llvm dev - Aug 2018 - Create an Add Instruction in LLVM IR

I want to create an add instruction that takes two constant operands at the
LLVM IR level. I use the IRBuilder class, but nothing happens. Here is part
of the runOnFunction() method of my function pass:
...
LLVMContext &Context = F.getContext();
IRBuilder<> builder(&Instruction);
Value *Lef = ConstantInt::get(Type::getInt32Ty(Context), 4);
Value *Rig = ConstantInt::get(Type::getInt32Ty(Context), 5);
Value *Result = builder.CreateAdd(Lef, Rig);
...
It seems that the problem is with the ConstantInt::get() function. Any idea?
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By default IRBuilder uses ConstantFolder to fold your constant add instruction.
In order to disable this, use IRBuilder<NoFolder>

Zhang
> 在 2018年8月7日，10:16，Ahmad Nouralizadeh via llvm-dev <llvm-dev at
lists.llvm.org> 写道：
> 
> I want to create an add instruction that takes two constant operands at the
LLVM IR level. I use the IRBuilder class, but nothing happens. Here is part of
the runOnFunction() method of my function pass:
> ...
> LLVMContext &Context = F.getContext();
> IRBuilder<> builder(&Instruction);
> Value *Lef = ConstantInt::get(Type::getInt32Ty(Context), 4);
> Value *Rig = ConstantInt::get(Type::getInt32Ty(Context), 5);
> Value *Result = builder.CreateAdd(Lef, Rig);
> ...
> It seems that the problem is with the ConstantInt::get() function. Any
idea?
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Thanks! It worked!

On Tue, Aug 7, 2018 at 7:35 AM, mayuyu.io <admin at mayuyu.io> wrote:
> By default IRBuilder uses ConstantFolder to fold your constant add
> instruction. In order to disable this, use IRBuilder<NoFolder>
>
> Zhang
>
> > 在 2018年8月7日，10:16，Ahmad Nouralizadeh via llvm-dev <
> llvm-dev at lists.llvm.org> 写道：
> >
> > I want to create an add instruction that takes two constant operands
at
> the LLVM IR level. I use the IRBuilder class, but nothing happens. Here is
> part of the runOnFunction() method of my function pass:
> > ...
> > LLVMContext &Context = F.getContext();
> > IRBuilder<> builder(&Instruction);
> > Value *Lef = ConstantInt::get(Type::getInt32Ty(Context), 4);
> > Value *Rig = ConstantInt::get(Type::getInt32Ty(Context), 5);
> > Value *Result = builder.CreateAdd(Lef, Rig);
> > ...
> > It seems that the problem is with the ConstantInt::get() function. Any
> idea?
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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