#13629: sqrt should use machine instruction on x86_64 -------------------------------------+------------------------------------- Reporter: bgamari | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.4.1 Component: Compiler (NCG) | Version: 8.0.1 Resolution: fixed | 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 kavon): This is really interesting, thanks for looking into it! I'm not sure whether there are real programs that will benefit if we inline this library call by using x87 instructions. I'll leave that to someone who has a better intuition about whether there are graphics/mathematics programs that would appreciate the attention. We're at least no worse than C/C++ in this regard, though we probably pay a slightly higher call-site penalty due to a register mismatch between C and GHC conventions. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13629#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler