Add exp builtins header to sycl.hpp and c++17 guards.

Signed-off-by: JackAKirk <[email protected]>

Author: JackAKirk

sycl/include/CL/sycl.hpp

@@ -61,6 +61,7 @@
 #include <sycl/ext/oneapi/backend/level_zero.hpp>
 #endif
 #include <sycl/ext/oneapi/device_global/properties.hpp>
+#include <sycl/ext/oneapi/experimental/builtins.hpp>
 #include <sycl/ext/oneapi/experimental/cuda/barrier.hpp>
 #include <sycl/ext/oneapi/filter_selector.hpp>
 #include <sycl/ext/oneapi/group_algorithm.hpp>

sycl/include/sycl/ext/oneapi/experimental/builtins.hpp

@@ -143,8 +143,12 @@ sycl::marray<bfloat16, N> fabs(sycl::marray<bfloat16, N> x) {
     auto partial_res = __clc_fabs(detail::to_uint32_t(x, i * 2));
     std::memcpy(&res[i * 2], &partial_res, sizeof(uint32_t));
   }
-
-  if constexpr (N % 2) {
+#if __cplusplus >= 201703L
+  if constexpr (N % 2)
+#else
+  if (N % 2)
+#endif // __cplusplus >= 201703L
+  {
     res[N - 1] = bfloat16::from_bits(__clc_fabs(x[N - 1].raw()));
   }
   return res;
@@ -179,7 +183,12 @@ sycl::marray<bfloat16, N> fmin(sycl::marray<bfloat16, N> x,
     std::memcpy(&res[i * 2], &partial_res, sizeof(uint32_t));
   }
 
-  if constexpr (N % 2) {
+#if __cplusplus >= 201703L
+  if constexpr (N % 2)
+#else
+  if (N % 2)
+#endif // __cplusplus >= 201703L
+  {
     res[N - 1] =
         bfloat16::from_bits(__clc_fmin(x[N - 1].raw(), y[N - 1].raw()));
   }
@@ -217,7 +226,12 @@ sycl::marray<bfloat16, N> fmax(sycl::marray<bfloat16, N> x,
     std::memcpy(&res[i * 2], &partial_res, sizeof(uint32_t));
   }
 
-  if constexpr (N % 2) {
+#if __cplusplus >= 201703L
+  if constexpr (N % 2)
+#else
+  if (N % 2)
+#endif // __cplusplus >= 201703L
+  {
     res[N - 1] =
         bfloat16::from_bits(__clc_fmax(x[N - 1].raw(), y[N - 1].raw()));
   }
@@ -257,7 +271,12 @@ sycl::marray<bfloat16, N> fma(sycl::marray<bfloat16, N> x,
     std::memcpy(&res[i * 2], &partial_res, sizeof(uint32_t));
   }
 
-  if constexpr (N % 2) {
+#if __cplusplus >= 201703L
+  if constexpr (N % 2)
+#else
+  if (N % 2)
+#endif // __cplusplus >= 201703L
+  {
     res[N - 1] = bfloat16::from_bits(
         __clc_fma(x[N - 1].raw(), y[N - 1].raw(), z[N - 1].raw()));
   }