https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108351
Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |yinyuefengyi at gmail dot com --- Comment #3 from Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi at gmail dot com> --- (In reply to Andrew Pinski from comment #2) > I noticed that with the C++ front-end early inline inlines f into main but > with the C front-end it does not ... C++ generates different call instructions with C front-end: < D.3747 = f (7, 7); < D.3748 = f (9, 7); --- > f (7, 7); > f (9, 7); then an extra return_cost cost is added to C++ front-end: < D.3747 = f (7, 7); < freq:1.00 size: 4 time: 13 < D.3748 = f (9, 7); < freq:1.00 size: 4 time: 13 --- > f (7, 7); > freq:1.00 size: 3 time: 12 > f (9, 7); > freq:1.00 size: 3 time: 12 early inline pass inlines the two calls with C front-end but fails to inline them with C++ front-end due to "growth 8 exceeds --param early-inlining-insns divided by number of calls". gcc/ipa-inline.cc:747 growth * (n + 1) > early_inlining_insns gcc/opts.cc:687 { OPT_LEVELS_3_PLUS, OPT__param_early_inlining_insns_, NULL, 14 }, Tried revert the commit r13-4240-gfeeb0d68f1c708, the two calls still exits, need also revert the commit r13-4686-g095a13eda2caf6. (r13-4686 mentioned IPA-SRA detects whether parameters could be removed, obviously it doesn't work well now if constants are not propagated before IPA-SRA, it seems that the IPA-SRA only remove locally_unused parameters but 'm' is not locally used and the constants from caller are not visible in IPA-SRA?)