test/Unit/fixdfdi_test.c

   1 //===-- fixdfdi_test.c - Test __fixdfdi -----------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file tests __fixdfdi for the compiler_rt library.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "int_lib.h"
  15 #include <stdio.h>
  16
  17 // Returns: convert a to a signed long long, rounding toward zero.
  18
  19 // Assumption: double is a IEEE 64 bit floating point type
  20 //             su_int is a 32 bit integral type
  21 //             value in double is representable in di_int (no range checking performed)
  22
  23 // seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
  24
  25 di_int __fixdfdi(double a);
  26
  27 int test__fixdfdi(double a, di_int expected)
  28 {
  29     di_int x = __fixdfdi(a);
  30     if (x != expected)
  31         printf("error in __fixdfdi(%A) = %llX, expected %llX\n", a, x, expected);
  32     return x != expected;
  33 }
  34
  35 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  36 char assumption_2[sizeof(su_int)*CHAR_BIT == 32] = {0};
  37 char assumption_3[sizeof(double)*CHAR_BIT == 64] = {0};
  38
  39 int main()
  40 {
  41     if (test__fixdfdi(0.0, 0))
  42         return 1;
  43
  44     if (test__fixdfdi(0.5, 0))
  45         return 1;
  46     if (test__fixdfdi(0.99, 0))
  47         return 1;
  48     if (test__fixdfdi(1.0, 1))
  49         return 1;
  50     if (test__fixdfdi(1.5, 1))
  51         return 1;
  52     if (test__fixdfdi(1.99, 1))
  53         return 1;
  54     if (test__fixdfdi(2.0, 2))
  55         return 1;
  56     if (test__fixdfdi(2.01, 2))
  57         return 1;
  58     if (test__fixdfdi(-0.5, 0))
  59         return 1;
  60     if (test__fixdfdi(-0.99, 0))
  61         return 1;
  62     if (test__fixdfdi(-1.0, -1))
  63         return 1;
  64     if (test__fixdfdi(-1.5, -1))
  65         return 1;
  66     if (test__fixdfdi(-1.99, -1))
  67         return 1;
  68     if (test__fixdfdi(-2.0, -2))
  69         return 1;
  70     if (test__fixdfdi(-2.01, -2))
  71         return 1;
  72
  73     if (test__fixdfdi(0x1.FFFFFEp+62, 0x7FFFFF8000000000LL))
  74         return 1;
  75     if (test__fixdfdi(0x1.FFFFFCp+62, 0x7FFFFF0000000000LL))
  76         return 1;
  77
  78     if (test__fixdfdi(-0x1.FFFFFEp+62, 0x8000008000000000LL))
  79         return 1;
  80     if (test__fixdfdi(-0x1.FFFFFCp+62, 0x8000010000000000LL))
  81         return 1;
  82
  83     if (test__fixdfdi(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFFFFFFFC00LL))
  84         return 1;
  85     if (test__fixdfdi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800LL))
  86         return 1;
  87
  88     if (test__fixdfdi(-0x1.FFFFFFFFFFFFFp+62, 0x8000000000000400LL))
  89         return 1;
  90     if (test__fixdfdi(-0x1.FFFFFFFFFFFFEp+62, 0x8000000000000800LL))
  91         return 1;
  92
  93    return 0;
  94 }