#15333: Weird cachegrind results for binary-trees -------------------------------------+------------------------------------- Reporter: sgraf | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Research Component: NoFib benchmark | needed suite | Version: 8.5 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by sgraf): I'm still not really sure what's going on, but I feel like alignment instructions might skew cachegrinds instruction counts according to [http://valgrind.org/docs/manual/cg-manual.html section 5.2.10 of the valgrind manual]. I've had a few other cases in the meantime. Passing `-fllvm -optlo -Os` to use the LLVM backend optimising for code size helps. Is there some equivalent for the NCG? That would be far more reliable for the counted instruction metric that our benchmark CI relies on. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15333#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler