[LLVMdev] fix-point support

[Duncan Sands]

Hi Jonas,

>>>/  is there any work ongoing in the area of fix-point support for LLVM?
> />
>>not as far as I know.
>>
>>>/  If not, what would be required to implement it?
> />
>>I assume you are talking about support for fixed point in the clang
>>front-end, rather than LLVM itself, since in LLVM IR presumably it
>>would just be represented as operations on integers, or library calls.
>>If indeed you want clang support you should ask on the clang mailing
>>list.
>>
>>Ciao,
>>
>>Duncan.
>>
>
> Hi Duncan,
>
> no, actually, I want to use special instructions in the ISA that handles fix-point operands,
> so I need a new type in the LLVM I/R and in the code-generator, I think, as well as in Clang.

to get started you could use integer types in the LLVM IR and create LLVM
intrinsics that represent the fixed point operations.  Introducing new types
is a lot of work, so best to work incrementally if possible.

Ciao,

Duncan.