compiler-rt/test/builtins/Unit/divdf3_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_divdf3
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6
   7 #include "fp_test.h"
   8
   9 // Returns: a / b
  10 COMPILER_RT_ABI double __divdf3(double a, double b);
  11
  12 int test__divdf3(double a, double b, uint64_t expected)
  13 {
  14     double x = __divdf3(a, b);
  15     int ret = compareResultD(x, expected);
  16
  17     if (ret){
  18         printf("error in test__divdf3(%.20e, %.20e) = %.20e, "
  19                "expected %.20e\n", a, b, x,
  20                fromRep64(expected));
  21     }
  22     return ret;
  23 }
  24
  25 int main()
  26 {
  27     // Returned NaNs are assumed to be qNaN by default
  28
  29     // qNaN / any = qNaN
  30     if (test__divdf3(makeQNaN64(), 3., UINT64_C(0x7ff8000000000000)))
  31       return 1;
  32     // NaN / any = NaN
  33     if (test__divdf3(makeNaN64(UINT64_C(0x123)), 3., UINT64_C(0x7ff8000000000000)))
  34       return 1;
  35     // any / qNaN = qNaN
  36     if (test__divdf3(3., makeQNaN64(), UINT64_C(0x7ff8000000000000)))
  37       return 1;
  38     // any / NaN = NaN
  39     if (test__divdf3(3., makeNaN64(UINT64_C(0x123)), UINT64_C(0x7ff8000000000000)))
  40       return 1;
  41
  42     // +Inf / positive = +Inf
  43     if (test__divdf3(makeInf64(), 3., UINT64_C(0x7ff0000000000000)))
  44       return 1;
  45     // +Inf / negative = -Inf
  46     if (test__divdf3(makeInf64(), -3., UINT64_C(0xfff0000000000000)))
  47       return 1;
  48     // -Inf / positive = -Inf
  49     if (test__divdf3(makeNegativeInf64(), 3., UINT64_C(0xfff0000000000000)))
  50       return 1;
  51     // -Inf / negative = +Inf
  52     if (test__divdf3(makeNegativeInf64(), -3., UINT64_C(0x7ff0000000000000)))
  53       return 1;
  54
  55     // Inf / Inf = NaN
  56     if (test__divdf3(makeInf64(), makeInf64(), UINT64_C(0x7ff8000000000000)))
  57       return 1;
  58     // 0.0 / 0.0 = NaN
  59     if (test__divdf3(+0x0.0p+0, +0x0.0p+0, UINT64_C(0x7ff8000000000000)))
  60       return 1;
  61     // +0.0 / +Inf = +0.0
  62     if (test__divdf3(+0x0.0p+0, makeInf64(), UINT64_C(0x0)))
  63       return 1;
  64     // +Inf / +0.0 = +Inf
  65     if (test__divdf3(makeInf64(), +0x0.0p+0, UINT64_C(0x7ff0000000000000)))
  66       return 1;
  67
  68     // positive / +0.0 = +Inf
  69     if (test__divdf3(+1.0, +0x0.0p+0, UINT64_C(0x7ff0000000000000)))
  70       return 1;
  71     // positive / -0.0 = -Inf
  72     if (test__divdf3(+1.0, -0x0.0p+0, UINT64_C(0xfff0000000000000)))
  73       return 1;
  74     // negative / +0.0 = -Inf
  75     if (test__divdf3(-1.0, +0x0.0p+0, UINT64_C(0xfff0000000000000)))
  76       return 1;
  77     // negative / -0.0 = +Inf
  78     if (test__divdf3(-1.0, -0x0.0p+0, UINT64_C(0x7ff0000000000000)))
  79       return 1;
  80
  81     // 1/3
  82     if (test__divdf3(1., 3., UINT64_C(0x3fd5555555555555)))
  83       return 1;
  84     // smallest normal result
  85     if (test__divdf3(0x1.0p-1021, 2., UINT64_C(0x10000000000000)))
  86       return 1;
  87
  88     // divisor is exactly 1.0
  89     if (test__divdf3(0x1.0p+0, 0x1.0p+0, UINT64_C(0x3ff0000000000000)))
  90       return 1;
  91     // divisor is truncated to exactly 1.0 in UQ1.31
  92     if (test__divdf3(0x1.0p+0, 0x1.00000001p+0, UINT64_C(0x3fefffffffe00000)))
  93       return 1;
  94
  95     // smallest normal value divided by 2.0
  96     if (test__divdf3(0x1.0p-1022, 2., UINT64_C(0x0008000000000000)))
  97       return 1;
  98     // smallest subnormal result
  99     if (test__divdf3(0x1.0p-1022, 0x1.0p+52, UINT64_C(0x0000000000000001)))
 100       return 1;
 101
 102     // some misc test cases obtained by fuzzing against h/w implementation
 103     if (test__divdf3(0x1.fdc239dd64735p-658, -0x1.fff9364c0843fp-948, UINT64_C(0xd20fdc8fc0ceffb1)))
 104       return 1;
 105     if (test__divdf3(-0x1.78abb261d47c8p+794, 0x1.fb01d537cc5aep+266, UINT64_C(0xe0e7c6148ffc23e3)))
 106       return 1;
 107     if (test__divdf3(-0x1.da7dfe6048b8bp-875, 0x1.ffc7ea3ff60a4p-610, UINT64_C(0xaf5dab1fe0269e2a)))
 108       return 1;
 109     if (test__divdf3(0x1.0p-1022, 0x1.9p+5, UINT64_C(0x000051eb851eb852)))
 110       return 1;
 111     if (test__divdf3(0x1.0p-1022, 0x1.0028p+41, UINT64_C(0x00000000000007ff)))
 112       return 1;
 113     if (test__divdf3(0x1.0p-1022, 0x1.0028p+52, UINT64_C(0x1)))
 114       return 1;
 115
 116     // test 1 / (1 - eps(0.5)) = 1 + eps(1)
 117     if (test__divdf3(1.0, 0x1.fffffffffffffp-1, UINT64_C(0x3ff0000000000001)))
 118       return 1;
 119
 120     return 0;
 121 }