libc/test/src/fenv/rounding_mode_test.cpp

   1 //===-- Unittests for fegetround and fesetround ---------------------------===//
   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/fenv/fegetround.h"
  10 #include "src/fenv/fesetround.h"
  11
  12 #include "test/UnitTest/FEnvSafeTest.h"
  13 #include "test/UnitTest/Test.h"
  14
  15 #include "hdr/fenv_macros.h"
  16
  17 using LlvmLibcRoundingModeTest = LIBC_NAMESPACE::testing::FEnvSafeTest;
  18
  19 TEST_F(LlvmLibcRoundingModeTest, SetAndGet) {
  20   struct ResetDefaultRoundingMode {
  21     int original = LIBC_NAMESPACE::fegetround();
  22     ~ResetDefaultRoundingMode() { LIBC_NAMESPACE::fesetround(original); }
  23   } reset;
  24
  25   int s = LIBC_NAMESPACE::fesetround(FE_TONEAREST);
  26   EXPECT_EQ(s, 0);
  27   int rm = LIBC_NAMESPACE::fegetround();
  28   EXPECT_EQ(rm, FE_TONEAREST);
  29
  30   s = LIBC_NAMESPACE::fesetround(FE_UPWARD);
  31   EXPECT_EQ(s, 0);
  32   rm = LIBC_NAMESPACE::fegetround();
  33   EXPECT_EQ(rm, FE_UPWARD);
  34
  35   s = LIBC_NAMESPACE::fesetround(FE_DOWNWARD);
  36   EXPECT_EQ(s, 0);
  37   rm = LIBC_NAMESPACE::fegetround();
  38   EXPECT_EQ(rm, FE_DOWNWARD);
  39
  40   s = LIBC_NAMESPACE::fesetround(FE_TOWARDZERO);
  41   EXPECT_EQ(s, 0);
  42   rm = LIBC_NAMESPACE::fegetround();
  43   EXPECT_EQ(rm, FE_TOWARDZERO);
  44 }