[LLVMdev] Re : How to assign a constant to a register?

[Matthieu Wipliez]

leledumbo,

from what you say, I assume you have some kind of representation (AST or a 
lower-level intermediate representation) from which you generate LLVM assembly.
Is this representation in SSA form?
If it is, you might want to do a "copy propagation" transformation that replaces 
the uses of all variables that are assigned a constant value by their 
definitions.
Example:

x = 5
y = x + 1
z = x * y

becomes

y = 5 + 1
z = 5 * y

Cheers
Matthieu



----- Message d'origine ----
> De : Duncan Sands <baldrick at free.fr>
> À : llvmdev at cs.uiuc.edu
> Envoyé le : Mer 20 octobre 2010, 11h 59min 32s
> Objet : Re: [LLVMdev] How to assign a constant to a register?
> 
> On 20/10/10 11:37, leledumbo wrote:
> >
> >> Why not just use  ConstantInt::get() when you want the number 5?
> >
> > Because I'm not  using LLVM libraries, I'm generating LLVM assembly myself.
> 
> In that case,  why not output '5' when you want  5?
> 
> Ciao,
> 
> Duncan.
> _______________________________________________
> LLVM  Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>