#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: | Unknown/Multiple Type of failure: Runtime | Test Case: performance bug | numeric/num009 Blocked By: | Blocking: Related Tickets: #13570 | Differential Rev(s): Phab:D3508 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Perhaps I'll just start a table of the PMU counters before and after, ||= Metric =||= Before patch =||= After patch =|| || instructions || 12,346,134,565 || 9,146,722,334 || || branches || 1,308,583,802 || 908,661,442 || || branch predict misses || || || || cache-misses || 83,983 || 57,490 || || L1-icache-load-misses || 138,869 || 156,777 || -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13629#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler