[PATCH] D61675: [WIP] Update IRBuilder::CreateFNeg(...) to return a UnaryOperator

[Cameron McInally via Phabricator via llvm-commits]

cameron.mcinally added a comment.

In D61675#1671688 <https://reviews.llvm.org/D61675#1671688>, @cameron.mcinally wrote:

> Someone could argue, though, to just use a constrained strict FSub if you care about DAZ/FTZ. That seems like a valid solution. But, that is really treating DAZ/FTZ like a rounding-mode, not underflow. It would be a heavy hammer to enforce all the side-effect concerns when the user really only cares about DAZ/FTZ. In other words, we'll be losing significant performance in an attempt to gain significant performance.


Now that I've said that, I suppose someone could argue that DAZ/FTZ *is* a side-effect. :D


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