1 //===-- Unittests for atan ------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "src/math/atan.h"
10 #include "test/UnitTest/FPMatcher.h"
11 #include "test/UnitTest/Test.h"
12
13 using LlvmLibcAtanTest = LIBC_NAMESPACE::testing::FPTest<double>;
14
TEST_F(LlvmLibcAtanTest,SpecialNumbers)15 TEST_F(LlvmLibcAtanTest, SpecialNumbers) {
16 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atan(aNaN));
17 // atan(sNaN) = aNaN.
18 EXPECT_EQ(FPBits(aNaN).uintval(),
19 FPBits(LIBC_NAMESPACE::atan(sNaN)).uintval());
20 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::atan(zero));
21 EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::atan(neg_zero));
22 // atan(+-Inf) = +- pi/2.
23 EXPECT_FP_EQ(0x1.921fb54442d18p0, LIBC_NAMESPACE::atan(inf));
24 EXPECT_FP_EQ(-0x1.921fb54442d18p0, LIBC_NAMESPACE::atan(neg_inf));
25 // atan(+-1) = +- pi/4.
26 EXPECT_FP_EQ(0x1.921fb54442d18p-1, LIBC_NAMESPACE::atan(1.0));
27 EXPECT_FP_EQ(-0x1.921fb54442d18p-1, LIBC_NAMESPACE::atan(-1.0));
28 }
29