[libc-commits] [libc] [libc][math][c23] Implement C23 math function atanpif16 (PR #150400)

[via libc-commits]

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+//===-- Unittests for atanpif16 -------------------------------------------===//
+//
+// 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/__support/libc_errno.h"
+#include "src/math/atanpif16.h"
+#include "test/UnitTest/FPMatcher.h"
+
+using LIBC_NAMESPACE::cpp::array;
+using LlvmLibcAtanpif16Test = LIBC_NAMESPACE::testing::FPTest<float16>;
+
+TEST_F(LlvmLibcAtanpif16Test, SpecialNumbers) {
+  // zero
+  EXPECT_FP_EQ(zero, LIBC_NAMESPACE::atanpif16(zero));
+  EXPECT_FP_EQ(neg_zero, LIBC_NAMESPACE::atanpif16(neg_zero));
+
+  // NaN inputs
+  EXPECT_FP_EQ(FPBits::quiet_nan().get_val(),
+               LIBC_NAMESPACE::atanpif16(FPBits::quiet_nan().get_val()));
+
+  EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::atanpif16(aNaN));
+
+  // infinity inputs -> should return +/-0.5
+  EXPECT_FP_EQ(0.5f16, LIBC_NAMESPACE::atanpif16(inf));
+  EXPECT_FP_EQ(-0.5f16, LIBC_NAMESPACE::atanpif16(neg_inf));
+}
+
+TEST_F(LlvmLibcAtanpif16Test, SymmetryProperty) {
+  // Test that atanpi(-x) = -atanpi(x)
+  constexpr float16 TEST_VALS[] = {0.1f16,  0.25f16, 0.5f16,   0.75f16,
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overmighty wrote:

Nit: might as well use `cpp::array` here too for consistency.

https://github.com/llvm/llvm-project/pull/150400