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[libc] Fuzz tests for acos and atan (#147843)

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created fuzz tests for acos and atan

---------

Co-authored-by: Sriya Pratipati <sriyap@google.com>
This commit is contained in:
sribee8 2025-07-10 16:28:29 +00:00 committed by GitHub
parent f60cc63e8c
commit a9d8843d71
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3 changed files with 94 additions and 0 deletions
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18
libc/fuzzing/math/CMakeLists.txt
View File

@ -71,6 +71,15 @@ add_libc_fuzzer(
libc.src.math.sin
)
add_libc_fuzzer(
acos_fuzz
NEED_MPFR
SRCS
acos_fuzz.cpp
DEPENDS
libc.src.math.acos
)
add_libc_fuzzer(
cos_fuzz
NEED_MPFR
@ -80,6 +89,15 @@ add_libc_fuzzer(
libc.src.math.cos
)
add_libc_fuzzer(
atan_fuzz
NEED_MPFR
SRCS
atan_fuzz.cpp
DEPENDS
libc.src.math.atan
)
add_libc_fuzzer(
tan_fuzz
NEED_MPFR

38
libc/fuzzing/math/acos_fuzz.cpp Normal file
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@ -0,0 +1,38 @@
//===-- acos_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 acos implementation.
///
//===----------------------------------------------------------------------===//
#include "src/math/acos.h"
#include "utils/MPFRWrapper/mpfr_inc.h"
#include <math.h>
extern "C" int LLVMFuzzerTestOneInput(double x) {
// remove NaN and inf and values outside accepted range
if (isnan(x) || isinf(x) || x > 1 || x < -1)
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_acos(input, input, MPFR_RNDN);
mpfr_subnormalize(input, output, MPFR_RNDN);
double to_compare = mpfr_get_d(input, MPFR_RNDN);
double result = LIBC_NAMESPACE::acos(x);
if (result != to_compare)
__builtin_trap();
mpfr_clear(input);
return 0;
}

38
libc/fuzzing/math/atan_fuzz.cpp Normal file
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@ -0,0 +1,38 @@
//===-- atan_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 atan implementation.
///
//===----------------------------------------------------------------------===//
#include "src/math/atan.h"
#include "utils/MPFRWrapper/mpfr_inc.h"
#include <math.h>
extern "C" int LLVMFuzzerTestOneInput(double x) {
// remove NaN and inf
if (isnan(x) || 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_atan(input, input, MPFR_RNDN);
mpfr_subnormalize(input, output, MPFR_RNDN);
double to_compare = mpfr_get_d(input, MPFR_RNDN);
double result = LIBC_NAMESPACE::atan(x);
if (result != to_compare)
__builtin_trap();
mpfr_clear(input);
return 0;
}