[LLVMdev] Register Class assignment for integer and pointer types

[David Chisnall]

We also have this problem, and have added iPTR types to the back end.  Our pointers are actually fat pointers, so this also requires tweaking some optimisations (for example, things like to turn GEPs with 64-bit offsets into pointer-sized offsets, but our pointers are larger than any integer type that we support...).  Most of the changes are a bit ugly, and I'm loath to upstream them without an in-tree target that has these requirements, or they will be hard for anyone else to keep working.

David

On 21 Jun 2013, at 06:00, 杨勇勇 <triple.yang at gmail.com> wrote:

> llvm code generator lowers both integer and pointer types into ixx(say, i16, i32, i64, ...). This make senses for some optimizations.
> 
> However, integer registers and pointer registers is expilicitly distinguished from each other for some architectures, like TriCore, Blackfin, and our lab prototype dsp, which accelerates address computation and memory access.
> 
> I have already read this mail thread: http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-May/022142.html , and I am wondering how is the progress about it.
> 
> Thanks.
> 
> -- 
> 杨勇勇 (Yang Yong-Yong)
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