libc/test/src/math/FMaxTest.h

   1 //===-- Utility class to test fmin[f|l] -------------------------*- C++ -*-===//
   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 "test/UnitTest/FPMatcher.h"
  10 #include "test/UnitTest/Test.h"
  11 #include "utils/MPFRWrapper/MPFRUtils.h"
  12
  13 #include <math.h>
  14
  15 namespace mpfr = __llvm_libc::testing::mpfr;
  16
  17 template <typename T> class FMaxTest : public __llvm_libc::testing::Test {
  18
  19   DECLARE_SPECIAL_CONSTANTS(T)
  20
  21 public:
  22   typedef T (*FMaxFunc)(T, T);
  23
  24   void testNaN(FMaxFunc func) {
  25     EXPECT_FP_EQ(inf, func(aNaN, inf));
  26     EXPECT_FP_EQ(neg_inf, func(neg_inf, aNaN));
  27     EXPECT_FP_EQ(0.0, func(aNaN, 0.0));
  28     EXPECT_FP_EQ(-0.0, func(-0.0, aNaN));
  29     EXPECT_FP_EQ(T(-1.2345), func(aNaN, T(-1.2345)));
  30     EXPECT_FP_EQ(T(1.2345), func(T(1.2345), aNaN));
  31     EXPECT_FP_EQ(aNaN, func(aNaN, aNaN));
  32   }
  33
  34   void testInfArg(FMaxFunc func) {
  35     EXPECT_FP_EQ(inf, func(neg_inf, inf));
  36     EXPECT_FP_EQ(inf, func(inf, 0.0));
  37     EXPECT_FP_EQ(inf, func(-0.0, inf));
  38     EXPECT_FP_EQ(inf, func(inf, T(1.2345)));
  39     EXPECT_FP_EQ(inf, func(T(-1.2345), inf));
  40   }
  41
  42   void testNegInfArg(FMaxFunc func) {
  43     EXPECT_FP_EQ(inf, func(inf, neg_inf));
  44     EXPECT_FP_EQ(0.0, func(neg_inf, 0.0));
  45     EXPECT_FP_EQ(-0.0, func(-0.0, neg_inf));
  46     EXPECT_FP_EQ(T(-1.2345), func(neg_inf, T(-1.2345)));
  47     EXPECT_FP_EQ(T(1.2345), func(T(1.2345), neg_inf));
  48   }
  49
  50   void testBothZero(FMaxFunc func) {
  51     EXPECT_FP_EQ(0.0, func(0.0, 0.0));
  52     EXPECT_FP_EQ(0.0, func(-0.0, 0.0));
  53     EXPECT_FP_EQ(0.0, func(0.0, -0.0));
  54     EXPECT_FP_EQ(-0.0, func(-0.0, -0.0));
  55   }
  56
  57   void testRange(FMaxFunc func) {
  58     constexpr UIntType COUNT = 10000001;
  59     constexpr UIntType STEP = UIntType(-1) / COUNT;
  60     for (UIntType i = 0, v = 0, w = UIntType(-1); i <= COUNT;
  61          ++i, v += STEP, w -= STEP) {
  62       T x = T(FPBits(v)), y = T(FPBits(w));
  63       if (isnan(x) || isinf(x))
  64         continue;
  65       if (isnan(y) || isinf(y))
  66         continue;
  67       if ((x == 0) && (y == 0))
  68         continue;
  69
  70       if (x > y) {
  71         EXPECT_FP_EQ(x, func(x, y));
  72       } else {
  73         EXPECT_FP_EQ(y, func(x, y));
  74       }
  75     }
  76   }
  77 };
  78
  79 #define LIST_FMAX_TESTS(T, func)                                               \
  80   using LlvmLibcFMaxTest = FMaxTest<T>;                                        \
  81   TEST_F(LlvmLibcFMaxTest, NaN) { testNaN(&func); }                            \
  82   TEST_F(LlvmLibcFMaxTest, InfArg) { testInfArg(&func); }                      \
  83   TEST_F(LlvmLibcFMaxTest, NegInfArg) { testNegInfArg(&func); }                \
  84   TEST_F(LlvmLibcFMaxTest, BothZero) { testBothZero(&func); }                  \
  85   TEST_F(LlvmLibcFMaxTest, Range) { testRange(&func); }