[LLVMdev] Inlining functions

Nick Lewycky nicholas at mxc.ca
Thu Oct 20 22:43:12 PDT 2011

Will Dietz wrote:
> On Thu, Oct 20, 2011 at 12:48 PM, Gabriel Quadros
> <gquadrossilva at gmail.com>  wrote:
>> Dear LLVMers,
>>      I am trying to use your inline pass, and I would like to know if it is
>> possible to remove a function from the bitcode file once it is inlined.
>> Basically, I try:
>> $>  opt -inline file2.bc>  file2.in.bc
>>      and I see that all the functions have been inlined into the main
>> procedure, inside file2.in.bc. However, the inlined function is still in the
>> bitcode, even though it is unreachable from main. Is there a way to remove
>> this unreachable function from the bitcode file?
>> thank you very much,
>> Gabriel
> Try "-inline -internalize -globaldce", should do the trick.
> The -globaldce by itself is the pass that does what you want (remove
> unreachable functions among other things), but the -internalize marks
> all functions as internal (otherwise they're reachable via their
> exported symbols, and so globaldce cannot remove them).

Just "opt -internalize -inline" should suffice; the inliner will delete 
an internal function if it inlines all callers away.


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