[LLVMdev] Re: LLVMdev Digest, Vol 16, Issue 14

[Yiping Fan]

>
> ------------------------------
>
> Message: 3
> Date: Tue, 18 Oct 2005 15:20:29 -0500
> From: "Robert L. Bocchino Jr." <bocchino at uiuc.edu>
> Subject: [LLVMdev] Vector LLVM checked in!
> To: LLVM Developers Mailing List <llvmdev at cs.uiuc.edu>
> Message-ID: <64dde68b5934d83056aeb3c9f66afe7e at uiuc.edu>
> Content-Type: text/plain; charset="windows-1252"
>
> Hi,
>
> As advertised to some, I've checked in a BETA VERSION of my vector
> extensions to LLVM.  It is checked in as a CVS branch off of the main
> line.  You can get the branch by doing a normal llvm checkout and
> adding the argument -r vector_llvm.  E.g., to check out from anonymous
> CVS, you would do this:
>
>         •       cvs -d :pserver:anon at llvm-cvs.cs.uiuc.edu:/var/cvs/llvm login
>         •       Hit the return key when prompted for the password.
>         •       cvs -z3 -d :pserver:anon at llvm-cvs.cs.uiuc.edu:/var/cvs/llvm co -r
> vector_llvm llvm
>
> This will produce a fresh tree with the Vector LLVM stuff in it.
>
> Vector LLVM consists of three main components:
>
> 1. Extensions to the VM core to support both fixed and variable
> vectors, and operations on them (the fixed vectors subsume the 'Packed
> Type' from regular LLVM).
>
> 2. A C API and supporting LLVM transformation for writing Vector LLVM
> at the C level using special functions that can be integrated with
> "normal" scalar code, compiled through llvm-gcc, and turned into Vector
> LLVM.
>
> 3. Very rudimentary backend support for turning fixed vectors into
> AltiVec and/or SSE via the C backend and the gcc SIMD intrinsics for C.
>
> I've also written a backend for the Motorola RSVP coprocessor
> architecture that uses variable length vectors, but I can't check this
> in because it's proprietary.
>
> #1 above is documented in llvm/src/docs/LangRef.html.  I'm working on
> documentation for #2 and #3.
>
> Feel free to check it out Vector LLVM and play with it.
> Comments/suggestions are welcome.
>
> Rob
>
> Robert L. Bocchino Jr.
> Ph.D. Student, Computer Science
> University of Illinois, Urbana-Champaign
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>


Bob, do you have an example to show how to specify vectors and their
operations in C?
I.e., is the documentation of the item #2 ready?

Thanks,
-Yiping
--
VLSI CAD Lab,
Computer Science Department, UCLA