compiler-rt/test/builtins/Unit/compiler_rt_scalbnl_test.c

// RUN: %clang_builtins %s %librt -o %t && %run %t

#define QUAD_PRECISION
#include <fenv.h>
#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include "fp_lib.h"

#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)

int test__compiler_rt_scalbnl(const char *mode, fp_t x, int y) {
#if defined(__ve__)
  if (fpclassify(x) == FP_SUBNORMAL)
    return 0;
#endif
  fp_t crt_value = __compiler_rt_scalbnl(x, y);
  fp_t libm_value = scalbnl(x, y);
  // Consider +/-0 unequal, but disregard the sign/payload of NaN.
  if (toRep(crt_value) != toRep(libm_value) &&
      !(crt_isnan(crt_value) && crt_isnan(libm_value))) {
    // Split expected values into two for printf
    twords x_t, crt_value_t, libm_value_t;
    x_t.all = toRep(x);
    crt_value_t.all = toRep(crt_value);
    libm_value_t.all = toRep(libm_value);
    printf(
        "error: [%s] in __compiler_rt_scalbnl([%llX %llX], %d) = "
        "[%llX %llX] != [%llX %llX]\n",
        mode, (unsigned long long)x_t.s.high, (unsigned long long)x_t.s.low, y,
        (unsigned long long)crt_value_t.s.high,
        (unsigned long long)crt_value_t.s.low,
        (unsigned long long)libm_value_t.s.high,
        (unsigned long long)libm_value_t.s.low);
    return 1;
  }
  return 0;
}

fp_t cases[] = {
  -NAN, NAN, -INFINITY, INFINITY, -0.0, 0.0, -1, 1, -2, 2,
  LDBL_TRUE_MIN, LDBL_MIN, LDBL_MAX,
  -1.001, 1.001, -1.002, 1.002, 1.e-6, -1.e-6,
  0x1.0p-16381L,
  0x1.0p-16382L,
  0x1.0p-16383L, // subnormal
  0x1.0p-16384L, // subnormal
};

int iterate_cases(const char *mode) {
  const unsigned N = sizeof(cases) / sizeof(cases[0]);
  unsigned i;
  for (i = 0; i < N; ++i) {
    int j;
    for (j = -5; j <= 5; ++j) {
      if (test__compiler_rt_scalbnl(mode, cases[i], j)) return 1;
    }
    if (test__compiler_rt_scalbnl(mode, cases[i], -100000)) return 1;
    if (test__compiler_rt_scalbnl(mode, cases[i], 100000)) return 1;
    if (test__compiler_rt_scalbnl(mode, cases[i], INT_MIN)) return 1;
    if (test__compiler_rt_scalbnl(mode, cases[i], INT_MAX)) return 1;
  }
  return 0;
}

#endif

int main() {
#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
  if (iterate_cases("default")) return 1;

  // Skip rounding mode tests (fesetround) because compiler-rt's quad-precision
  // multiply also ignores the current rounding mode.

#else
  printf("skipped\n");
#endif

  return 0;
}