woops, heres the ticket http://hackage.haskell.org/trac/ghc/ticket/8033
On Tue, Jul 2, 2013 at 10:27 PM, Carter Schonwald < [email protected]> wrote: > I've added a ticket to trac proposing the change I believe we'd need to > hand over to the LLVM folks to support 256bit simd, > > should be fully compatible with current ghcs and how they do code > generation > > feedback would of course be appreciated > > > On Tue, Jul 2, 2013 at 8:03 PM, Carter Schonwald < > [email protected]> wrote: > >> 1-2 typoes may have made it unclear. >> >> Avx2 machines (intel haswell CPUs) have a rich array of 256bit simd >> registers. And lots of useful instructions for them. >> >> The ghc calling convention in llvm currently only exposes being able to >> use those simd registers in their 128 bit form. >> >> Would be backwards compatible and future proof to add support for the >> 256bit registers in the calling convention spec in llvm. >> >> If there's a clear concensus on this, I'm happy / willing to do the work >> to try and get that patch under consideration for the next llvm point >> release. >> >> >> On Tuesday, July 2, 2013, Carter Schonwald wrote: >> >>> Which reminds me: should we look into getting a patch into llvm'd ghc >>> calling convention so that on avx2 capable machines so we can eventually >>> add support for the 256bit Ymm resisters and primops to ghc? We really >>> should make sure it's patched in on the llvm side first. >>> >>> I believe it'd be a 2 line patch, might even be something we could get >>> into the next llvm point release if there's a clear agreement about it too. >>> >>> Thoughts? I'm happy to put a ticket on trac for this andor do the leg >>> work to make it happen if everyone agrees. >>> >>> >>> On Tuesday, July 2, 2013, Ryan Newton wrote: >>> >>>> Gosh, sorry, yes it's not obvious from the list of accepted papers: >>>> >>>> "Automatic SIMD Vectorization for Haskell" Leaf Petersen, Dominic >>>> Orchard and Neal Glew >>>> One of the authors has a link for it but it appears there's no preprint >>>> up yet: >>>> http://www.leafpetersen.com/leaf/publications.htm >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Tue, Jul 2, 2013 at 5:36 AM, Nicolas Trangez >>>> <[email protected]>wrote: >>>> >>>>> On Mon, 2013-07-01 at 12:05 -0400, Ryan Newton wrote: >>>>> > Err, GCC replacement. But, ironically, GHC [backend] replacement as >>>>> well, >>>>> > as of the recent ICFP paper. >>>>> >>>>> Got a link or reference? >>>>> >>>>> Nicolas >>>>> >>>>> >>>>> _______________________________________________ >>>>> ghc-devs mailing list >>>>> [email protected] >>>>> http://www.haskell.org/mailman/listinfo/ghc-devs >>>>> >>>> >>>> >
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