[SYCL] Use new vec/swizzle in preview mode (#18225)

Before this PR it could only be enabled by explicitly defining a macro,
now it's on by default in preview. We plan on keeping the macro to allow
using old implementation until the first minor release after the next
major one.

Author: aelovikov-intel

sycl/include/sycl/detail/type_traits/vec_marray_traits.hpp

@@ -15,11 +15,7 @@
 
 #ifndef __SYCL_USE_LIBSYCL8_VEC_IMPL
 #if defined(__INTEL_PREVIEW_BREAKING_CHANGES)
-// Several specification changes need to be implemented together to keep CTS
-// passing. We'll switch to `0` once they all land.
-// `__SYCL_USE_PLAIN_ARRAY_AS_VEC_STORAGE` needs to be changed to use this
-// `__SYCL_USE_LIBSYCL8_VEC_IMPL` at that time as well.
-#define __SYCL_USE_LIBSYCL8_VEC_IMPL 1
+#define __SYCL_USE_LIBSYCL8_VEC_IMPL 0
 #else
 #define __SYCL_USE_LIBSYCL8_VEC_IMPL 1
 #endif

sycl/include/sycl/vector.hpp

@@ -24,11 +24,7 @@
 
 // See vec::DataType definitions for more details
 #ifndef __SYCL_USE_PLAIN_ARRAY_AS_VEC_STORAGE
-#if defined(__INTEL_PREVIEW_BREAKING_CHANGES)
-#define __SYCL_USE_PLAIN_ARRAY_AS_VEC_STORAGE 1
-#else
-#define __SYCL_USE_PLAIN_ARRAY_AS_VEC_STORAGE 0
-#endif
+#define __SYCL_USE_PLAIN_ARRAY_AS_VEC_STORAGE !__SYCL_USE_LIBSYCL8_VEC_IMPL
 #endif
 
 #if !defined(__HAS_EXT_VECTOR_TYPE__) && defined(__SYCL_DEVICE_ONLY__)

sycl/test/basic_tests/vectors/assign.cpp

@@ -1,5 +1,4 @@
-// TODO: Remove `__SYCL_USE_LIBSYCL8_VEC_IMPL` once it's auto-set.
-// RUN: %clangxx -fsycl -fsyntax-only %s -fpreview-breaking-changes -D__SYCL_USE_LIBSYCL8_VEC_IMPL=0
+// RUN: %clangxx -fsycl -fsyntax-only %s -fpreview-breaking-changes
 // RUN: %clangxx -fsycl -fsyntax-only %s
 
 #include <sycl/sycl.hpp>
@@ -55,11 +54,7 @@ static_assert(                 !std::is_assignable_v<vec<half, 2>, sw_double_2>)
 static_assert(                  std::is_assignable_v<vec<float, 1>, half>);
 static_assert(                  std::is_assignable_v<vec<float, 1>, float>);
 static_assert(                  std::is_assignable_v<vec<float, 1>, double>);
-#if __SYCL_DEVICE_ONLY__
-static_assert(EXCEPT_IN_PREVIEW std::is_assignable_v<vec<float, 1>, vec<half, 1>>);
-#else
 static_assert(EXCEPT_IN_PREVIEW std::is_assignable_v<vec<float, 1>, vec<half, 1>>);
-#endif
 static_assert(                  std::is_assignable_v<vec<float, 1>, vec<float, 1>>);
 static_assert(                  std::is_assignable_v<vec<float, 1>, vec<double, 1>>);
 static_assert(EXCEPT_IN_PREVIEW std::is_assignable_v<vec<float, 1>, sw_half_1>);

sycl/test/basic_tests/vectors/cxx_conversions.cpp

@@ -1,5 +1,4 @@
-// TODO: Remove `__SYCL_USE_LIBSYCL8_VEC_IMPL` once it's auto-set.
-// RUN: %clangxx -fsycl -fsyntax-only %s -fpreview-breaking-changes -D__SYCL_USE_LIBSYCL8_VEC_IMPL=0
+// RUN: %clangxx -fsycl -fsyntax-only %s -fpreview-breaking-changes
 // RUN: %clangxx -fsycl -fsyntax-only %s
 
 #include <sycl/sycl.hpp>