[AMDGPU][Waitcnt] Fix handling of flat instrs

On GFX9 and earlier, flat memory ops may decrement VMCNT out-of-order as well as LGKMCNT out-of-order.

Differential Revision: https://reviews.llvm.org/D46616

llvm-svn: 333926

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
index 136e65afa4e..b4b0873eaf3 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -472,6 +472,10 @@ public:
     return FlatScratchInsts;
   }
 
+  bool hasFlatLgkmVMemCountInOrder() const {
+    return getGeneration() > GFX9;
+  }
+
   bool hasD16LoadStore() const {
     return getGeneration() >= GFX9;
   }