#13629: sqrt should use machine instruction on x86_64 -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler (NCG) | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #13570 | Differential Rev(s): Phab:D3508 Wiki Page: | -------------------------------------+------------------------------------- Description changed by kavon: @@ -4,0 +4,3 @@ + + See discussion [https://mail.haskell.org/pipermail/ghc- + devs/2017-April/014168.html here] as well. New description: The NCG currently implements the square root MachOp with an out-of-line call. This resulted in a large performance regression in `n-body` (see #13570). Fix this. See discussion [https://mail.haskell.org/pipermail/ghc- devs/2017-April/014168.html here] as well. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13629#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler