arsenm added inline comments.
================
Comment at: lib/Basic/Targets.cpp:2208-2210
+ TargetOpts.Features.push_back(
+ (Twine(hasFullSpeedFMAF32(TargetOpts.CPU) &&
+ !CGOpts.FlushDenorm ? '+' : '-') + Twine("fast-fmaf")).str());
----------------
We glue fast-fmaf to the specific subtargets, so I don't think you can actually
turn it and off. It has this nonsensical behavior where it assumes if you
disable a subtarget feature for the processors you aren't actually targeting
the processor at all. I think a dedicated new feature might be needed
https://reviews.llvm.org/D32084
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