[llvm-bugs] [Bug 47517] New: SelectionDAG.cpp:900: bool llvm::SelectionDAG::RemoveNodeFromCSEMaps(llvm::SDNode *): Assertion `N->getOpcode() != ISD::DELETED_NODE && "DELETED_NODE in CSEMap!"' failed. with llc -O1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47517

            Bug ID: 47517
           Summary: SelectionDAG.cpp:900: bool
                    llvm::SelectionDAG::RemoveNodeFromCSEMaps(llvm::SDNode
                    *): Assertion `N->getOpcode() != ISD::DELETED_NODE &&
                    "DELETED_NODE in CSEMap!"' failed. with llc -O1
           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: mikael.holmen at ericsson.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 23955
  --> https://bugs.llvm.org/attachment.cgi?id=23955&action=edit
bbi-47255.ll reproducer

llc -O1 -o - bbi-47255.ll

results in

        .text
        .file   "bbi-47255.ll"
llc: ../lib/CodeGen/SelectionDAG/SelectionDAG.cpp:900: bool
llvm::SelectionDAG::RemoveNodeFromCSEMaps(llvm::SDNode *): Assertion
`N->getOpcode() != ISD::DELETED_NODE && "DELETED_NODE in CSEMap!"' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: build-all/bin/llc -O1 -o - bbi-47255.ll 
1.      Running pass 'Function Pass Manager' on module 'bbi-47255.ll'.
2.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@f'
 #0 0x00000000025d2c84 PrintStackTraceSignalHandler(void*)
(build-all/bin/llc+0x25d2c84)
 #1 0x00000000025d07fe llvm::sys::RunSignalHandlers()
(build-all/bin/llc+0x25d07fe)
 #2 0x00000000025d2f9c SignalHandler(int) (build-all/bin/llc+0x25d2f9c)
 #3 0x00007f7f4f6c88a0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x128a0)
 #4 0x00007f7f4e171f47 raise
/build/glibc-2ORdQG/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f7f4e1738b1 abort /build/glibc-2ORdQG/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f7f4e16342a __assert_fail_base
/build/glibc-2ORdQG/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f7f4e1634a2 (/lib/x86_64-linux-gnu/libc.so.6+0x304a2)
 #8 0x00000000023be964 llvm::SelectionDAG::RemoveNodeFromCSEMaps(llvm::SDNode*)
(build-all/bin/llc+0x23be964)
 #9 0x00000000023bec4f llvm::SelectionDAG::DeleteNode(llvm::SDNode*)
(build-all/bin/llc+0x23bec4f)
#10 0x000000000226da96 (anonymous
namespace)::DAGCombiner::recursivelyDeleteUnusedNodes(llvm::SDNode*)
(build-all/bin/llc+0x226da96)
#11 0x000000000226e990 llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level) (build-all/bin/llc+0x226e990)
#12 0x0000000002416372 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(build-all/bin/llc+0x2416372)
#13 0x0000000002415392
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(build-all/bin/llc+0x2415392)
#14 0x00000000024119ce
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(build-all/bin/llc+0x24119ce)
#15 0x00000000012f6da5 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(build-all/bin/llc+0x12f6da5)
#16 0x0000000001abf979
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(build-all/bin/llc+0x1abf979)
#17 0x0000000001eb83bf llvm::FPPassManager::runOnFunction(llvm::Function&)
(build-all/bin/llc+0x1eb83bf)
#18 0x0000000001ebec58 llvm::FPPassManager::runOnModule(llvm::Module&)
(build-all/bin/llc+0x1ebec58)
#19 0x0000000001eb898d llvm::legacy::PassManagerImpl::run(llvm::Module&)
(build-all/bin/llc+0x1eb898d)
#20 0x00000000006c306d main (build-all/bin/llc+0x6c306d)
#21 0x00007f7f4e154b97 __libc_start_main
/build/glibc-2ORdQG/glibc-2.27/csu/../csu/libc-start.c:344:0
#22 0x00000000006c09aa _start (build-all/bin/llc+0x6c09aa)
Abort (core dumped)

This is new, it starts crashing with deb4b25807:

    [DAGCombine] Don't delete the node if it has uses immediately

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