1 //===-- Utility class to test different flavors of fdim ---------*- 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 "src/__support/CPP/algorithm.h" 10 #include "src/__support/FPUtil/FPBits.h" 11 #include "test/UnitTest/FEnvSafeTest.h" 12 #include "test/UnitTest/FPMatcher.h" 13 #include "test/UnitTest/Test.h" 14 15 template <typename T> 16 class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest { 17 public: 18 using FuncPtr = T (*)(T, T); 19 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>; 20 using StorageType = typename FPBits::StorageType; 21 22 const T inf = FPBits::inf(Sign::POS).get_val(); 23 const T neg_inf = FPBits::inf(Sign::NEG).get_val(); 24 const T zero = FPBits::zero(Sign::POS).get_val(); 25 const T neg_zero = FPBits::zero(Sign::NEG).get_val(); 26 const T nan = FPBits::quiet_nan().get_val(); 27 test_nan_arg(FuncPtr func)28 void test_nan_arg(FuncPtr func) { 29 EXPECT_FP_EQ(nan, func(nan, inf)); 30 EXPECT_FP_EQ(nan, func(neg_inf, nan)); 31 EXPECT_FP_EQ(nan, func(nan, zero)); 32 EXPECT_FP_EQ(nan, func(neg_zero, nan)); 33 EXPECT_FP_EQ(nan, func(nan, T(-1.2345))); 34 EXPECT_FP_EQ(nan, func(T(1.2345), nan)); 35 EXPECT_FP_EQ(func(nan, nan), nan); 36 } 37 test_inf_arg(FuncPtr func)38 void test_inf_arg(FuncPtr func) { 39 EXPECT_FP_EQ(zero, func(neg_inf, inf)); 40 EXPECT_FP_EQ(inf, func(inf, zero)); 41 EXPECT_FP_EQ(zero, func(neg_zero, inf)); 42 EXPECT_FP_EQ(inf, func(inf, T(1.2345))); 43 EXPECT_FP_EQ(zero, func(T(-1.2345), inf)); 44 } 45 test_neg_inf_arg(FuncPtr func)46 void test_neg_inf_arg(FuncPtr func) { 47 EXPECT_FP_EQ(inf, func(inf, neg_inf)); 48 EXPECT_FP_EQ(zero, func(neg_inf, zero)); 49 EXPECT_FP_EQ(inf, func(neg_zero, neg_inf)); 50 EXPECT_FP_EQ(zero, func(neg_inf, T(-1.2345))); 51 EXPECT_FP_EQ(inf, func(T(1.2345), neg_inf)); 52 } 53 test_both_zero(FuncPtr func)54 void test_both_zero(FuncPtr func) { 55 EXPECT_FP_EQ(zero, func(zero, zero)); 56 EXPECT_FP_EQ(zero, func(zero, neg_zero)); 57 EXPECT_FP_EQ(zero, func(neg_zero, zero)); 58 EXPECT_FP_EQ(zero, func(neg_zero, neg_zero)); 59 } 60 test_in_range(FuncPtr func)61 void test_in_range(FuncPtr func) { 62 constexpr StorageType STORAGE_MAX = 63 LIBC_NAMESPACE::cpp::numeric_limits<StorageType>::max(); 64 constexpr int COUNT = 100'001; 65 constexpr StorageType STEP = LIBC_NAMESPACE::cpp::max( 66 static_cast<StorageType>(STORAGE_MAX / COUNT), StorageType(1)); 67 StorageType v = 0, w = STORAGE_MAX; 68 for (int i = 0; i <= COUNT; ++i, v += STEP, w -= STEP) { 69 FPBits xbits(v), ybits(w); 70 if (xbits.is_inf_or_nan()) 71 continue; 72 if (ybits.is_inf_or_nan()) 73 continue; 74 75 T x = xbits.get_val(); 76 T y = ybits.get_val(); 77 78 if (x > y) { 79 EXPECT_FP_EQ(x - y, func(x, y)); 80 } else { 81 EXPECT_FP_EQ(zero, func(x, y)); 82 } 83 } 84 } 85 }; 86 87 #define LIST_FDIM_TESTS(T, func) \ 88 using LlvmLibcFDimTest = FDimTestTemplate<T>; \ 89 TEST_F(LlvmLibcFDimTest, NaNArg) { test_nan_arg(&func); } \ 90 TEST_F(LlvmLibcFDimTest, InfArg) { test_inf_arg(&func); } \ 91 TEST_F(LlvmLibcFDimTest, NegInfArg) { test_neg_inf_arg(&func); } \ 92 TEST_F(LlvmLibcFDimTest, BothZero) { test_both_zero(&func); } \ 93 TEST_F(LlvmLibcFDimTest, InFloatRange) { test_in_range(&func); } \ 94 static_assert(true, "Require semicolon.") 95