#8834: 64-bit windows cabal.exe segfaults in GC ----------------------------------+---------------------------------- Reporter: awson | Owner: Type: bug | Status: patch Priority: highest | Milestone: 7.8.1 Component: Compiler | Version: 7.8.1-rc2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: ----------------------------------+---------------------------------- Comment (by simonmar): It's looking more likely that there is a bug related to caller-saves registers somewhere else, and the change to `isTrivial` tickles it by making `CmmSink` more eager to inline `GlobalReg`s. This is affecting Win64 because that platform has a different C calling convention, with different caller-saves registers. So either we have a bad optimisation (probably in `CmmSink`), or the specification for what is a caller-saves reg on Win64 is wrong (`includes/stg/MachRegs.h`). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8834#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler