[PATCH] D17141: [ARM] Adding IEEE-754 SIMD detection to loop vectorizer

[Renato Golin via llvm-commits]

rengolin added a comment.

In http://reviews.llvm.org/D17141#351589, @resistor wrote:

> That's not correct for all platforms.  Darwin, for example, uses NEON for floating point even in non-fast-math mode.  The platform is simply defined not to support subnormals.


Well, NEON denormal behaviour is independent of the OS running underneath, so this is the correct information. But it may not be the best decision for Darwin, and that's a separate story.

Can you always add a fast-math flag on Darwin builds in the front-end? Or maybe have another CC1 option to control SIMD use?

I don't think adding isDarwin() to the TTI makes any sense.

cheers,
--renato


Repository:
  rL LLVM

http://reviews.llvm.org/D17141