libc/test/src/math/tan_test.cpp

   1 //===-- Unittests for tan -------------------------------------------------===//
   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/math/tan.h"
  10 #include "test/UnitTest/FPMatcher.h"
  11 #include "test/UnitTest/Test.h"
  12 #include "utils/MPFRWrapper/MPFRUtils.h"
  13
  14 #include <math.h>
  15
  16 namespace mpfr = __llvm_libc::testing::mpfr;
  17
  18 DECLARE_SPECIAL_CONSTANTS(double)
  19
  20 TEST(LlvmLibctanTest, Range) {
  21   static constexpr double _2pi = 6.283185307179586;
  22   constexpr UIntType COUNT = 10000000;
  23   constexpr UIntType STEP = UIntType(-1) / COUNT;
  24   for (UIntType i = 0, v = 0; i <= COUNT; ++i, v += STEP) {
  25     double x = double(FPBits(v));
  26     // TODO: Expand the range of testing after range reduction is implemented.
  27     if (isnan(x) || isinf(x) || x > _2pi || x < -_2pi)
  28       continue;
  29
  30     ASSERT_MPFR_MATCH(mpfr::Operation::Tan, x, __llvm_libc::tan(x), 1.0);
  31   }
  32 }