[llvm-commits] Patch: LegalizeType for promoting some operands

[Mon Ping Wang]

Hi,

This is a patch to add some support to legalize some operands
   - ExpandOp_SCALAR_TO_VECTOR by using build vector

   - ExpandOp_INSERT_VECTOR_ELT by bit casting the input vector to the  
expand type, insert the expanded operand, and casting it back.

  - A modification to PromoteIntRes_EXTRACT_VECTOR_ELT to check if the  
extract vector element type is the expected promoted type and if not,  
then extend the result.

For the last one, I ran into the case where I was doing a add of two 8  
bit integers where one integer is extracted from a vector element  
where only a 32 bit was available.  In the promotion code, the first  
operand was promoted to 32 bits but the extract vector element was  
promoted to 16 bits.  This causes a problem when the add was promoted  
to 32 bits and checked its two input operand type.

Please let me know if you have any comments.

Thanks,
   -- Mon Ping

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