llvm dev - Apr 2013 - [LLVMdev] get the identifies of the unnamed temporaries from the instruction of LLVM IR

hello guys:
I am in trouble with get the identifies of the unnamed temporaries from the
instruction of LLVM IR.
for example:
instruction: %4 = mul nsw i32 %1, %width
unnamed temporaries: %4, %1
how to get them?
I have tried several iterators(op_iterator,value_op_iterator) and
getOperand(int) function,but none of them works.
does anyone know how to get it? thanks very much



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Hi,

On 09/04/13 10:16, Dong Chen wrote:
> hello guys:
> I am in trouble with get the identifies of the unnamed temporaries from the
> instruction of LLVM IR.
this is a FAQ.  Most names in the IR are just there to make it easier to read
and can safely be removed.  You can't rely on instructions having names, and
as
you saw often they do not have a name.  Even if they start off with a name, the
optimizers may change the name, eg when inlining.
> for example:
> instruction: %4 = mul nsw i32 %1, %width
> unnamed temporaries: %4, %1
These are not temporaries, they are values without a name.  The numbers %4 and
%1 only exist in the human readable IR (.ll file), as without them it
wouldn't
be possible to convert the human readable IR back into bitcode.  You can't
get
hold of them from the API since they don't exist.
> how to get them?
> I have tried several iterators(op_iterator,value_op_iterator) and
> getOperand(int) function,but none of them works.
> does anyone know how to get it? thanks very much
Why do you want them?  Maybe you are really looking for debug info?

Ciao, Duncan.
>
>
>
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hi, Duncan Sands:
thanks for your reply old friend.
the reason why I want to get the unnamed value is that I am doing some
analysis based on the IR code. And IR is in the form of SSA(static single
assignment). so i need to get the operands of each instructions including a
lot of instructions like this (%4 = mul nsw i32 %1, %width). 
the unnamed values are the connection of instructions, if i can't get that,
how can i know the dependency of the instructions?



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