#14989: "Each block should be reachable from only one ProcPoint" compiling `integer` with `-fllvm` -------------------------------------+------------------------------------- Reporter: sgraf | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.5 Keywords: | Operating System: Windows Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The attached file is from reduced from NoFib's `spectral/integer`. When I compile this with `-O2 -fllvm`, I get the following panic on HEAD: {{{ ghc-stage2.exe: panic! (the 'impossible' happened) (GHC version 8.5.20180329 for x86_64-unknown-mingw32): Each block should be reachable from only one ProcPoint }}} FWIW, I don't have the LLVM toolchain installed, but this is still in GHC's backend. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14989 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler