Re: [GHC] #11649: LLVM code generator produces mal-formed LLVM blocks

#11649: LLVM code generator produces mal-formed LLVM blocks -------------------------------------+------------------------------------- Reporter: bgamari | Owner: erikd Type: bug | Status: patch Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc2 (CodeGen) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: #9043 | Differential Rev(s): Phab:D1996 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"92821ec9a57817e1429ae94c756539259488b728/ghc" 92821ec9/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="92821ec9a57817e1429ae94c756539259488b728" LlvmCodeGen: Fix generation of malformed LLVM blocks Commit 673efccb3b uncovered a bug in LLVM code generation that produced LLVM code that the LLVM compiler refused to compile: { clpH: br label %clpH } This may well be a bug in LLVM itself. The solution is to keep the existing entry label and rewrite the function as: { clpH: br label %nPV nPV: br label %nPV } Thanks to Ben Gamari for pointing me in the right direction on this one. Test Plan: Build GHC with BuildFlavour=quick-llvm Reviewers: hvr, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1996 GHC Trac Issues: #11649 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11649#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler