text: // RUN: %clang_builtins %s %librt -o %t && %run %t
  //===--------------- subtf3_test.c - Test __subtf3 ------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // This file tests __subtf3 for the compiler_rt library.
  //
  //===----------------------------------------------------------------------===//
  
  #include <fenv.h>
  #include <stdio.h>
  
  #if __LDBL_MANT_DIG__ == 113
  
  #include "int_lib.h"
  #include "fp_test.h"
  
  // Returns: a - b
  COMPILER_RT_ABI long double __subtf3(long double a, long double b);
  
  int test__subtf3(long double a, long double b,
                   uint64_t expectedHi, uint64_t expectedLo)
  {
      long double x = __subtf3(a, b);
      int ret = compareResultLD(x, expectedHi, expectedLo);
  
      if (ret){
          printf("error in test__subtf3(%.20Lf, %.20Lf) = %.20Lf, "
                 "expected %.20Lf\n", a, b, x,
                 fromRep128(expectedHi, expectedLo));
      }
      return ret;
  }
  
  char assumption_1[sizeof(long double) * CHAR_BIT == 128] = {0};
  
  #endif
  
  int main()
  {
  #if __LDBL_MANT_DIG__ == 113
      // qNaN - any = qNaN
      if (test__subtf3(makeQNaN128(),
                       0x1.23456789abcdefp+5L,
                       UINT64_C(0x7fff800000000000),
                       UINT64_C(0x0)))
          return 1;
      // NaN - any = NaN
      if (test__subtf3(makeNaN128(UINT64_C(0x800030000000)),
                       0x1.23456789abcdefp+5L,
                       UINT64_C(0x7fff800000000000),
                       UINT64_C(0x0)))
          return 1;
      // inf - any = inf
      if (test__subtf3(makeInf128(),
                       0x1.23456789abcdefp+5L,
                       UINT64_C(0x7fff000000000000),
                       UINT64_C(0x0)))
          return 1;
      // any - any
      if (test__subtf3(0x1.234567829a3bcdef5678ade36734p+5L,
                       0x1.ee9d7c52354a6936ab8d7654321fp-1L,
                       UINT64_C(0x40041b8af1915166),
                       UINT64_C(0xa44a7bca780a166c)))
          return 1;
  
  #if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP)
      // Rounding mode tests on supported architectures
      long double m = 1234.0L, n = 0.01L;
      fesetround(FE_UPWARD);
      if (__subtf3(m, n) != 1234.0L)
          return 1;
  
      fesetround(FE_DOWNWARD);
      if (__subtf3(m, n) != 1233.0L)
          return 1;
  
      fesetround(FE_TOWARDZERO);
      if (__subtf3(m, n) != 1233.0L)
          return 1;
  
      fesetround(FE_TONEAREST);
      if (__subtf3(m, n) != 1234.0L)
          return 1;
  #endif
  
  #else
      printf("skipped\n");
  
  #endif
      return 0;
  }
  