#15580: Specialize min/max functions for GHC provided instances. -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: (none) Type: task | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Keywords: CodeGen | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- In particular for Int/Word/Float/Double we should aim to provide branchless code where reasonable. Especially when using SSE we should just use `minss` instead of {{{ ucomisd %xmm1,%xmm0 jp .Lc5vv jbe .Lc5vw }}} which is worse in all kinds of ways. If someone feels like tackling this I'm happy to help with code review, answering questions, etc. I won't get around to doing it myself any time soon. As a starting point the instance declarations are in ghc- prim/GHC/Classes.hs. I would look into solving this via adding a new MachOP/PrimOP but maybe there are even better ways. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15580 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler