llvm dev - Feb 2012 - [LLVMdev] Restrictions on bitcast of arbitrary vector types?

Hi,

The LLVM lang ref (http://llvm.org/docs/LangRef.html#i_bitcast) notes 
that bitcast of vectors to vectors is OK, provided the vectors are of 
the same size. In attempting this on large vector types (e.g. 16xi64 -> 
16xf64), I get assertions related to Extended Value Types when 
attempting to perform code generation, but no errors at the BC level. Is 
it simply unsupported to stray outwith the set of vector types in 
SimpleValueType in ValueTypes.h ?

Cheers,
George

-- 
George Russell
Director of Quality Assurance
Codeplay Software Ltd
45 York Place, Edinburgh, EH1 3HP
Tel: 0131 466 0503
Fax: 0131 557 6600
Website: http://www.codeplay.com
Twitter: https://twitter.com/codeplaysoft

This email and any attachments may contain confidential and /or privileged
information and  is for use  by the addressee only. If you are not the intended
recipient, please notify Codeplay Software Ltd immediately and delete the
message from your computer. You may not copy or forward it,or use or disclose
its contents to any other person. Any views or other information in this message
which do not relate to our business are not authorized by Codeplay software Ltd,
nor does this message form part of any contract unless so stated.

As internet communications are capable of data corruption Codeplay Software Ltd
does not accept any responsibility for any changes made to this message after it
was sent. Please note that Codeplay Software Ltd does not accept any liability
or responsibility for viruses and it is your responsibility to scan any
attachments.
Company registered in England and Wales, number: 04567874
Registered office: 81 Linkfield Street, Redhill RH1 6BY

Hi George,
> The LLVM lang ref (http://llvm.org/docs/LangRef.html#i_bitcast) notes
> that bitcast of vectors to vectors is OK, provided the vectors are of
> the same size. In attempting this on large vector types (e.g. 16xi64 ->
> 16xf64), I get assertions related to Extended Value Types when
> attempting to perform code generation, but no errors at the BC level. Is
> it simply unsupported to stray outwith the set of vector types in
> SimpleValueType in ValueTypes.h ?
this sounds like a bug - the type legalizer should take care of this.

Ciao, Duncan.