[PATCH][TableGen] Allow shift operators to take bits<n>

[Hal Finkel]

----- Original Message -----
> From: "Adam Nemet" <anemet at apple.com>
> To: "llvm-commits" <llvm-commits at cs.uiuc.edu>
> Sent: Wednesday, July 16, 2014 7:51:42 PM
> Subject: [PATCH][TableGen] Allow shift operators to take bits<n>
> 
> 
> 
> Convert the operand to int if possible, i.e. if the value is properly
> initialized. (I suppose there is further room for improvement here to
> also
> perform the shift if the uninitialized bits are shifted out.)
> 
> With this little change we can now compute the scaling factor for
> compressed
> displacement with pure tablegen code in the X86 backend. This is
> useful
> because both the X86-disassembler-specific part of tablegen and the
> assembler
> need this and TD is the natural sharing place.
> 
> The patch also adds the missing documentation for the shift and add
> operator.
> 
> Does this look good?

LGTM. Thanks!

 -Hal

> 
> Thanks,
> Adam
> 
> 
> 
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory