libc/test/src/math/exp10f_test.cpp

   1 //===-- Unittests for exp10f ----------------------------------------------===//
   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/math/exp10f.h"
  11 #include "test/UnitTest/FPMatcher.h"
  12 #include "test/UnitTest/Test.h"
  13 #include "utils/MPFRWrapper/MPFRUtils.h"
  14 #include <math.h>
  15
  16 #include <errno.h>
  17 #include <stdint.h>
  18
  19 namespace mpfr = __llvm_libc::testing::mpfr;
  20
  21 DECLARE_SPECIAL_CONSTANTS(float)
  22
  23 TEST(LlvmLibcExp10fTest, SpecialNumbers) {
  24   errno = 0;
  25
  26   EXPECT_FP_EQ(aNaN, __llvm_libc::exp10f(aNaN));
  27   EXPECT_MATH_ERRNO(0);
  28
  29   EXPECT_FP_EQ(inf, __llvm_libc::exp10f(inf));
  30   EXPECT_MATH_ERRNO(0);
  31
  32   EXPECT_FP_EQ(0.0f, __llvm_libc::exp10f(neg_inf));
  33   EXPECT_MATH_ERRNO(0);
  34
  35   EXPECT_FP_EQ(1.0f, __llvm_libc::exp10f(0.0f));
  36   EXPECT_MATH_ERRNO(0);
  37
  38   EXPECT_FP_EQ(1.0f, __llvm_libc::exp10f(-0.0f));
  39   EXPECT_MATH_ERRNO(0);
  40 }
  41
  42 TEST(LlvmLibcExp10fTest, Overflow) {
  43   errno = 0;
  44   EXPECT_FP_EQ(inf, __llvm_libc::exp10f(float(FPBits(0x7f7fffffU))));
  45   EXPECT_MATH_ERRNO(ERANGE);
  46
  47   EXPECT_FP_EQ(inf, __llvm_libc::exp10f(float(FPBits(0x43000000U))));
  48   EXPECT_MATH_ERRNO(ERANGE);
  49
  50   EXPECT_FP_EQ(inf, __llvm_libc::exp10f(float(FPBits(0x43000001U))));
  51   EXPECT_MATH_ERRNO(ERANGE);
  52 }
  53
  54 TEST(LlvmLibcExp10fTest, TrickyInputs) {
  55   constexpr int N = 20;
  56   constexpr uint32_t INPUTS[N] = {
  57       0x325e5bd8, // x = 0x1.bcb7bp-27f
  58       0x325e5bd9, // x = 0x1.bcb7b2p-27f
  59       0x325e5bda, // x = 0x1.bcb7b4p-27f
  60       0x3d14d956, // x = 0x1.29b2acp-5f
  61       0x4116498a, // x = 0x1.2c9314p3f
  62       0x4126f431, // x = 0x1.4de862p3f
  63       0x4187d13c, // x = 0x1.0fa278p4f
  64       0x4203e9da, // x = 0x1.07d3b4p5f
  65       0x420b5f5d, // x = 0x1.16bebap5f
  66       0x42349e35, // x = 0x1.693c6ap5f
  67       0x3f800000, // x = 1.0f
  68       0x40000000, // x = 2.0f
  69       0x40400000, // x = 3.0f
  70       0x40800000, // x = 4.0f
  71       0x40a00000, // x = 5.0f
  72       0x40c00000, // x = 6.0f
  73       0x40e00000, // x = 7.0f
  74       0x41000000, // x = 8.0f
  75       0x41100000, // x = 9.0f
  76       0x41200000, // x = 10.0f
  77   };
  78   for (int i = 0; i < N; ++i) {
  79     errno = 0;
  80     float x = float(FPBits(INPUTS[i]));
  81     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x,
  82                                    __llvm_libc::exp10f(x), 0.5);
  83     EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, -x,
  84                                    __llvm_libc::exp10f(-x), 0.5);
  85   }
  86 }
  87
  88 TEST(LlvmLibcExp10fTest, InFloatRange) {
  89   constexpr uint32_t COUNT = 1000000;
  90   constexpr uint32_t STEP = UINT32_MAX / COUNT;
  91   for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  92     float x = float(FPBits(v));
  93     if (isnan(x) || isinf(x))
  94       continue;
  95     errno = 0;
  96     float result = __llvm_libc::exp10f(x);
  97
  98     // If the computation resulted in an error or did not produce valid result
  99     // in the single-precision floating point range, then ignore comparing with
 100     // MPFR result as MPFR can still produce valid results because of its
 101     // wider precision.
 102     if (isnan(result) || isinf(result) || errno != 0)
 103       continue;
 104     ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp10, x,
 105                                    __llvm_libc::exp10f(x), 0.5);
 106   }
 107 }