56 lines · cpp
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-exception6//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 <cstdint>16#include <cstring>17#include <iostream>18#include <math.h>19 20extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {21 mpfr_t input;22 mpfr_init2(input, 53);23 for (size_t i = 0; i < size / sizeof(double); ++i) {24 double x;25 std::memcpy(&x, data, sizeof(double));26 data += sizeof(double);27 28 // remove NaN and inf as preconditions29 if (isnan(x))30 continue;31 if (isinf(x))32 continue;33 34 // signed zeros already tested in unit tests35 if (signbit(x) && x == 0.0)36 continue;37 38 mpfr_set_d(input, x, MPFR_RNDN);39 int output = mpfr_cos(input, input, MPFR_RNDN);40 mpfr_subnormalize(input, output, MPFR_RNDN);41 double to_compare = mpfr_get_d(input, MPFR_RNDN);42 43 double result = LIBC_NAMESPACE::cos(x);44 45 if (result != to_compare) {46 std::cout << std::hexfloat << "Failing input: " << x << std::endl;47 std::cout << std::hexfloat << "Failing output: " << result << std::endl;48 std::cout << std::hexfloat << "Expected: " << to_compare << std::endl;49 __builtin_trap();50 }51 }52 53 mpfr_clear(input);54 return 0;55}56