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Re: Creating temporary variables
Ian Lance Taylor wrote:
> VIbhav Garg <vibhtech@yahoo.com> writes:
>
>
>>I am working on some optimizations on the CFG. Can someone please give
>>me some info on the following -
>>
>>1. For an gimple expression node, how do we determine the return type?
>
>
> You can get the type of any gimple expression using TREE_TYPE.
>
>
>>2. How do we create a temporary variable, and add it to the list of
>>variables defined in the current function declaration?
>
>
> create_tmp_var.
I have seen calls to add_referenced_tmp_var after a call to
create_tmp_var. Is this necessary?
>
>
>>3. Any particular code I can look at to see how it works.
>
>
> grep for create_tmp_var.
>
>
>>4. Any issues I should be aware of?
>
>
> It kinds of depends on when during the compilation you are doing this.
> When in SSA form you probably need to do other stuff as well.
I am doing this before SSA form is applied but after CFG is built.
>
> Ian
>