[libc-commits] [libc] [llvm] [libc][math][c23] Add acosbf16 math function (PR #184633)

[via libc-commits]

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@@ -0,0 +1,94 @@
+//===-- Implementation header for acosbf16 ----------------------*- 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___SUPPORT_MATH_ACOSBF16_H
+#define LLVM_LIBC_SRC___SUPPORT_MATH_ACOSBF16_H
+
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/macros/optimization.h"
+#include "src/__support/math/inv_trigf_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+namespace math {
+
+LIBC_INLINE bfloat16 acosbf16(bfloat16 x) {
+  // Generated by Sollya using the following command:
+  // > display = hexadecimal;
+  // > round(pi/2, SG, RN);
+  constexpr float PI_2 = 0x1.921fb6p0f;
+  // > round(pi, SG, RN);
+  constexpr float PI = 0x1.921fb6p1;
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lntue wrote:

`0x1.921fb6p1f`

https://github.com/llvm/llvm-project/pull/184633