[libc][NFC] Don't expose how float16 and float128 types are provided (#83818)

Umbrella bug #83182

Author: gchatelet

libc/include/llvm-libc-types/float128.h

@@ -19,18 +19,17 @@
 //   https://github.com/llvm/llvm-project/issues/80195
 #if defined(__STDC_IEC_60559_BFP__) && !defined(__clang__) &&                  \
     !defined(__cplusplus)
-// Use _Float128 C23 type.
-#define LIBC_COMPILER_HAS_C23_FLOAT128
+#define LIBC_TYPES_HAS_FLOAT128
 typedef _Float128 float128;
 #elif defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)
 // Use __float128 type.  gcc and clang sometime use __SIZEOF_FLOAT128__ to
 // notify the availability of __float128.
 // clang also uses __FLOAT128__ macro to notify the availability of __float128
 // type: https://reviews.llvm.org/D15120
-#define LIBC_COMPILER_HAS_FLOAT128_EXTENSION
+#define LIBC_TYPES_HAS_FLOAT128
 typedef __float128 float128;
 #elif (LDBL_MANT_DIG == 113)
-// Use long double.
+#define LIBC_TYPES_HAS_FLOAT128
 typedef long double float128;
 #endif
 

libc/src/__support/macros/properties/types.h

@@ -26,7 +26,7 @@
 #define LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128
 #endif
 
-// float16 support.
+// -- float16 support ---------------------------------------------------------
 // TODO: move this logic to "llvm-libc-types/float16.h"
 #if defined(LIBC_TARGET_ARCH_IS_X86_64) && defined(LIBC_TARGET_CPU_HAS_SSE2)
 #if (defined(LIBC_COMPILER_CLANG_VER) && (LIBC_COMPILER_CLANG_VER >= 1500)) || \
@@ -50,11 +50,8 @@ using float16 = _Float16;
 #endif
 #endif
 
-// float128 support.
-#if defined(LIBC_COMPILER_HAS_C23_FLOAT128) ||                                 \
-    defined(LIBC_COMPILER_HAS_FLOAT128_EXTENSION) ||                           \
-    defined(LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128)
-#define LIBC_TYPES_HAS_FLOAT128
-#endif
+// -- float128 support --------------------------------------------------------
+// LIBC_TYPES_HAS_FLOAT128 and 'float128' type are provided by
+// "include/llvm-libc-types/float128.h"
 
 #endif // LLVM_LIBC_SRC___SUPPORT_MACROS_PROPERTIES_TYPES_H