libc/test/src/math/tanhf_test.cpp

   1 //===-- Unittests for tanhf -----------------------------------------------===//
   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/tanhf.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 LlvmLibcTanhfTest = LIBC_NAMESPACE::testing::FPTest<float>;
  20
  21 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
  22
  23 TEST_F(LlvmLibcTanhfTest, SpecialNumbers) {
  24   LIBC_NAMESPACE::libc_errno = 0;
  25
  26   EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::tanhf(aNaN));
  27   EXPECT_MATH_ERRNO(0);
  28
  29   EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::tanhf(0.0f));
  30   EXPECT_MATH_ERRNO(0);
  31
  32   EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::tanhf(-0.0f));
  33   EXPECT_MATH_ERRNO(0);
  34
  35   EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::tanhf(inf));
  36   EXPECT_MATH_ERRNO(0);
  37
  38   EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::tanhf(neg_inf));
  39   EXPECT_MATH_ERRNO(0);
  40 }
  41
  42 TEST_F(LlvmLibcTanhfTest, InFloatRange) {
  43   constexpr uint32_t COUNT = 100'001;
  44   constexpr uint32_t STEP = UINT32_MAX / COUNT;
  45   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  46     float x = FPBits(v).get_val();
  47     if (FPBits(v).is_nan() || FPBits(v).is_inf())
  48       continue;
  49     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
  50                                    LIBC_NAMESPACE::tanhf(x), 0.5);
  51   }
  52 }
  53
  54 TEST_F(LlvmLibcTanhfTest, ExceptionalValues) {
  55   constexpr int N = 4;
  56   constexpr uint32_t INPUTS[N] = {
  57       0x0040'0000,
  58       0x1780'0000,
  59       0x3a12'85ff,
  60       0x4058'e0a3,
  61   };
  62
  63   for (int i = 0; i < N; ++i) {
  64     float x = FPBits(INPUTS[i]).get_val();
  65     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
  66                                    LIBC_NAMESPACE::tanhf(x), 0.5);
  67     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, -x,
  68                                    LIBC_NAMESPACE::tanhf(-x), 0.5);
  69   }
  70 }