[libc][math] Refactor atan2f implementation to header-only in src/__support/math folder.

libc/shared/math.h

@@ -24,6 +24,7 @@
 #include "math/asinhf16.h"
 #include "math/atan.h"
 #include "math/atan2.h"
+#include "math/atan2f.h"
 #include "math/atanf.h"
 #include "math/atanf16.h"
 #include "math/erff.h"

libc/shared/math/atan2f.h

@@ -0,0 +1,23 @@
+//===-- Shared atan2f function ----------------------------------*- 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_SHARED_MATH_ATAN2F_H
+#define LLVM_LIBC_SHARED_MATH_ATAN2F_H
+
+#include "shared/libc_common.h"
+#include "src/__support/math/atan2f.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace shared {
+
+using math::atan2f;
+
+} // namespace shared
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SHARED_MATH_ATAN2F_H

libc/src/__support/math/CMakeLists.txt

@@ -213,6 +213,23 @@ add_header_library(
     libc.src.__support.macros.optimization
 )
 
+add_header_library(
+  atan2f
+  HDRS
+    atan2f_float.h
+    atan2f.h
+  DEPENDS
+    .inv_trigf_utils
+    libc.src.__support.FPUtil.double_double
+    libc.src.__support.FPUtil.fenv_impl
+    libc.src.__support.FPUtil.fp_bits
+    libc.src.__support.FPUtil.multiply_add
+    libc.src.__support.FPUtil.nearest_integer
+    libc.src.__support.FPUtil.polyeval
+    libc.src.__support.macros.config
+    libc.src.__support.macros.optimization
+)
+
 add_header_library(
   atanf
   HDRS