revert nary

src/targets/gpu/device/include/migraphx/gpu/device/nary.hpp

@@ -87,7 +87,7 @@ void nary_broadcast_vec_impl(
 
     const index_int vec_size     = 4;
     const index_int nlocal       = 1024;
-    const index_int nglobal      = 512 * nlocal;
+    const index_int nglobal      = 256 * nlocal;
     const index_int bdim_vec_len = bdim_len / vec_size;
     hip_vec_visit_all<vec_size>(result, barg, args...)(
         [&](auto output, auto binput, auto... inputs) {
@@ -134,7 +134,7 @@ void nary_broadcast_impl(hipStream_t stream, F f, argument result, argument barg
     auto broadcast_idx = create_broadcast_index(bdim_len, bdim_stride);
 
     const index_int nlocal  = 1024;
-    const index_int nglobal = 512 * nlocal;
+    const index_int nglobal = 256 * nlocal;
     index_int nelements     = result.get_shape().elements();
     hip_visit_all(result, barg, args...)([&](auto output, auto binput, auto... inputs) {
         using type = typename decltype(output)::value_type;
@@ -178,7 +178,7 @@ void nary_double_broadcast_vec_impl(
 
     const index_int vec_size     = 4;
     const index_int nlocal       = 1024;
-    const index_int nglobal      = 512 * nlocal;
+    const index_int nglobal      = 256 * nlocal;
     const index_int bdim_vec_len = bdim_len / vec_size;
     hip_vec_visit_all<vec_size>(result, barg1, barg2, args...)(
         [&](auto output, auto binput1, auto binput2, auto... inputs) {
@@ -234,7 +234,7 @@ void nary_double_broadcast_impl(
     auto broadcast_idx = create_broadcast_index(bdim_len, bdim_stride);
 
     const index_int nlocal  = 1024;
-    const index_int nglobal = 512 * nlocal;
+    const index_int nglobal = 256 * nlocal;
     index_int nelements     = result.get_shape().elements();
     hip_visit_all(result, barg1, barg2, args...)(
         [&](auto output, auto binput1, auto binput2, auto... inputs) {