feat: implement nanbf16 math function

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/src/math/CMakeLists.txt

@@ -420,6 +420,7 @@ add_math_entrypoint_object(nanf)
 add_math_entrypoint_object(nanl)
 add_math_entrypoint_object(nanf16)
 add_math_entrypoint_object(nanf128)
+add_math_entrypoint_object(nanbf16)
 
 add_math_entrypoint_object(nearbyint)
 add_math_entrypoint_object(nearbyintf)

libc/src/math/generic/CMakeLists.txt

@@ -3444,6 +3444,22 @@ add_entrypoint_object(
     libc.src.errno.errno
 )
 
+add_entrypoint_object(
+  nanbf16
+  SRCS
+    nanbf16.cpp
+  HDRS
+    ../nanbf16.h
+  DEPENDS
+    libc.src.errno.errno
+    libc.src.__support.common
+    libc.src.__support.FPUtil.bfloat16
+    libc.src.__support.libc_errno
+    libc.src.__support.macros.config
+    libc.src.__support.macros.properties.types
+    libc.src.__support.str_to_float
+)
+
 add_entrypoint_object(
   nextafter
   SRCS

libc/src/math/generic/nanbf16.cpp

@@ -0,0 +1,25 @@
+//===-- Implementation of nanbf16 function --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/math/nanbf16.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/str_to_float.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, nanbf16, (const char *arg)) {
+  auto result = internal::strtonan<bfloat16>(arg);
+  if (result.has_error())
+    libc_errno = result.error;
+  return result.value;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/src/math/nanbf16.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for nanbf16 -----------------------*- C++ -*-===//
+//
+// 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_SRC_MATH_NANBF16_H
+#define LLVM_LIBC_SRC_MATH_NANBF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 nanbf16(const char *arg);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_NANBF16_H