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Hi, I am trying to test ThinLTO mode with lld, but am seeing failures because (at optimisation levels above -O0), clang inserts calls to clang.arc.use, which are expected to be removed by the ObjCARCCompact pass. Unfortunately, this pass doesn’t seem to be being run by lld (and adding -mllvm -print-after-all indicates that only SimplifyCFG is being run, which is a bit surprising, though the

Hi Teresa, Impressive results, indeed! (But no less is expected from an Itanium alumni... ;-)) One question, if you don't mind. In the blog post you wrote: "In a few cases ThinLTO even outperforms full LTO, most likely because the higher scalability of ThinLTO allows using a more aggressive backend optimization pipeline (similar to that of a non-LTO build)." Is it due to