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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_floatundisf
   3
   4 #include "int_lib.h"
   5 #include <float.h>
   6 #include <stdio.h>
   7
   8 // Returns: convert a to a float, rounding toward even.
   9
  10 // Assumption: float is a IEEE 32 bit floating point type
  11 //             du_int is a 64 bit integral type
  12
  13 // seee eeee emmm mmmm mmmm mmmm mmmm mmmm
  14
  15 COMPILER_RT_ABI float __floatundisf(du_int a);
  16
  17 int test__floatundisf(du_int a, float expected)
  18 {
  19     float x = __floatundisf(a);
  20     if (x != expected)
  21         printf("error in __floatundisf(%llX) = %a, expected %a\n",
  22                a, x, expected);
  23     return x != expected;
  24 }
  25
  26 char assumption_1[sizeof(du_int) == 2*sizeof(si_int)] = {0};
  27 char assumption_2[sizeof(du_int)*CHAR_BIT == 64] = {0};
  28 char assumption_3[sizeof(float)*CHAR_BIT == 32] = {0};
  29
  30 int main()
  31 {
  32     if (test__floatundisf(0, 0.0F))
  33         return 1;
  34
  35     if (test__floatundisf(1, 1.0F))
  36         return 1;
  37     if (test__floatundisf(2, 2.0F))
  38         return 1;
  39
  40     if (test__floatundisf(0x7FFFFF8000000000ULL, 0x1.FFFFFEp+62F))
  41         return 1;
  42     if (test__floatundisf(0x7FFFFF0000000000ULL, 0x1.FFFFFCp+62F))
  43         return 1;
  44
  45     if (test__floatundisf(0x8000008000000000ULL, 0x1p+63F))
  46         return 1;
  47     if (test__floatundisf(0x8000010000000000LL, 0x1.000002p+63F))
  48         return 1;
  49
  50     if (test__floatundisf(0x8000000000000000LL, 0x1p+63F))
  51         return 1;
  52     if (test__floatundisf(0x8000000000000001LL, 0x1p+63F))
  53         return 1;
  54
  55     if (test__floatundisf(0xFFFFFFFFFFFFFFFELL, 0x1p+64F))
  56         return 1;
  57     if (test__floatundisf(0xFFFFFFFFFFFFFFFFLL, 0x1p+64F))
  58         return 1;
  59
  60     if (test__floatundisf(0x0007FB72E8000000LL, 0x1.FEDCBAp+50F))
  61         return 1;
  62
  63     if (test__floatundisf(0x0007FB72EA000000LL, 0x1.FEDCBAp+50F))
  64         return 1;
  65     if (test__floatundisf(0x0007FB72EB000000LL, 0x1.FEDCBAp+50F))
  66         return 1;
  67     if (test__floatundisf(0x0007FB72EBFFFFFFLL, 0x1.FEDCBAp+50F))
  68         return 1;
  69     if (test__floatundisf(0x0007FB72EC000000LL, 0x1.FEDCBCp+50F))
  70         return 1;
  71     if (test__floatundisf(0x0007FB72E8000001LL, 0x1.FEDCBAp+50F))
  72         return 1;
  73
  74     if (test__floatundisf(0x0007FB72E6000000LL, 0x1.FEDCBAp+50F))
  75         return 1;
  76     if (test__floatundisf(0x0007FB72E7000000LL, 0x1.FEDCBAp+50F))
  77         return 1;
  78     if (test__floatundisf(0x0007FB72E7FFFFFFLL, 0x1.FEDCBAp+50F))
  79         return 1;
  80     if (test__floatundisf(0x0007FB72E4000001LL, 0x1.FEDCBAp+50F))
  81         return 1;
  82     if (test__floatundisf(0x0007FB72E4000000LL, 0x1.FEDCB8p+50F))
  83         return 1;
  84
  85    return 0;
  86 }