[NFC][ESIMD] Simplify simd_view template specialization for len=1 (#4334)

Author: DenisBakhvalov

sycl/include/sycl/ext/intel/experimental/esimd/detail/region.hpp

@@ -57,8 +57,7 @@ template <typename T, int SizeY, int StrideY, int SizeX, int StrideX>
 using region2d_t = region_base<true, T, SizeY, StrideY, SizeX, StrideX>;
 
 // A region with a single element.
-template <bool Is2D, typename T, int StrideY, int StrideX>
-using region_base_1 = region_base<Is2D, T, 1, StrideY, 1, StrideX>;
+template <typename T> using region_base_1 = region_base<false, T, 1, 0, 1, 0>;
 
 // simd_view forward declaration.
 template <typename BaseTy, typename RegionTy> class simd_view;

sycl/include/sycl/ext/intel/experimental/esimd/simd_view.hpp

@@ -101,14 +101,14 @@ class simd_view : public detail::simd_view_impl<BaseTy, RegionTy> {
 ///   bool b = v[0] > v[1] && v[2] < 42;
 ///
 /// \ingroup sycl_esimd
-template <typename BaseTy, bool Is2D, typename T, int StrideY, int StrideX>
-class simd_view<BaseTy, region_base_1<Is2D, T, StrideY, StrideX>>
-    : public detail::simd_view_impl<BaseTy,
-                                    region_base_1<Is2D, T, StrideY, StrideX>> {
+template <typename BaseTy>
+class simd_view<BaseTy, region_base_1<typename BaseTy::element_type>>
+    : public detail::simd_view_impl<
+          BaseTy, region_base_1<typename BaseTy::element_type>> {
   template <typename, int> friend class simd;
 
 public:
-  using RegionTy = region_base_1<Is2D, T, StrideY, StrideX>;
+  using RegionTy = region_base_1<typename BaseTy::element_type>;
   using BaseClass = detail::simd_view_impl<BaseTy, RegionTy>;
   using ShapeTy = typename shape_type<RegionTy>::type;
   static constexpr int length = ShapeTy::Size_x * ShapeTy::Size_y;

sycl/test/esimd/esimd-util-compiler-eval.cpp

@@ -19,7 +19,7 @@ static_assert(log2<1024 * 1024>() == 20, "");
 
 using BaseTy = simd<float, 4>;
 using RegionTy = region1d_t<float, 2, 1>;
-using RegionTy1 = region_base_1<false, float, 1, 1>;
+using RegionTy1 = region_base_1<float>;
 static_assert(is_simd_view_v<simd_view_impl<BaseTy, RegionTy>>::value, "");
 static_assert(is_simd_view_v<simd_view<BaseTy, RegionTy>>::value, "");
 static_assert(is_simd_view_v<simd_view<BaseTy, RegionTy1>>::value, "");