[LLVMdev] [LLVMDev] [Question] The TargetRegisterClass has a confusing method.

Bill Wendling wendling at apple.com
Tue Aug 31 13:29:50 PDT 2010

On Aug 31, 2010, at 12:26 PM, Jeff Kunkel wrote:

> The method below takes in a register and returns a register. To me this makes no sense because
> when I already have a register, why would I need to get it? Could someone please explain the
> transformation that is happening here?
>   /// getRegister - Return the specified register in the class.
>   ///
>   unsigned getRegister(unsigned i) const {
>     assert(i < getNumRegs() && "Register number out of range!");
>     return RegsBegin[i];
>   }
The "i" in here isn't the register but an index into the RegsBegin array.


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