54 lines · cpp
1//===-- fsqrt_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 fsqrt implementation.10///11//===----------------------------------------------------------------------===//12 13#include "src/math/fsqrt.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_t out;23 mpfr_init2(input, 53);24 mpfr_init2(out, 128);25 for (size_t i = 0; i < size / sizeof(double); ++i) {26 double x;27 std::memcpy(&x, data, sizeof(double));28 data += sizeof(double);29 30 // remove NaN, inf, and values outside the accepted range31 if (isnan(x) || isinf(x) || x < 0)32 continue;33 // signed zeros already tested in unit tests34 if (signbit(x) && x == 0.0)35 continue;36 37 mpfr_set_d(input, x, MPFR_RNDN);38 mpfr_sqrt(out, input, MPFR_RNDN);39 float to_compare = mpfr_get_flt(out, MPFR_RNDN);40 41 float result = LIBC_NAMESPACE::fsqrt(x);42 43 if (result != to_compare) {44 std::cout << std::hexfloat << "Failing input: " << x << std::endl;45 std::cout << std::hexfloat << "Failing output: " << result << std::endl;46 std::cout << std::hexfloat << "Expected: " << to_compare << std::endl;47 __builtin_trap();48 }49 }50 mpfr_clear(input);51 mpfr_clear(out);52 return 0;53}54