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

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 //
   3 // Bug 42496
   4 // XFAIL: sparcv9-target-arch
   5 //
   6 //===-- compiler_rt_logbl_test.c - Test __compiler_rt_logbl ---------------===//
   7 //
   8 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   9 // See https://llvm.org/LICENSE.txt for license information.
  10 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  11 //
  12 //===----------------------------------------------------------------------===//
  13 //
  14 // This file checks __compiler_rt_logbl from the compiler_rt library for
  15 // conformance against libm.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #define QUAD_PRECISION
  20 #include <math.h>
  21 #include <stdio.h>
  22 #include "fp_lib.h"
  23 #include "int_lib.h"
  24
  25 #if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
  26
  27 int test__compiler_rt_logbl(fp_t x) {
  28   fp_t crt_value = __compiler_rt_logbl(x);
  29   fp_t libm_value = logbl(x);
  30   // Compare actual rep, e.g. to avoid NaN != the same NaN
  31   if (toRep(crt_value) != toRep(libm_value)) {
  32     // Split expected values into two for printf
  33     twords x_t, crt_value_t, libm_value_t;
  34     x_t.all = toRep(x);
  35     crt_value_t.all = toRep(crt_value);
  36     libm_value_t.all = toRep(libm_value);
  37     printf(
  38         "error: in __compiler_rt_logb(%a [%llX %llX]) = %a [%llX %llX] !=  %a "
  39         "[%llX %llX]\n",
  40         x, x_t.s.high, x_t.s.low, crt_value, crt_value_t.s.high,
  41         crt_value_t.s.low, libm_value, libm_value_t.s.high, libm_value_t.s.low);
  42     return 1;
  43   }
  44   return 0;
  45 }
  46
  47 double cases[] = {
  48     1.e-6, -1.e-6, NAN, -NAN, INFINITY, -INFINITY, -1,
  49     -0.0,  0.0,    1,   -2,   2,        -0.5,      0.5,
  50 };
  51
  52 #endif
  53
  54 int main() {
  55 #if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
  56   const unsigned N = sizeof(cases) / sizeof(cases[0]);
  57   unsigned i;
  58   for (i = 0; i < N; ++i) {
  59     if (test__compiler_rt_logbl(cases[i])) return 1;
  60   }
  61
  62   // Test a moving 1 bit, especially to handle denormal values.
  63   // Test the negation as well.
  64   rep_t x = signBit;
  65   while (x) {
  66     if (test__compiler_rt_logbl(fromRep(x))) return 1;
  67     if (test__compiler_rt_logbl(fromRep(signBit ^ x))) return 1;
  68     x >>= 1;
  69   }
  70   // Also try a couple moving ones
  71   x = signBit | (signBit >> 1) | (signBit >> 2);
  72   while (x) {
  73     if (test__compiler_rt_logbl(fromRep(x))) return 1;
  74     if (test__compiler_rt_logbl(fromRep(signBit ^ x))) return 1;
  75     x >>= 1;
  76   }
  77 #else
  78   printf("skipped\n");
  79 #endif
  80
  81   return 0;
  82 }