The fix lives in isAllocSiteRemovable in InstCombine. In LLVM's memory model a stack alloca and an unescaped heap allocation are disjoint objects, so the destructor's "is this SSO?" icmp folds to…

Google is pushing to reintroduce bundle alignment mode in LLVM, a feature that brings substantial complexity to the assembler. I asked for a proper RFC on the x86-64 side: Today they posted one

Such horrible behavior by clang: have a function use a CONST label variable, in the same fn, have a ({ }) block with a local label referenced with && => clang completely loses it while have a doesn't…

Henry Jiang from Apple created a PR with pseudo probe fix CSSPGO for MachO incoming? :)