[SYCL-PTX] Enable 16 bits float builtins. (#2024)

This patch enables 16 bits float in the libclc.
It also provides a bindings between __fp16 (with native halfs) and _Float16,
it is safe as in libclc the configuration both lower to the same type.

Signed-off-by: Victor Lomuller <[email protected]>

Author: Naghasan

libclc/generic/include/as_type.h

@@ -85,4 +85,13 @@
 #define as_half16(x) __builtin_astype(x, half16)
 #endif
 
+#ifdef __CLC_HAS_FLOAT16
+#define as_float16_t(x) __builtin_astype(x, __clc_float16_t)
+#define as_vec2_float16_t(x) __builtin_astype(x, __clc_vec2_float16_t)
+#define as_vec3_float16_t(x) __builtin_astype(x, __clc_vec3_float16_t)
+#define as_vec4_float16_t(x) __builtin_astype(x, __clc_vec4_float16_t)
+#define as_vec8_float16_t(x) __builtin_astype(x, __clc_vec8_float16_t)
+#define as_vec16_float16_t(x) __builtin_astype(x, __clc_vec16_float16_t)
+#endif
+
 #endif // CLC_AS_TYPE

libclc/generic/include/lp64_types.h

@@ -9,6 +9,10 @@
 #ifndef CLC_LP64_TYPES
 #define CLC_LP64_TYPES
 
+#ifdef __FLT16_MAX__
+#define __CLC_HAS_FLOAT16
+#endif
+
 typedef bool __clc_bool_t;
 
 typedef char __clc_char_t;
@@ -106,6 +110,16 @@ typedef half __clc_vec16_fp16_t __attribute__((ext_vector_type(16)));
 
 #endif
 
+#ifdef __CLC_HAS_FLOAT16
+
+typedef _Float16 __clc_float16_t;
+typedef _Float16 __clc_vec2_float16_t __attribute__((ext_vector_type(2)));
+typedef _Float16 __clc_vec3_float16_t __attribute__((ext_vector_type(3)));
+typedef _Float16 __clc_vec4_float16_t __attribute__((ext_vector_type(4)));
+typedef _Float16 __clc_vec8_float16_t __attribute__((ext_vector_type(8)));
+typedef _Float16 __clc_vec16_float16_t __attribute__((ext_vector_type(16)));
+
+#endif
 typedef __clc_int64_t __clc_size_t;
 
 #ifdef __SYCL_DEVICE_ONLY__

libclc/generic/libspirv/SOURCES

@@ -1,3 +1,4 @@
+float16.cl
 subnormal_config.cl
 subnormal_helper_func.ll
 async/async_work_group_strided_copy.cl