[llvm-dev] Moving instructions from source Basic Block to dest Basic Block

[Jajoo, Malhar via llvm-dev]

Hi,


I have been trying to move some instructions between basic blocks ,


After looking at the API , I found llvm::Instruction::clone()  but there

is no result value for this.



For example-


source Basic block :


continuation:                                     ; preds = %else, %then
  %iftmp = phi i32 [ 5, %then ], [ 9, %else ]
  store i32 %iftmp, i32* %datasize

 ; 3 instructions below being copied
  store i8000000 0, i8000000* %res
  %res4 = load i8000000, i8000000* %res
  ret i8000000 %res4


After copying the 3 instructions above to destination basic block.

destination basic block :


else:                                             ; preds = %entry
  store i8000000 0, i8000000* %res
  %1---->issue = load i8000000, i8000000* %res
  ret i8000000 %res4 -----> issue , need to get result of instruction above.
  br label %continuation





I had tried using a simple Instruction::insert() earlier but ran

into an assertion error complaining that the Function contained duplicated instruction.


My Question : How to copy an instruction ( along with it's name , or the LHS of the instruction )

Is it possible to do name the LHS of the instruction using clone()  ?


Thanks,

Malhar

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