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

[James Molloy]

Hi,

If x is a local variable, it will be stored on the stack. So you need an
alloca for it:

%x = alloca i8    ; <i8*>

Then you can just perform a store:

Store i8* %x, i8 0

Cheers,

James

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
> On Behalf Of leledumbo
> Sent: 20 October 2010 14:39
> To: llvmdev at cs.uiuc.edu
> Subject: Re: [LLVMdev] Re : How to assign a constant to a register?
> 
> 
> > 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?
> 
> Yes, the representation is an AST. It's not in SSA yet, as it's a
> direct
> representation of the input. I'm confused for this node:
>   :=
>  /  \
> x    0
> 
> where x is a local variable.
> 
> > 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.
> 
> I'll consider it, it would useful for constant expression.
> 
> --
> View this message in context: http://old.nabble.com/How-to-assign-a-
> constant-to-a-register--tp29987387p30009972.html
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> 
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