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