Re: [GHC] #9303: O2: (GHC version 7.8.3 for x86_64-unknown-linux): allocateRegsAndSpill: Cannot read from uninitialized register %vI_s1Mp

#9303: O2: (GHC version 7.8.3 for x86_64-unknown-linux): allocateRegsAndSpill: Cannot read from uninitialized register %vI_s1Mp -------------------------------------+------------------------------------- Reporter: slyfox | Owner: simonmar Type: bug | Status: new Priority: highest | Milestone: 7.8.4 Component: Compiler | Version: 7.8.3 (NCG) | Keywords: Resolution: | Architecture: x86_64 (amd64) Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Compile- | Related Tickets: time crash | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by Simon Marlow ): In [changeset:"da70f9ef49a545707dc32db9662441b9c8845fba/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="da70f9ef49a545707dc32db9662441b9c8845fba" Allow multiple entry points when allocating recursive groups (#9303) Summary: In this example we ended up with some code that was only reachable via an info table, because a branch had been optimised away by the native code generator. The register allocator then got confused because it was only considering the first block of the proc to be an entry point, when actually any of the info tables are entry points. Test Plan: validate Reviewers: simonpj, austin Subscribers: simonmar, relrod, carter Differential Revision: https://phabricator.haskell.org/D88 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9303#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler