[PATCH] D27028: Add intrinsics for constrained floating point operations

[Andy Kaylor via llvm-commits]

andrew.w.kaylor added a comment.

In https://reviews.llvm.org/D27028#604603, @hfinkel wrote:

> In https://reviews.llvm.org/D27028#604594, @arsenm wrote:
>
> > As I mentioned at the meeting I think these need a way to control whether denormals are flushed or not
>
>
> You mean that there should be a way to control this on a per-operation basis, or there should be some way to represent that the user might be changing some thread state that controls how this is done?


I was going to ask that same question.

For the purposes of these intrinsics, we only need enough information to control how optimization passes will handle these instructions.  I suppose a transformation like constant folding could theoretically have something to flush to zero.  Does it make sense to treat that as a set of new rounding mode, like LLVM_ROUND_TONEAREST_FTZ, etc.?


Repository:
  rL LLVM

https://reviews.llvm.org/D27028