libc/test/src/math/atanf_test.cpp

   1 //===-- Unittests for atanf -----------------------------------------------===//
   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 "hdr/math_macros.h"
  10 #include "src/__support/FPUtil/FPBits.h"
  11 #include "src/errno/libc_errno.h"
  12 #include "src/math/atanf.h"
  13 #include "test/UnitTest/FPMatcher.h"
  14 #include "test/UnitTest/Test.h"
  15 #include "utils/MPFRWrapper/MPFRUtils.h"
  16
  17 #include <stdint.h>
  18
  19 using LlvmLibcAtanfTest = LIBC_NAMESPACE::testing::FPTest<float>;
  20
  21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
  22
  23 // TODO: This test needs to have its checks for exceptions, errno
  24 // tightened
  25 TEST_F(LlvmLibcAtanfTest, SpecialNumbers) {
  26   LIBC_NAMESPACE::libc_errno = 0;
  27   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
  28   EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::atanf(aNaN));
  29   // TODO: Uncomment these checks later, RoundingMode affects running
  30   // tests in this way https://github.com/llvm/llvm-project/issues/90653.
  31   // EXPECT_FP_EXCEPTION(0);
  32   EXPECT_MATH_ERRNO(0);
  33
  34   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
  35   EXPECT_FP_EQ_ALL_ROUNDING(0.0f, LIBC_NAMESPACE::atanf(0.0f));
  36   // TODO: Uncomment these checks later, RoundingMode affects running
  37   // tests in this way https://github.com/llvm/llvm-project/issues/90653.
  38   // EXPECT_FP_EXCEPTION(0);
  39   EXPECT_MATH_ERRNO(0);
  40
  41   LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);
  42   EXPECT_FP_EQ_ALL_ROUNDING(-0.0f, LIBC_NAMESPACE::atanf(-0.0f));
  43   // TODO: Uncomment these checks later, RoundingMode affects running
  44   // tests in this way https://github.com/llvm/llvm-project/issues/90653.
  45   // EXPECT_FP_EXCEPTION(0);
  46   EXPECT_MATH_ERRNO(0);
  47 }
  48
  49 TEST_F(LlvmLibcAtanfTest, InFloatRange) {
  50   constexpr uint32_t COUNT = 100'000;
  51   const uint32_t STEP = FPBits(inf).uintval() / COUNT;
  52   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  53     float x = FPBits(v).get_val();
  54     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
  55                                    LIBC_NAMESPACE::atanf(x), 0.5);
  56     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, -x,
  57                                    LIBC_NAMESPACE::atanf(-x), 0.5);
  58   }
  59 }
  60
  61 // For small values, tanh(x) is x.
  62 TEST_F(LlvmLibcAtanfTest, SpecialValues) {
  63   uint32_t val_arr[] = {
  64       0x3d8d6b23U, // x = 0x1.1ad646p-4f
  65       0x3dbb6ac7U, // x = 0x1.76d58ep-4f
  66       0x3feefcfbU, // x = 0x1.ddf9f6p+0f
  67       0x3ffe2ec1U, // x = 0x1.fc5d82p+0f
  68       0xbd8d6b23U, // x = -0x1.1ad646p-4f
  69       0xbdbb6ac7U, // x = -0x1.76d58ep-4f
  70       0xbfeefcfbU, // x = -0x1.ddf9f6p+0f
  71       0xbffe2ec1U, // x = -0x1.fc5d82p+0
  72       0x7F800000U, // x = +Inf
  73       0xFF800000U, // x = -Inf
  74   };
  75   for (uint32_t v : val_arr) {
  76     float x = FPBits(v).get_val();
  77     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Atan, x,
  78                                    LIBC_NAMESPACE::atanf(x), 0.5);
  79   }
  80 }