#8638: Optimize by demoting "denormalized" Integers (i.e. J# -> S#) --------------------------------------------+------------------------------ Reporter: hvr | Owner: hvr Type: feature request | Status: patch Priority: normal | Milestone: 7.8.1 Component: libraries (other) | Version: 7.7 Resolution: | Keywords: integer- Operating System: Unknown/Multiple | gmp Type of failure: Runtime performance bug | Architecture: Test Case: | Unknown/Multiple Blocking: | Difficulty: Unknown | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by simonpj): Great. Now, what's happening in `symalg` and `kahan` (+4.7 and 6.7% resp)? Working on these small deltas seems tiresome, but what is a small delta in one program can be a massive one in another. It's not that we must have uniform improvement; just that we like to know ''why'' something gets worse, and deem it an acceptable compromise. What is puzzling to me is that I don't think `smartJ#` does ''any'' allocation (apart from its result) so I don't see why allocation should ever increase. Thanks Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8638#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler