[SYCL] Support target::host_task specialised accessor constructor using mode_target Tag. (#8735)

- Support target::host_task specialised accessor constructor using
mode_target Tag.
- Add minimal test.

Author: mmoadeli

sycl/include/sycl/accessor.hpp

@@ -399,6 +399,28 @@ constexpr access::mode deduceAccessMode() {
     return access::mode::read;
   }
 
+  if constexpr (std::is_same<
+                    MayBeTag1,
+                    mode_target_tag_t<access::mode::read,
+                                      access::target::host_task>>::value ||
+                std::is_same<
+                    MayBeTag2,
+                    mode_target_tag_t<access::mode::read,
+                                      access::target::host_task>>::value) {
+    return access::mode::read;
+  }
+
+  if constexpr (std::is_same<
+                    MayBeTag1,
+                    mode_target_tag_t<access::mode::write,
+                                      access::target::host_task>>::value ||
+                std::is_same<
+                    MayBeTag2,
+                    mode_target_tag_t<access::mode::write,
+                                      access::target::host_task>>::value) {
+    return access::mode::write;
+  }
+
   return access::mode::read_write;
 }
 
@@ -414,6 +436,28 @@ constexpr access::target deduceAccessTarget(access::target defaultTarget) {
     return access::target::constant_buffer;
   }
 
+  if constexpr (
+      std::is_same<MayBeTag1,
+                   mode_target_tag_t<access::mode::read,
+                                     access::target::host_task>>::value ||
+      std::is_same<MayBeTag2,
+                   mode_target_tag_t<access::mode::read,
+                                     access::target::host_task>>::value ||
+      std::is_same<MayBeTag1,
+                   mode_target_tag_t<access::mode::write,
+                                     access::target::host_task>>::value ||
+      std::is_same<MayBeTag2,
+                   mode_target_tag_t<access::mode::write,
+                                     access::target::host_task>>::value ||
+      std::is_same<MayBeTag1,
+                   mode_target_tag_t<access::mode::read_write,
+                                     access::target::host_task>>::value ||
+      std::is_same<MayBeTag2,
+                   mode_target_tag_t<access::mode::read_write,
+                                     access::target::host_task>>::value) {
+    return access::target::host_task;
+  }
+
   return defaultTarget;
 }
 

sycl/test/basic_tests/accessor/accessor_tag_ctor.cpp

@@ -0,0 +1,19 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -fsyntax-only
+
+#include <sycl/sycl.hpp>
+
+constexpr static int size = 1;
+
+void test_accessor_tag_ctor(sycl::handler &cgh,
+                            sycl::buffer<int, size> &buffer) {
+  auto read_only_dev_acc = sycl::accessor(buffer, cgh, sycl::read_only);
+  auto write_only_dev_acc = sycl::accessor(buffer, cgh, sycl::write_only);
+  auto read_write_dev_acc = sycl::accessor(buffer, cgh, sycl::read_write);
+  auto read_only_host_acc =
+      sycl::accessor(buffer, cgh, sycl::read_only_host_task);
+  auto write_only_host_acc =
+      sycl::accessor(buffer, cgh, sycl::write_only_host_task);
+  auto read_write_host_acc =
+      sycl::accessor(buffer, cgh, sycl::read_write_host_task);
+  auto read_write_const_acc = sycl::accessor(buffer, cgh, sycl::read_constant);
+}