1 //===-- cos_fuzz.cpp ------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// Fuzzing test for llvm-libc cos implementation. 10 /// 11 //===----------------------------------------------------------------------===// 12 13 #include "src/math/cos.h" 14 #include "utils/MPFRWrapper/mpfr_inc.h" 15 #include <math.h> 16 17 extern "C" int LLVMFuzzerTestOneInput(const double x) { 18 // remove NaN and inf as preconditions 19 if (isnan(x)) 20 return 0; 21 if (isinf(x)) 22 return 0; 23 // signed zeros already tested in unit tests 24 if (signbit(x) && x == 0.0) 25 return 0; 26 mpfr_t input; 27 mpfr_init2(input, 53); 28 mpfr_set_d(input, x, MPFR_RNDN); 29 int output = mpfr_cos(input, input, MPFR_RNDN); 30 mpfr_subnormalize(input, output, MPFR_RNDN); 31 double to_compare = mpfr_get_d(input, MPFR_RNDN); 32 33 double result = LIBC_NAMESPACE::cos(x); 34 35 if (result != to_compare) 36 __builtin_trap(); 37 38 mpfr_clear(input); 39 return 0; 40 } 41