1 0x00000000022a73f0 llvm::sys::RunSignalHandlers()
(build-all/bin/llc+0x22a73f0)
 #2 0x00000000022a9c68 SignalHandler(int) (build-all/bin/llc+0x22a9c68)
 #3 0x00007f25650ae390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
 #4 0x00007f2563c18428 gsignal
/build/glibc-Cl5G7W/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
 #5 0x00007f2563c1a02a abort /build/glibc-Cl5G7W/glibc-2.23/stdlib/abort.c:91:0
 #6 0x00007f2563c10bd7 __assert_fail_base
/build/glibc-Cl5G7W/glibc-2.23/assert/assert.c:92:0
 #7 0x00007f2563c10c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
 #8 0x00000000017ec352 (anonymous
namespace)::AddressingModeCombiner::combineAddrModes()
(build-all/bin/llc+0x17ec352)
 #9 0x00000000017de2b0 (anonymous
namespace)::CodeGenPrepare::optimizeMemoryInst(llvm::Instruction*,
llvm::Value*, llvm::Type*, unsigned int) (build-all/bin/llc+0x17de2b0)
#10 0x00000000017d50f8 (anonymous
namespace)::CodeGenPrepare::optimizeInst(llvm::Instruction*, bool&)
(build-all/bin/llc+0x17d50f8)
#11 0x00000000017ce2c0 (anonymous
namespace)::CodeGenPrepare::runOnFunction(llvm::Function&)
(build-all/bin/llc+0x17ce2c0)
#12 0x0000000001c41dab llvm::FPPassManager::runOnFunction(llvm::Function&)
(build-all/bin/llc+0x1c41dab)
#13 0x0000000001c42063 llvm::FPPassManager::runOnModule(llvm::Module&)
(build-all/bin/llc+0x1c42063)
#14 0x0000000001c4265f llvm::legacy::PassManagerImpl::run(llvm::Module&)
(build-all/bin/llc+0x1c4265f)
#15 0x000000000073d3a7 compileModule(char**, llvm::LLVMContext&)
(build-all/bin/llc+0x73d3a7)
#16 0x000000000073a9e0 main (build-all/bin/llc+0x73a9e0)
#17 0x00007f2563c03830 __libc_start_main
/build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:325:0
#18 0x0000000000738bf9 _start (build-all/bin/llc+0x738bf9)
Aborted (core dumped)

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