[PATCH] D99205: Add jump-threading optimization for deterministic finite automata

[Diogo N. Sampaio via Phabricator via llvm-commits]

dnsampaio added a comment.

@jkreiner with both llvm 12 and head I get a compiler crash in this function for file F17082111 <https://reviews.llvm.org/F17082111>. Just run `opt --dfa-jump-threading`. Sorry, I couldn't reduce it further, I just don't know how to get bugpoint to work with opt.
With a llvm-12 in debug build I get:

  opt --dfa-jump-threading -S < fail.ll
  opt: /work1/dsampaio/csw/llvm-project/llvm/include/llvm/IR/Instructions.h:2767: llvm::Value *llvm::PHINode::getIncomingValueForBlock(const llvm::BasicBlock *) const: Assertion `Idx >= 0 && "Invalid basic block argument!"' failed.
  PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
  Stack dump:
  0.      Program arguments: opt --dfa-jump-threading -S
  1.      Running pass 'Function Pass Manager' on module '<stdin>'.
  2.      Running pass 'DFA Jump Threading' on function '@main'
   #0 0x00007f6a3415119a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /work1/dsampaio/csw/llvm-project/llvm/lib/Support/Unix/Signals.inc:565:11
   #1 0x00007f6a3415136b PrintStackTraceSignalHandler(void*) /work1/dsampaio/csw/llvm-project/llvm/lib/Support/Unix/Signals.inc:632:1
   #2 0x00007f6a3414f95b llvm::sys::RunSignalHandlers() /work1/dsampaio/csw/llvm-project/llvm/lib/Support/Signals.cpp:70:5
   #3 0x00007f6a34151ae1 SignalHandler(int) /work1/dsampaio/csw/llvm-project/llvm/lib/Support/Unix/Signals.inc:407:1
   #4 0x00007f6a32d7a980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
   #5 0x00007f6a32076fb7 raise /build/glibc-S9d2JN/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
   #6 0x00007f6a32078921 abort /build/glibc-S9d2JN/glibc-2.27/stdlib/abort.c:81:0
   #7 0x00007f6a3206848a __assert_fail_base /build/glibc-S9d2JN/glibc-2.27/assert/assert.c:89:0
   #8 0x00007f6a32068502 (/lib/x86_64-linux-gnu/libc.so.6+0x30502)
   #9 0x00007f6a344eb474 llvm::PHINode::getIncomingValueForBlock(llvm::BasicBlock const*) const /work1/dsampaio/csw/llvm-project/llvm/include/llvm/IR/Instructions.h:2768:29
  #10 0x00007f6a35a37265 (anonymous namespace)::AllSwitchPaths::run() /work1/dsampaio/csw/llvm-project/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp:532:24
  #11 0x00007f6a35a36826 (anonymous namespace)::DFAJumpThreading::run(llvm::Function&) /work1/dsampaio/csw/llvm-project/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp:1149:23
  #12 0x00007f6a35a36c1f (anonymous namespace)::DFAJumpThreadingLegacyPass::runOnFunction(llvm::Function&) /work1/dsampaio/csw/llvm-project/llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp:164:5
  #13 0x00007f6a3440f84c llvm::FPPassManager::runOnFunction(llvm::Function&) /work1/dsampaio/csw/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1435:23
  #14 0x00007f6a34414ac5 llvm::FPPassManager::runOnModule(llvm::Module&) /work1/dsampaio/csw/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1481:16
  #15 0x00007f6a34410214 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /work1/dsampaio/csw/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1550:23
  #16 0x00007f6a3440fd38 llvm::legacy::PassManagerImpl::run(llvm::Module&) /work1/dsampaio/csw/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:541:16
  #17 0x00007f6a34414dd1 llvm::legacy::PassManager::run(llvm::Module&) /work1/dsampaio/csw/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1677:3
  #18 0x0000000000472e17 main /work1/dsampaio/csw/llvm-project/llvm/tools/opt/opt.cpp:998:3
  #19 0x00007f6a32059bf7 __libc_start_main /build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:344:0
  #20 0x000000000043577a _start (/work1/dsampaio/csw/devimage/toolchain_default/toolroot/opt/kalray/accesscore/bin/opt+0x43577a)
  Aborted (core dumped)


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