libc/test/src/math/FAbsTest.h

   1 //===-- Utility class to test fabs[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 = LIBC_NAMESPACE::testing::mpfr;
  16
  17 template <typename T> class FAbsTest : public LIBC_NAMESPACE::testing::Test {
  18
  19   DECLARE_SPECIAL_CONSTANTS(T)
  20
  21 public:
  22   typedef T (*FabsFunc)(T);
  23
  24   void testSpecialNumbers(FabsFunc func) {
  25     EXPECT_FP_EQ(aNaN, func(aNaN));
  26
  27     EXPECT_FP_EQ(inf, func(inf));
  28     EXPECT_FP_EQ(inf, func(neg_inf));
  29
  30     EXPECT_FP_EQ(zero, func(zero));
  31     EXPECT_FP_EQ(zero, func(neg_zero));
  32   }
  33
  34   void testRange(FabsFunc func) {
  35     constexpr UIntType COUNT = 100'000;
  36     constexpr UIntType STEP = UIntType(-1) / COUNT;
  37     for (UIntType i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  38       T x = T(FPBits(v));
  39       if (isnan(x) || isinf(x))
  40         continue;
  41       ASSERT_MPFR_MATCH(mpfr::Operation::Abs, x, func(x), 0.0);
  42     }
  43   }
  44 };
  45
  46 #define LIST_FABS_TESTS(T, func)                                               \
  47   using LlvmLibcFAbsTest = FAbsTest<T>;                                        \
  48   TEST_F(LlvmLibcFAbsTest, SpecialNumbers) { testSpecialNumbers(&func); }      \
  49   TEST_F(LlvmLibcFAbsTest, Range) { testRange(&func); }