pengfei added inline comments.
================ Comment at: clang/lib/CodeGen/CGExprScalar.cpp:3386 + FMulAdd = Builder.CreateConstrainedFPCall( + CGF.CGM.getIntrinsic(llvm::Intrinsic::experimental_constrained_fmuladd, + Addend->getType()), ---------------- Allen wrote: > Sorry, I'm not familiar with the optimization of the clang front end. > I'd like to ask, is this optimization supposed to assume that all the > backends have instructions like Fmuladd? No, it is a flexible intrinsic, which allows backends to choose their best approach. It can be either interpretered as mul + add or fma. It represents user doesn't care the differece between them. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D72820/new/ https://reviews.llvm.org/D72820 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
