[PATCH] D40696: Enable aggressive FMA on T99 and provide AArch64 option for other micro-arch's

[Stefan Teleman via Phabricator via llvm-commits]

steleman added inline comments.


================
Comment at: lib/Target/AArch64/AArch64.td:152
 
+def FeatureAggressiveFMAFloat :
+  SubtargetFeature<"aggressive-fma-float",
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fhahn wrote:
> How likely is it that we aggressive FMA is beneficial for floats or double only? IMO it's probably enough to just have `-aggressive-fma` for now.

Could you please clarify this? I.e. are you referring to quad-precision?

T99 doesn't have quad-precision FMA. Only floats and doubles. Are there any AArch64 micro-arch'es that can do quad-precision FMA?

Or are you asking about SIMD?




Repository:
  rL LLVM

https://reviews.llvm.org/D40696