[LLVMdev] Operand, instruction
krishnadhan at cse.iitb.ac.in
Thu Apr 22 06:37:57 PDT 2010
Hello, how to get the numerical value of an constant operand? For ex. %tmp =
mul i32 %indvar, 6 , in this instruction second operand is a numerical
constant with value 6. But i am only able to print it by using
getOperand(1), not able to store it in any integer variable. Using getName()
returns a empty string. Is there any way to solve this problem?
John Criswell-2 wrote:
> help__me_please wrote:
>> Can you please give an example of creating an instruction (for example
>> instructions with two operand a and b)? I am trying instruction() for a
>> while, but no success yet.
> You need to look for the appropriate subclass of llvm::Instruction and
> find the method for creating a new instruction. The method is usually a
> static method and takes arguments pointing to the values to use as
> operands. Doxygen is your best resource for finding these methods.
> For example, if you look at
> http://llvm.org/doxygen/classllvm_1_1AllocaInst.html, you can see that
> the AllocaInst class (which represents an alloca instruction) has a
> standard constructor method that takes the type of object to allocate,
> the name of the new alloca instruction, an instruction before which to
> insert the alloca instruction, etc.
> As another example, the CallInst class
> (http://llvm.org/doxygen/classllvm_1_1CallInst.html) represents a call
> instruction and has a static Create() method that you can use to create
> a new call instruction.
> -- John T.
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
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