[PATCH] D69979: clang: Guess at some platform FTZ/DAZ default settings

Sun Nov 10 21:53:28 PST 2019

arsenm added a comment.

In D69979#1738723 <https://reviews.llvm.org/D69979#1738723>, @spatel wrote:

> Also, I may have missed some discussions. Does this patch series replace the proposal to add instruction-level FMF for denorms?
>  http://lists.llvm.org/pipermail/llvm-dev/2019-September/135183.html
>
> Ie, did we decide that a function-level attribute is good enough?

I think this is an orthogonal question. I would still find a ftz flag useful even in the presence of this attribute indicating flushing. For AMDGPU it would be useful with a specific instruction context to allow flushing even when the default mode is set to not flush. For example llvm.fmuladd could be emitted with an ftz flag which would select to an instruction that would ordinarily be illegal if denormals are enabled

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