I just need an example to understant the pb. after that I will test with the current IPA CP implementetion Thank you ----- Message d'origine ---- De : Ian Lance Taylor <iant@xxxxxxxxxx> À : charfi asma <charfiasma@xxxxxxxx> Cc : gcc-help@xxxxxxxxxxx Envoyé le : Mer 21 avril 2010, 16 h 54 min 00 s Objet : Re: ipa-cp drawback charfi asma <charfiasma@xxxxxxxx> writes: > I have question concernais the constant propagation drawbacks. > I > red in one of the GCC summit paper that Constant propagation is limited > to create at most one clone of each function body and only in the case: > - the operand is the same constant in all calls to the function > - the operand would not be propagated without cloning because function might be called externally > This makes the interaction with the inliner suboptimal > > Could so explain more this idea? did this means that ipa-cp will produce only one version of a calle function? > Could so please give me an example that shows this drawbak? I think that the implementation of IPA CP has been improved since that paper was written. Ian
