#13360: Add a flag to enable inferring HasCallStack constraints -------------------------------------+------------------------------------- Reporter: gridaphobe | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 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 saurabhnanda):
You're right that the cost of adding a CallStack should be roughly equivalent to passing another argument around, plus the cost of allocating each source location in the stack.
I'm amazed that this operation ends up causing a 2-3x slowdown, although, to be fair, the scale is in the range of ~100ns. I think a more realistic benchmark would be wrt actual IO or parsing, where the time-scale of underlying operations will outweigh the minor performance hit added by HasCallstack. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13360#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler