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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_fixdfdi
   3 //===-- fixdfdi_test.c - Test __fixdfdi -----------------------------------===//
   4 //
   5 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6 // See https://llvm.org/LICENSE.txt for license information.
   7 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8 //
   9 //===----------------------------------------------------------------------===//
  10 //
  11 // This file tests __fixdfdi for the compiler_rt library.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "int_lib.h"
  16 #include <stdio.h>
  17
  18 // Returns: convert a to a signed long long, rounding toward zero.
  19
  20 // Assumption: double is a IEEE 64 bit floating point type
  21 //             su_int is a 32 bit integral type
  22 //             value in double is representable in di_int (no range checking performed)
  23
  24 // seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
  25
  26 COMPILER_RT_ABI di_int __fixdfdi(double a);
  27
  28 int test__fixdfdi(double a, di_int expected)
  29 {
  30     di_int x = __fixdfdi(a);
  31     if (x != expected)
  32         printf("error in __fixdfdi(%A) = %llX, expected %llX\n", a, x, expected);
  33     return x != expected;
  34 }
  35
  36 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  37 char assumption_2[sizeof(su_int)*CHAR_BIT == 32] = {0};
  38 char assumption_3[sizeof(double)*CHAR_BIT == 64] = {0};
  39
  40 int main()
  41 {
  42     if (test__fixdfdi(0.0, 0))
  43         return 1;
  44
  45     if (test__fixdfdi(0.5, 0))
  46         return 1;
  47     if (test__fixdfdi(0.99, 0))
  48         return 1;
  49     if (test__fixdfdi(1.0, 1))
  50         return 1;
  51     if (test__fixdfdi(1.5, 1))
  52         return 1;
  53     if (test__fixdfdi(1.99, 1))
  54         return 1;
  55     if (test__fixdfdi(2.0, 2))
  56         return 1;
  57     if (test__fixdfdi(2.01, 2))
  58         return 1;
  59     if (test__fixdfdi(-0.5, 0))
  60         return 1;
  61     if (test__fixdfdi(-0.99, 0))
  62         return 1;
  63     if (test__fixdfdi(-1.0, -1))
  64         return 1;
  65     if (test__fixdfdi(-1.5, -1))
  66         return 1;
  67     if (test__fixdfdi(-1.99, -1))
  68         return 1;
  69     if (test__fixdfdi(-2.0, -2))
  70         return 1;
  71     if (test__fixdfdi(-2.01, -2))
  72         return 1;
  73
  74     if (test__fixdfdi(0x1.FFFFFEp+62, 0x7FFFFF8000000000LL))
  75         return 1;
  76     if (test__fixdfdi(0x1.FFFFFCp+62, 0x7FFFFF0000000000LL))
  77         return 1;
  78
  79     if (test__fixdfdi(-0x1.FFFFFEp+62, 0x8000008000000000LL))
  80         return 1;
  81     if (test__fixdfdi(-0x1.FFFFFCp+62, 0x8000010000000000LL))
  82         return 1;
  83
  84     if (test__fixdfdi(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFFFFFFFC00LL))
  85         return 1;
  86     if (test__fixdfdi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800LL))
  87         return 1;
  88
  89     if (test__fixdfdi(-0x1.FFFFFFFFFFFFFp+62, 0x8000000000000400LL))
  90         return 1;
  91     if (test__fixdfdi(-0x1.FFFFFFFFFFFFEp+62, 0x8000000000000800LL))
  92         return 1;
  93
  94    return 0;
  95 }