#8971: Native Code Generator for 8.0.1 is not as optimized as 7.6.3... -------------------------------------+------------------------------------- Reporter: GordonBGood | Owner: Type: bug | Status: new Priority: normal | Milestone: 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: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by GordonBGood): Replying to [comment:30 bgamari]:
I'm de-milestoning this due to a lack of developer interest. Currently we have many bugs and few developers; many of these bugs affect platforms far more common than i386 and these are the bugs we will focus on.
I agree that this issue isn't all that important in the Great Scheme Of Things given that the Native Code Generator (NCG) is gradually being relegated to just a builder for quick-cycle debugging purposes as the (slower compiling, but producing generally faster code) LLVM back end becomes more and more stable (and usable, especially if the required LLVM files, including patches, are distributed with/made available for each GHC version starting with 8.2.1, as promised[https://ghc.haskell.org/trac/ghc/wiki/ImprovedLLVMBackend]). Much more important are performance bugs that affect '''both''' the NCG and LLVM back ends such as the (I'm beginning to think related to each other) #12798 and #12808 pair of issues that although only slowing performance by up to 40% or so (although for all platforms instead of only x86 by 100% as here), affect the perception that GHC code is "slower than Cee" and for which there is no workaround such as choosing an alternate back end. I'll monitor this and will probably either close the issue or at least reduce its priority if version 8.2.1 integrates the LLVM back end as well as it promises. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8971#comment:31 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler