[LLVMdev] A problem creating operands for a new IR instruction to the mailing list

[Olivier Meurant]

If you want an immediate constant value, ConstantInt::get(APInt(32, 5,
false)) will perhaps help you ?

Olivier.

2009/5/5 seventh moon <suigintou_ at hotmail.com>

>  I have a question about inserting instructions into the LLVM IR.  I can
> insert instructions, but my operands do not have the right type, so it fails
> an assertion at runtime.
>
> I am trying to insert an immediate load instructions, as a means of
> claiming a new register.
>
> Here is what I do:
>     Builder.SetInsertPoint(LLVMBB, I);
>
> // The following line looks to me like it would have a chance o! f loading
> either
> // address 5, or else immediate value 5. Unfortunately, it does neither. It
> compiles
> // but crashes at runtime, that the type of the operand is incompatible
>         Instruction *newI=Builder.CreateLoad(5,"");
>
> // I also tested this, just to do a little sanity check. It also compiles
> then
> // crashes, for the obvious reason that the operand is a register, but an
> address
> // or an immediate value is expected.
>         //Instruction *newI=Builder.CreateLoad(I->getOperand(1),""); //
> also wrong
>
> So to say it simply, my question is, "How can I create a new Value*, which
> indicates
> an immediate value, such as immediate value 5?"
>
> Thank you for your assistance,
> Kao Chang
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