[LLVMdev] Question about llvm.ctpop.*

[Shuxin Yang]

Hi,

    Following is excerpted from 
http://llvm.org/releases/3.1/docs/LangRef.html#int_ctpop.
How come the return type needs to be consistent with parameter type?  
i64/i128 seems to be overkill,
and i8, i16 are inconvenient.

-----------------------------------
   declare i8 @llvm.ctpop.i8(i8  <src>)
   declare i16 @llvm.ctpop.i16(i16 <src>)
   declare i32 @llvm.ctpop.i32(i32 <src>)
   declare i64 @llvm.ctpop.i64(i64 <src>)
   declare i256 @llvm.ctpop.i256(i256 <src>)
   declare <2 x i32> @llvm.ctpop.v2i32(<2 x i32> <src>)
-----------------------------------------------

Thanks
Shuxin