[PATCH] D25998: AMDGPU/SI: Don't use non-0 waitcnt values when waiting on Flat instructions

[Matt Arsenault via llvm-commits]

arsenm added inline comments.


================
Comment at: lib/Target/AMDGPU/SIInsertWaits.cpp:300-301
 
+  if (TII->isFLAT(*I))
+    IsFlatOutstanding = true;
+
----------------
Is this too strict? I know the manual says something like the only sensible value to use is 0 ,but from the reasoning before it it sounds like that's only if accessing a generic address. We could check the MMO and see if it is really global which is the common case


https://reviews.llvm.org/D25998