[libc-commits] [libc] [libc] Fix generated float128 header for aarch64 target. (PR #78017)

[Nick Desaulniers via libc-commits]

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@@ -0,0 +1,31 @@
+//===-- Definition of float128 type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_FLOAT128_H__
+#define __LLVM_LIBC_TYPES_FLOAT128_H__
+
+#if defined(__clang__)
+#define LIBC_COMPILER_IS_CLANG
+#define LIBC_COMPILER_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
+#elif defined(__GNUC__)
+#define LIBC_COMPILER_IS_GCC
+#define LIBC_COMPILER_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
+#endif
+
+#if (defined(LIBC_COMPILER_GCC_VER) && (LIBC_COMPILER_GCC_VER >= 1301)) &&     \
+    (defined(__aarch64__) || defined(__riscv) || defined(__x86_64__))
+typedef _Float128 float128;
+#elif (defined(LIBC_COMPILER_CLANG_VER) &&                                     \
+       (LIBC_COMPILER_CLANG_VER >= 600)) &&                                    \
+    (defined(__x86_64__) && !defined(__Fuchsia__))
+typedef __float128 float128;
+#elif (LDBL_MANT_DIG == 113) || (__LDBL_MANT_DIG__ == 113)
+typedef long double float128;
+#endif
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nickdesaulniers wrote:

This seems to duplicate logic from libc/src/__support/macros/properties/float.h (`LIBC_COMPILER_HAS_C23_FLOAT128`, `LIBC_COMPILER_HAS_FLOAT128_EXTENSION`, and `LIBC_LONG_DOUBLE_IS_FLOAT128`).  Surely we can DRY up the code between the two?

https://github.com/llvm/llvm-project/pull/78017