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 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 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 _______________________________________________
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