[ESIMD] Added regression test for postfix simd_view::operator-- (#281)

Author: DenisBakhvalov

SYCL/ESIMD/regression/operator_decrement.cpp

@@ -0,0 +1,88 @@
+//==------------- operator_decrement.cpp  - DPC++ ESIMD on-device test -----==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// This is a test for a bug found simd_view::operator--
+//
+// REQUIRES: gpu
+// UNSUPPORTED: cuda
+// RUN: %clangxx -fsycl -I%S/.. %s -o %t.out
+// RUN: %GPU_RUN_PLACEHOLDER %t.out
+
+#include "esimd_test_utils.hpp"
+
+#include <CL/sycl.hpp>
+#include <CL/sycl/INTEL/esimd.hpp>
+#include <iostream>
+
+using namespace cl::sycl;
+
+int main(void) {
+  constexpr unsigned Size = 1024;
+  constexpr unsigned VL = 16;
+
+  float *A = new float[Size];
+
+  for (unsigned i = 0; i < Size; ++i) {
+    A[i] = i + 1;
+  }
+
+  try {
+    buffer<float, 1> bufa(A, range<1>(Size));
+
+    // We need that many workgroups
+    cl::sycl::range<1> GlobalRange{Size / VL};
+
+    // We need that many threads in each group
+    cl::sycl::range<1> LocalRange{1};
+
+    queue q(esimd_test::ESIMDSelector{}, esimd_test::createExceptionHandler());
+
+    auto dev = q.get_device();
+    std::cout << "Running on " << dev.get_info<info::device::name>() << "\n";
+
+    auto e = q.submit([&](handler &cgh) {
+      auto PA = bufa.get_access<access::mode::read_write>(cgh);
+      cgh.parallel_for<class Test>(
+          GlobalRange * LocalRange, [=](id<1> i) SYCL_ESIMD_KERNEL {
+            using namespace sycl::ext::intel::experimental::esimd;
+            unsigned int offset = i * VL * sizeof(float);
+            simd<float, VL> va;
+            va.copy_from(PA, offset);
+            auto va_view = va.select<VL, 1>(0);
+            va_view--;
+            va.copy_to(PA, offset);
+          });
+    });
+    e.wait();
+  } catch (cl::sycl::exception const &e) {
+    std::cout << "SYCL exception caught: " << e.what() << '\n';
+
+    delete[] A;
+    return e.get_cl_code();
+  }
+
+  int err_cnt = 0;
+
+  for (unsigned i = 0; i < Size; ++i) {
+    if (A[i] != i) {
+      if (++err_cnt < 10) {
+        std::cout << "failed at index " << i << ", " << A[i] << " != " << i
+                  << "\n";
+      }
+    }
+  }
+  if (err_cnt > 0) {
+    std::cout << "  pass rate: "
+              << ((float)(Size - err_cnt) / (float)Size) * 100.0f << "% ("
+              << (Size - err_cnt) << "/" << Size << ")\n";
+  }
+
+  delete[] A;
+
+  std::cout << (err_cnt > 0 ? "FAILED\n" : "Passed\n");
+  return err_cnt > 0 ? 1 : 0;
+}