llvm dev - Aug 2017 - Legalize sdiv Instruction for vector integer

Hello,

I want to write a new instruction for vector division. one for integer
other instruction for float.
I came to know llvm ir uses sdiv and fdiv for these operations respectively.

i was able to write the instruction for float/ double div without
explicitly declaring fdiv legal for vector v64f32 in isellowering.cpp file.
but when i used the same approach for int and long i was getting some
error. so for that i had to explicitly declare sdiv legal in
isellowering.cpp file as follows.

 setOperationAction(ISD::SDIV,                MVT::v64i32, Legal);

Why is that so? Please explain.

Thank You
Regards
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