[AMDGPU] Ask subtarget if waitcnt instruction is needed before barrier instruction
Differential Revision: https://reviews.llvm.org/D24985
llvm-svn: 282875
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
index c278cc5..3298a4b 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -540,6 +540,12 @@
/// Return the maximum number of waves per SIMD for kernels using \p VGPRs VGPRs
unsigned getOccupancyWithNumVGPRs(unsigned VGPRs) const;
+
+ /// \returns True if waitcnt instruction is needed before barrier instruction,
+ /// false otherwise.
+ bool needWaitcntBeforeBarrier() const {
+ return true;
+ }
};
} // End namespace llvm