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 "src/__support/FPUtil/FPBits.h"
  10 #include "src/errno/libc_errno.h"
  11 #include "src/math/tanhf.h"
  12 #include "test/UnitTest/FPMatcher.h"
  13 #include "test/UnitTest/Test.h"
  14 #include "utils/MPFRWrapper/MPFRUtils.h"
  15 #include <math.h>
  16
  17 #include <errno.h>
  18 #include <stdint.h>
  19
  20 using LlvmLibcTanhfTest = LIBC_NAMESPACE::testing::FPTest<float>;
  21
  22 namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
  23
  24 TEST_F(LlvmLibcTanhfTest, SpecialNumbers) {
  25   libc_errno = 0;
  26
  27   EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::tanhf(aNaN));
  28   EXPECT_MATH_ERRNO(0);
  29
  30   EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::tanhf(0.0f));
  31   EXPECT_MATH_ERRNO(0);
  32
  33   EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::tanhf(-0.0f));
  34   EXPECT_MATH_ERRNO(0);
  35
  36   EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::tanhf(inf));
  37   EXPECT_MATH_ERRNO(0);
  38
  39   EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::tanhf(neg_inf));
  40   EXPECT_MATH_ERRNO(0);
  41 }
  42
  43 TEST_F(LlvmLibcTanhfTest, InFloatRange) {
  44   constexpr uint32_t COUNT = 100'001;
  45   constexpr uint32_t STEP = UINT32_MAX / COUNT;
  46   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  47     float x = float(FPBits(v));
  48     if (isnan(x) || isinf(x))
  49       continue;
  50     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
  51                                    LIBC_NAMESPACE::tanhf(x), 0.5);
  52   }
  53 }
  54
  55 TEST_F(LlvmLibcTanhfTest, ExceptionalValues) {
  56   constexpr int N = 4;
  57   constexpr uint32_t INPUTS[N] = {
  58       0x0040'0000,
  59       0x1780'0000,
  60       0x3a12'85ff,
  61       0x4058'e0a3,
  62   };
  63
  64   for (int i = 0; i < N; ++i) {
  65     float x = float(FPBits(INPUTS[i]));
  66     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, x,
  67                                    LIBC_NAMESPACE::tanhf(x), 0.5);
  68     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Tanh, -x,
  69                                    LIBC_NAMESPACE::tanhf(-x), 0.5);
  70   }
  71 }