Sanjiv
1
Reframing and Reposting my earlier query:
My target has 16-bit registers for indirect address of data.
All other registers are 8-bit.
Therefore I have added regclasses for i8 and i16 types.
All arithmetic operations (including pointer arithmetic ) are 8-bit operations.
The problem is that LLVM does not expand i16 operations to i8 operations in presence of i16 regclass.
What is the best way to tackle this?
Do I need to custom lower arithmetic operations during Legalize using LowerOperation ( )?
Reframing and Reposting my earlier query:
My target has 16-bit registers for indirect address of data.
All other registers are 8-bit.
Therefore I have added regclasses for i8 and i16 types.
All arithmetic operations (including pointer arithmetic ) are 8-bit operations.
The problem is that LLVM does not expand i16 operations to i8 operations in presence of i16 regclass.
What is the best way to tackle this?
Do I need to custom lower arithmetic operations during Legalize using LowerOperation ( )?
What happens if you mark i16 arithmetic operations expand? i.e. setOperationAction(ISD::ADD, MVT::i16, Expand);
Evan