I'm curious about the plans forward with this. Test-bed to improve 'stock'
GHC & back-end(s)? An actual full-fledged (& maintained) back-end? ...
Nicolas
On Jul 3, 2013 8:48 PM, "Ryan Newton"
This came up randomly because of a typo, but rather than respond for them
I've changed the thread name to something descriptive and copies the authors of the paper.
The small bit that I know: It is a new backend that takes Core from GHC and does the rest itself
There are some patches to GHC (somewhere?) to support a new kind of initialization-only vector. The IFLC backend uses a strict intermediate representation and performs auto-vectorization on loops. In particular, the paper evaluates the technique on loops from (slightly modified) REPA and vector library code. It handles a pretty sizable subset of the language, but is missing some
(including having a non-GHC runtime). things (e.g. asynchronous exceptions).
It is not released yet On Tue, Jul 2, 2013 at 7:54 PM, Carter Schonwald < carter.schonwald@gmail.com> wrote:
What branch is that work in? I've not seen mention of it in the commit
logs. I'd really love to see how they're Doing it.
Likewise, it's worth remarking that a carefullywritten simd primop that
explicitly uses the instruction intrinsics can easily be 1.5-2x faster than auto vectorized simd code. I've some examples I tested for matrix multiplication where the performance is robustly In that range.
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
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
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