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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2
   3 #define SINGLE_PRECISION
   4 #include <fenv.h>
   5 #include <float.h>
   6 #include <limits.h>
   7 #include <math.h>
   8 #include <stdio.h>
   9 #include "fp_lib.h"
  10
  11 int test__compiler_rt_scalbnf(const char *mode, fp_t x, int y) {
  12 #if defined(__ve__)
  13   if (fpclassify(x) == FP_SUBNORMAL)
  14     return 0;
  15 #endif
  16   fp_t crt_value = __compiler_rt_scalbnf(x, y);
  17   fp_t libm_value = scalbnf(x, y);
  18   // Consider +/-0 unequal, but disregard the sign/payload of NaN.
  19   if (toRep(crt_value) != toRep(libm_value) &&
  20       !(crt_isnan(crt_value) && crt_isnan(libm_value))) {
  21     printf("error: [%s] in __compiler_rt_scalbnf(%a [%X], %d) = %a [%X] "
  22            "!= %a [%X]\n",
  23            mode, x, toRep(x), y, crt_value, toRep(crt_value),
  24            libm_value, toRep(libm_value));
  25     return 1;
  26   }
  27   return 0;
  28 }
  29
  30 fp_t cases[] = {
  31   -NAN, NAN, -INFINITY, INFINITY, -0.0, 0.0, -1, 1, -2, 2,
  32   FLT_TRUE_MIN, FLT_TRUE_MIN*7, FLT_MIN, FLT_MAX,
  33   -1.001, 1.001, -1.002, 1.002, 1.e-6, -1.e-6,
  34   0x1.0p-125,
  35   0x1.0p-126,
  36   0x1.0p-127, // subnormal
  37   0x1.0p-128, // subnormal
  38 };
  39
  40 int iterate_cases(const char *mode) {
  41   const unsigned N = sizeof(cases) / sizeof(cases[0]);
  42   unsigned i;
  43   for (i = 0; i < N; ++i) {
  44     int j;
  45     for (j = -5; j <= 5; ++j) {
  46       if (test__compiler_rt_scalbnf(mode, cases[i], j)) return 1;
  47     }
  48     if (test__compiler_rt_scalbnf(mode, cases[i], -1000)) return 1;
  49     if (test__compiler_rt_scalbnf(mode, cases[i], 1000)) return 1;
  50     if (test__compiler_rt_scalbnf(mode, cases[i], INT_MIN)) return 1;
  51     if (test__compiler_rt_scalbnf(mode, cases[i], INT_MAX)) return 1;
  52   }
  53   return 0;
  54 }
  55
  56 int main() {
  57   if (iterate_cases("default")) return 1;
  58
  59   // Rounding mode tests on supported architectures. __compiler_rt_scalbnf
  60   // should have the same rounding behavior as single-precision multiplication.
  61 #if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP) || \
  62     defined(__i386__) || defined(__x86_64__)
  63 // Skip these tests on Windows because the UCRT scalbnf function always behaves
  64 // as if the default rounding mode is set (FE_TONEAREST).
  65 // Also skip for newlib because although its scalbnf function does respect the
  66 // rounding mode, where the tests trigger an underflow or overflow using a
  67 // large exponent the result is rounded in the opposite direction to that which
  68 // would be expected in the (FE_UPWARD) and (FE_DOWNWARD) modes.
  69 #  if !defined(_WIN32) && !defined(_NEWLIB_VERSION)
  70   fesetround(FE_UPWARD);
  71   if (iterate_cases("FE_UPWARD")) return 1;
  72
  73   fesetround(FE_DOWNWARD);
  74   if (iterate_cases("FE_DOWNWARD")) return 1;
  75
  76   fesetround(FE_TOWARDZERO);
  77   if (iterate_cases("FE_TOWARDZERO")) return 1;
  78 #endif
  79
  80   fesetround(FE_TONEAREST);
  81   if (iterate_cases("FE_TONEAREST")) return 1;
  82 #endif
  83
  84   return 0;
  85 }