[LLVMdev] Unimplemented documentation

[Lennart Augustsson]

By expanded instructions I meant trying to do what fcmp on a vector
would do, but with scalar comparisons and building a bit vector.  It's
bug report 3383.

  -- Lennart

On Sat, Jan 24, 2009 at 5:01 PM, Dan Gohman <gohman at apple.com> wrote:
> On Jan 24, 2009, at 4:34 AM, Lennart Augustsson
> <lennart at augustsson.net> wrote:
>
>> Hi,
>>
>> Is there some documentation about what has not been implemented yet?
>
> I've started adding notes to
> docs/LangRef.html
>
> Historically this document has been used to describe just the LLVM IR,
> and not what specific consumers of it do or don't support, but codegen
> is a very important consumer, so I've started adding notes about its
> limitations.
>
>>
>> I'm trying to use vectors and I just run into one thing after another
>> that seem to be missing.
>> (I.e., fcmp on vectors doesn't work; trying to do the same thing with
>> expanded instructions doesn't work; select on a vector doesn't work)
>
> A common thread here is that the code generator doesn't support
> vectors of booleans very well yet. Comparisons and selects are very
> useful (and are also the first step towards more advanced conditional
> vector support), so we'd really like to see this fixed, though it will
> depend on  someone stepping forward to do the work.
>
> What do you mean by "expanded instructions"?
>
> Dan
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>