#14619: Output value of program changes upon compiling with -O optimizations -------------------------------------+------------------------------------- Reporter: sheaf | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Incorrect result | (amd64) at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by carter): * priority: high => highest * milestone: 8.6.1 => 8.4.1 Comment: Slyfox on irc was suggesting this is some sort of bug in caller/callee save convention on the 64bit windows mingw path. That disabling the cmm sink pass or using llvm backend resolve this issue is evidence that some register allocation related error only on that platform. Since this is a tier 1 platform And this seems to be a case of silently incorrect programs on a tier 1 platform , I’m marking this as highest priority. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14619#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler