[LLVMdev] jump to function
Dale Johannesen
dalej at apple.com
Wed May 20 14:34:09 PDT 2009
On May 20, 2009, at 2:22 PMPDT, dan mihai wrote:
> Hello,
>
> Is it possible to jump from one function to the beginning of another
> function?
This can't be represented in llvm IR (or in standard C/C++). An
optimization called (in LLVM) "tail call" will generate this at the
assembly level, but not all back ends have this implemented.
> For instance, assume wrapper_FOO is a wrapper for FOO. I replace the
> code
> ..............................
> bar() {
> FOO(...)
> }
> ..............................
> with
> ..............................
> bar() {
> wrapper_FOO(...)
> }
> ..............................
>
> Now, for efficiency, I'd like to have
> wrapper_FOO() {
> <do some work>
> jump FOO;
> }
>
> Thank you,
> Dan
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