#9155: allocateRegsAndSpill: Cannot read from uninitialized register %vI_s154O (GHC version 7.8.2 for x86_64-unknown-linux) ------------------------------------+------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- When building all world with '''-O2''' I've stuck on wxhaskell (all versions): {{{ [11 of 16] Compiling Graphics.UI.WX.Controls ( src/Graphics/UI/WX/Controls.hs, dist/build/Graphics/UI/WX/Controls.o ) <no location info>: ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-unknown-linux): allocateRegsAndSpill: Cannot read from uninitialized register %vI_s154O }}} I've stripped it down to minimal complete example (but it significantly changed error message) {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-unknown-linux): RegAlloc.Liveness.computeLivenss SCCs aren't in reverse dependent order bad blockId c1tU [NONREC c1uc: movq $-8,%rbx andq $main:M.AlignLeft{v rb}_closure+1,%rbx addq $8,%rbp jmp *(%rbx), NONREC ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9155 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler