[libc-commits] [libc] [libc][math][c23] Add acosf16() function (PR #127731)

[via libc-commits]

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@@ -0,0 +1,146 @@
+//===-- Half-precision acosf16(x) 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/acosf16.h"
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/except_value_utils.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// Generated by Sollya using the following command:
+// > round(pi/2, D, RN);
+// > round(pi, D, RN);
+static constexpr float PI_2 = 0x1.921fb54442d18p0f;
+static constexpr float PI = 0x1.921fb54442d18p1f;
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wldfngrs wrote:

> Do we not have this defined in any other file already? float pi at least.

They are defined, but they're doubles.
https://github.com/llvm/llvm-project/blob/3836559e65b002579e2c6697969557ffbbb8cc7d/libc/src/math/generic/inv_trigf_utils.h#L20-L21

> You might as well generate pi rounded to SG already with Sollya btw.

Yeah, I'd update the PR to reflect that.

https://github.com/llvm/llvm-project/pull/127731