Add tupleVisitor for from_gpu (#1465)

Need this for when we debug and use MIGRAPHX_TRACE_EVAL() to show tuples
Without this we break when reading our buffer due to the use of visit()
This came up as part of #1283 debugging.

src/targets/gpu/hip.cpp

@@ -196,12 +196,21 @@ argument to_gpu(const argument& arg, bool host)
 argument from_gpu(const argument& arg)
 {
     argument result;
-    arg.visit([&](auto x) {
+    arg.visit(
+        [&](auto x) {
             using type = typename decltype(x)::value_type;
             auto v     = read_from_gpu<type>(arg.data(), x.get_shape().bytes() / sizeof(type));
             // cppcheck-suppress returnDanglingLifetime
             result = {x.get_shape(), [v]() mutable { return v.data(); }};
+        },
+        [&](const auto& xs) {
+            std::vector<argument> args;
+            std::transform(xs.begin(), xs.end(), std::back_inserter(args), [&](auto x) {
+                return from_gpu(x);
             });
+            result = argument{args};
+        });
+
     return result;
 }
 

test/gpu/hip.cpp

+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015-2022 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <test.hpp>
+#include <migraphx/argument.hpp>
+#include <migraphx/gpu/hip.hpp>
+#include <migraphx/gpu/target.hpp>
+
+TEST_CASE(tuple_to_from_gpu)
+{
+    migraphx::shape s1{migraphx::shape::float_type, {2, 3}};
+    migraphx::shape s2{migraphx::shape::int32_type, {2, 4}};
+    std::vector<float> p1_data = {1.1, 2.2, 3.3, 4.4, 5.5, 6.6};
+    std::vector<int> p2_data   = {1, 2, 3, 4, 5, 6, 7, 8};
+    auto p1                    = migraphx::argument{s1, p1_data.data()};
+    auto p2                    = migraphx::argument{s2, p2_data.data()};
+    auto p1_gpu                = migraphx::gpu::to_gpu(p1);
+    auto p2_gpu                = migraphx::gpu::to_gpu(p2);
+    auto p_tuple               = migraphx::gpu::from_gpu(migraphx::argument({p1_gpu, p2_gpu}));
+    std::vector<migraphx::argument> results = p_tuple.get_sub_objects();
+    std::vector<float> result1;
+    results[0].visit([&](auto output) { result1.assign(output.begin(), output.end()); });
+    std::vector<int> result2;
+    results[1].visit([&](auto output) { result2.assign(output.begin(), output.end()); });
+    EXPECT(result1 == p1_data);
+    EXPECT(result2 == p2_data);
+}
+
+int main(int argc, const char* argv[]) { test::run(argc, argv); }