Add a few explicit tests on pitches

test/unit/mem/buf/src/PitchTest.cpp

@@ -0,0 +1,75 @@
+/* Copyright 2022 Bernhard Manfred Gruber
+ *
+ * This file is part of alpaka.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <alpaka/mem/buf/Traits.hpp>
+#include <alpaka/test/acc/TestAccs.hpp>
+
+#include <boost/mp11.hpp>
+#include <catch2/catch_message.hpp>
+#include <catch2/catch_test_macros.hpp>
+
+namespace
+{
+    using Idx = int;
+
+    template<typename Dev, typename Dim>
+    void checkBufferPitches(const Dev& dev, alpaka::Vec<Dim, Idx> extent, alpaka::Vec<Dim, Idx> expectedPitches)
+    {
+        auto buf = alpaka::allocBuf<float, Idx>(dev, extent);
+        CAPTURE(extent);
+        const auto pitches = alpaka::getPitchBytesVec(buf);
+        CHECK(pitches == expectedPitches);
+        boost::mp11::mp_for_each<boost::mp11::mp_iota<Dim>>(
+            [&](auto ic)
+            {
+                constexpr auto i = decltype(ic)::value;
+                CHECK(alpaka::getPitchBytes<i>(buf) == pitches[i]);
+            });
+    }
+} // namespace
+
+#ifdef ALPAKA_ACC_CPU_B_SEQ_T_SEQ_ENABLED
+TEST_CASE("memBufPitchTest.AccCpuSerial", "[memBuf]")
+{
+    using Acc = alpaka::AccCpuSerial<alpaka::DimInt<0>, Idx>;
+    const auto dev = alpaka::getDevByIdx<alpaka::Pltf<alpaka::Dev<Acc>>>(0);
+
+    checkBufferPitches(dev, alpaka::Vec<alpaka::DimInt<0>, Idx>{}, alpaka::Vec<alpaka::DimInt<0>, Idx>{});
+
+    checkBufferPitches(dev, alpaka::Vec{10}, alpaka::Vec{40});
+
+    checkBufferPitches(dev, alpaka::Vec{42, 10}, alpaka::Vec{1680, 40});
+    checkBufferPitches(dev, alpaka::Vec{10, 42}, alpaka::Vec{1680, 168});
+
+    checkBufferPitches(dev, alpaka::Vec{42, 10, 2}, alpaka::Vec{3360, 80, 8});
+    checkBufferPitches(dev, alpaka::Vec{2, 10, 42}, alpaka::Vec{3360, 1680, 168});
+}
+#endif
+
+#ifdef ALPAKA_ACC_GPU_CUDA_ENABLED
+TEST_CASE("memBufPitchTest.AccGpuCudaRt", "[memBuf]")
+{
+    using Idx = int;
+    using Acc = alpaka::AccGpuCudaRt<alpaka::DimInt<0>, Idx>;
+
+    const auto dev = alpaka::getDevByIdx<alpaka::Pltf<alpaka::Dev<Acc>>>(0);
+
+    checkBufferPitches(dev, alpaka::Vec<alpaka::DimInt<0>, Idx>{}, alpaka::Vec<alpaka::DimInt<0>, Idx>{});
+
+    checkBufferPitches(dev, alpaka::Vec{10}, alpaka::Vec{40});
+
+    constexpr auto pitch = 512;
+
+    checkBufferPitches(dev, alpaka::Vec{42, 10}, alpaka::Vec{42 * pitch, pitch});
+    checkBufferPitches(dev, alpaka::Vec{10, 42}, alpaka::Vec{10 * pitch, pitch});
+
+    checkBufferPitches(dev, alpaka::Vec{42, 10, 2}, alpaka::Vec{42 * 10 * pitch, 10 * pitch, pitch});
+    checkBufferPitches(dev, alpaka::Vec{2, 10, 42}, alpaka::Vec{2 * 10 * pitch, 10 * pitch, pitch});
+}
+#endif