| //===-- tan_fuzz.cpp ------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// Fuzzing test for llvm-libc tan implementation. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/math/tan.h" |
| #include "utils/MPFRWrapper/mpfr_inc.h" |
| #include <math.h> |
| |
| extern "C" int LLVMFuzzerTestOneInput(const double x) { |
| // remove NaN and inf as preconditions |
| if (isnan(x)) |
| return 0; |
| if (isinf(x)) |
| return 0; |
| // signed zeros already tested in unit tests |
| if (signbit(x) && x == 0.0) |
| return 0; |
| mpfr_t input; |
| mpfr_init2(input, 53); |
| mpfr_set_d(input, x, MPFR_RNDN); |
| int output = mpfr_tan(input, input, MPFR_RNDN); |
| mpfr_subnormalize(input, output, MPFR_RNDN); |
| double to_compare = mpfr_get_d(input, MPFR_RNDN); |
| |
| double result = LIBC_NAMESPACE::tan(x); |
| |
| if (result != to_compare) |
| __builtin_trap(); |
| |
| mpfr_clear(input); |
| return 0; |
| } |