[llvm] [X86][Codegen] - Introduce a new tuning for X86 backend to control FMA generation (PR #210343)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

We already have enableAggressiveFMAFusion and isFMAFasterThanFMulAndFAdd tuning hooks, please don't try to add another.

https://github.com/llvm/llvm-project/pull/210343