VECTORISE is for Data Parallel Haskell. It's only relevant to GHC's internal vectorisation pass - I don't actually think there is any use case for it in user code at the moment, it's only used by the DPH libraries/special prelude, etc. On Thu, Aug 11, 2011 at 12:16 PM, Henning Thielemann wrote:

On 09.08.2011 22:01, Ian Lynagh wrote:

...

The GHC Team is pleased to announce a new major release of GHC, 7.2.1.

The 7.2 branch is intended to be more of a "technology preview" than normal GHC stable branches; in particular, it supports a significantly improved version of DPH, as well as new features such as compiler plugins and "safe Haskell". The design of these new features may evolve as we get more experience with them. See the release notes for more details of what's new and what's changed.

These sound like a lot of exciting news. The release notes also mention a VECTORISE pragma, that is not mentioned in   http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/pragmas.html and not in the index. Is it about the planned GHC support for SSE/AltiVec vector units or is it about DPH?

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-- Regards, Austin