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...se? Even if this worked correctly as it is now, I don't believe there is any way to truly specify the fence per address space so that other memory accesses to non-fenced ones could move across it. Thanks for any help -------------- next part -------------- ; ModuleID = '/home/marsenau/before_gvn.ll' target datalayout = "e-p:32:32:32" ; Function Attrs: noduplicate nounwind declare void @__amdil_barrier_local() #0 ; Function Attrs: nounwind readnone declare <4 x i32> @__amdil_get_local_id_int() #1 ; Function Attrs: nounwind define void @__OpenCL_execFFT_reduced_kernel(...