[SYCL] Refactor and generate SYCL builtins (intel#10198)

This commit changes the builtin headers from defining all SYCL builtins
to using a number of generated header files containing these builtin
functions.

---------

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

sycl/CMakeLists.txt

@@ -179,9 +179,31 @@ set(sycl_plugin_dir ${CMAKE_CURRENT_SOURCE_DIR}/plugins)
 string(TIMESTAMP __SYCL_COMPILER_VERSION "%Y%m%d")
 configure_file("source/version.hpp.in" "${SYCL_INCLUDE_BUILD_DIR}/sycl/version.hpp")
 configure_file("source/feature_test.hpp.in" "${SYCL_INCLUDE_BUILD_DIR}/sycl/feature_test.hpp")
+
+# Generate SYCL builtins
+find_package(Python3 REQUIRED)
+add_custom_command(
+  COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/source/builtins_generator.py ${SYCL_INCLUDE_BUILD_DIR}/sycl
+  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/source/builtins_generator.py
+  OUTPUT "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_scalar_gen.hpp"
+         "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_vector_gen.hpp"
+         "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_marray_gen.hpp"
+  COMMENT "Generating SYCL builtin headers"
+)
+
+add_custom_target(sycl-builtins-header
+  DEPENDS "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_scalar_gen.hpp"
+          "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_vector_gen.hpp"
+          "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_marray_gen.hpp"
+)
+
+# Install generated headers.
 install(FILES
   "${SYCL_INCLUDE_BUILD_DIR}/sycl/feature_test.hpp"
   "${SYCL_INCLUDE_BUILD_DIR}/sycl/version.hpp"
+  "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_scalar_gen.hpp"
+  "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_vector_gen.hpp"
+  "${SYCL_INCLUDE_BUILD_DIR}/sycl/builtins_marray_gen.hpp"
   DESTINATION "${SYCL_INCLUDE_DIR}/sycl"
   COMPONENT sycl-headers)
 
@@ -210,6 +232,7 @@ add_custom_target(sycl-headers
           ${OUT_HEADERS_IN_CL_DIR}
           ${OUT_HEADERS_IN_STD_DIR}
           ${OUT_HEADERS_IN_SYCLCOMPAT_DIR}
+          sycl-builtins-header
           boost_mp11-headers)
 
 add_custom_command(