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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_fixdfdi
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6
   7 // Returns: convert a to a signed long long, rounding toward zero.
   8
   9 // Assumption: double is a IEEE 64 bit floating point type
  10 //             su_int is a 32 bit integral type
  11 //             value in double is representable in di_int (no range checking performed)
  12
  13 // seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
  14
  15 COMPILER_RT_ABI di_int __fixdfdi(double a);
  16
  17 int test__fixdfdi(double a, di_int expected)
  18 {
  19     di_int x = __fixdfdi(a);
  20     if (x != expected)
  21         printf("error in __fixdfdi(%A) = %llX, expected %llX\n", a, x, expected);
  22     return x != expected;
  23 }
  24
  25 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  26 char assumption_2[sizeof(su_int)*CHAR_BIT == 32] = {0};
  27 char assumption_3[sizeof(double)*CHAR_BIT == 64] = {0};
  28
  29 int main()
  30 {
  31     if (test__fixdfdi(0.0, 0))
  32         return 1;
  33
  34     if (test__fixdfdi(0.5, 0))
  35         return 1;
  36     if (test__fixdfdi(0.99, 0))
  37         return 1;
  38     if (test__fixdfdi(1.0, 1))
  39         return 1;
  40     if (test__fixdfdi(1.5, 1))
  41         return 1;
  42     if (test__fixdfdi(1.99, 1))
  43         return 1;
  44     if (test__fixdfdi(2.0, 2))
  45         return 1;
  46     if (test__fixdfdi(2.01, 2))
  47         return 1;
  48     if (test__fixdfdi(-0.5, 0))
  49         return 1;
  50     if (test__fixdfdi(-0.99, 0))
  51         return 1;
  52     if (test__fixdfdi(-1.0, -1))
  53         return 1;
  54     if (test__fixdfdi(-1.5, -1))
  55         return 1;
  56     if (test__fixdfdi(-1.99, -1))
  57         return 1;
  58     if (test__fixdfdi(-2.0, -2))
  59         return 1;
  60     if (test__fixdfdi(-2.01, -2))
  61         return 1;
  62
  63     if (test__fixdfdi(0x1.FFFFFEp+62, 0x7FFFFF8000000000LL))
  64         return 1;
  65     if (test__fixdfdi(0x1.FFFFFCp+62, 0x7FFFFF0000000000LL))
  66         return 1;
  67
  68     if (test__fixdfdi(-0x1.FFFFFEp+62, 0x8000008000000000LL))
  69         return 1;
  70     if (test__fixdfdi(-0x1.FFFFFCp+62, 0x8000010000000000LL))
  71         return 1;
  72
  73     if (test__fixdfdi(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFFFFFFFC00LL))
  74         return 1;
  75     if (test__fixdfdi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800LL))
  76         return 1;
  77
  78     if (test__fixdfdi(-0x1.FFFFFFFFFFFFFp+62, 0x8000000000000400LL))
  79         return 1;
  80     if (test__fixdfdi(-0x1.FFFFFFFFFFFFEp+62, 0x8000000000000800LL))
  81         return 1;
  82
  83    return 0;
  84 }