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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2
   3 #define QUAD_PRECISION
   4 #include "fp_lib.h"
   5 #include "int_lib.h"
   6 #include <math.h>
   7 #include <stdio.h>
   8
   9 #if defined(CRT_HAS_TF_MODE)
  10
  11 int test__compiler_rt_logbl(fp_t x) {
  12 #  if defined(__ve__)
  13   if (fpclassify(x) == FP_SUBNORMAL)
  14     return 0;
  15 #  endif
  16   fp_t crt_value = __compiler_rt_logbl(x);
  17   fp_t libm_value = logbl(x);
  18   // Compare the values, considering all NaNs equivalent, as the spec doesn't
  19   // specify the NaN signedness/payload.
  20   if (crt_value != libm_value &&
  21       !(crt_isnan(crt_value) && crt_isnan(libm_value))) {
  22     // Split expected values into two for printf
  23     twords x_t, crt_value_t, libm_value_t;
  24     x_t.all = toRep(x);
  25     crt_value_t.all = toRep(crt_value);
  26     libm_value_t.all = toRep(libm_value);
  27     printf("error: in __compiler_rt_logbl([%llX %llX]) = [%llX %llX] !=  "
  28            "[%llX %llX]\n",
  29            x_t.s.high, x_t.s.low, crt_value_t.s.high, crt_value_t.s.low,
  30            libm_value_t.s.high, libm_value_t.s.low);
  31     return 1;
  32   }
  33   return 0;
  34 }
  35
  36 fp_t cases[] = {
  37     1.e-6, -1.e-6, NAN, -NAN, INFINITY, -INFINITY, -1,
  38     -0.0,  0.0,    1,   -2,   2,        -0.5,      0.5,
  39 };
  40
  41 int main() {
  42   const unsigned N = sizeof(cases) / sizeof(cases[0]);
  43   for (unsigned i = 0; i < N; ++i) {
  44     if (test__compiler_rt_logbl(cases[i]))
  45       return 1;
  46   }
  47
  48   // Test a moving 1 bit, especially to handle denormal values.
  49   // Test the negation as well.
  50   // Since we are comparing the compiler-rt IEEE implementation against libc's
  51   // long double implementation, this test can only succeed if long double
  52   // is an IEEE 128-bit floating point number (otherwise we will see mismatches
  53   // once we reach numbers that cannot be precisely represented in long double
  54   // format).
  55 #  if defined(CRT_LDBL_IEEE_F128)
  56   rep_t x = signBit;
  57   int i = 0;
  58   while (x) {
  59     if (test__compiler_rt_logbl(fromRep(x)))
  60       return 1;
  61     if (test__compiler_rt_logbl(fromRep(signBit ^ x)))
  62       return 1;
  63     x >>= 1;
  64     printf("l1: %d\n", i++);
  65   }
  66   // Also try a couple moving ones
  67   x = signBit | (signBit >> 1) | (signBit >> 2);
  68   while (x) {
  69     if (test__compiler_rt_logbl(fromRep(x)))
  70       return 1;
  71     if (test__compiler_rt_logbl(fromRep(signBit ^ x)))
  72       return 1;
  73     x >>= 1;
  74     printf("l1: %d\n", i++);
  75   }
  76 #endif
  77
  78   return 0;
  79 }
  80 #else
  81 int main() {
  82   printf("skipped\n");
  83   return 0;
  84 }
  85 #endif