#10678: integer-gmp's runS seems unnecessarily expensive -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 (CodeGen) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by rwbarton): I am working on a patch that adds such a `runRW#` function with special treatment in CorePrep, since it seems easy and most of the work could be reused for the special primop approach anyways. No benchmarks yet but it does produce the expected Cmm without the floating-out problems of `inlinePerformIO` in my simple test, and it passes validate (which might not greatly stress this case, but the new `runRW#` is being used from integer-gmp and I guess also from bytestring via `unsafeDupablePerformIO`). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10678#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler