[PATCH] D11605: [LoopUnswitch] Add block frequency analysis to recognize hot/cold regions

[Chen Li via llvm-commits]

chenli added inline comments.

================
Comment at: lib/Transforms/Scalar/LoopUnswitch.cpp:441
@@ +440,3 @@
+
+  if (LoopUnswitchWithBlockFrequency) {
+    BranchProbabilityInfo BPI(*F, *LI);
----------------
davidxl wrote:
> Note that this also triggers the check when PGO is not enabled (e.g, with static prediction).
> 
> To check if PGO is on, do:
> 
>   HasProfileData = F.getEntryCount().hasValue();
>   if (HasProfileData) {
> 
> ..
Do you mean that without PGO enabled, this should never be triggered?


http://reviews.llvm.org/D11605