[libc-commits] [libc] [libc][math][c23] Add atanhf16 C23 math function. (PR #132612)

[Harrison Hao via libc-commits]

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@@ -0,0 +1,86 @@
+//===-- Implementation of atanh(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/atanhf16.h"
+#include "explogxf.h"
+#include "hdr/errno_macros.h"
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/FPUtil/PolyEval.h"
+#include "src/__support/FPUtil/cast.h"
+#include "src/__support/FPUtil/multiply_add.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/optimization.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(float16, atanhf16, (float16 x)) {
+  using FPBits = typename fputil::FPBits<float16>;
+
+  FPBits xbits(x);
+  Sign sign = xbits.sign();
+  uint16_t x_abs = xbits.abs().uintval();
+
+  if (LIBC_UNLIKELY(x_abs >= 0x3c00U)) {
+    if (xbits.is_nan()) {
+      return x;
+    }
+    // |x| == 1.0
+    if (x_abs == 0x3c00U) {
+      fputil::set_errno_if_required(ERANGE);
+      fputil::raise_except_if_required(FE_DIVBYZERO);
+      return FPBits::inf(sign).get_val();
+    } else {
+      fputil::set_errno_if_required(EDOM);
+      fputil::raise_except_if_required(FE_INVALID);
+      return FPBits::quiet_nan().get_val();
+    }
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harrisonGPU wrote:

Okay, I have updated it.

https://github.com/llvm/llvm-project/pull/132612