From 8e2115b33ee9435c2db19c0b3ed0e7d68f393ac9 Mon Sep 17 00:00:00 2001 From: Sriya Pratipati Date: Wed, 9 Jul 2025 22:39:29 +0000 Subject: [PATCH 1/2] [libc] Fuzz tests for acos and atan created fuzz tests for acos and atan --- libc/fuzzing/math/CMakeLists.txt | 18 +++++++++++++++ libc/fuzzing/math/acos_fuzz.cpp | 39 ++++++++++++++++++++++++++++++++ libc/fuzzing/math/atan_fuzz.cpp | 39 ++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+) create mode 100644 libc/fuzzing/math/acos_fuzz.cpp create mode 100644 libc/fuzzing/math/atan_fuzz.cpp diff --git a/libc/fuzzing/math/CMakeLists.txt b/libc/fuzzing/math/CMakeLists.txt index 31336fa3e49f3..bb0da15d034b2 100644 --- a/libc/fuzzing/math/CMakeLists.txt +++ b/libc/fuzzing/math/CMakeLists.txt @@ -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 diff --git a/libc/fuzzing/math/acos_fuzz.cpp b/libc/fuzzing/math/acos_fuzz.cpp new file mode 100644 index 0000000000000..4846b656e8223 --- /dev/null +++ b/libc/fuzzing/math/acos_fuzz.cpp @@ -0,0 +1,39 @@ +//===-- 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 + +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; +} + diff --git a/libc/fuzzing/math/atan_fuzz.cpp b/libc/fuzzing/math/atan_fuzz.cpp new file mode 100644 index 0000000000000..c6863fbccfd0d --- /dev/null +++ b/libc/fuzzing/math/atan_fuzz.cpp @@ -0,0 +1,39 @@ +//===-- 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 + +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; +} + From 287f078b391205ee336f39ce47b5f5ab760bf547 Mon Sep 17 00:00:00 2001 From: Sriya Pratipati Date: Wed, 9 Jul 2025 23:28:55 +0000 Subject: [PATCH 2/2] fixed formatting --- libc/fuzzing/math/acos_fuzz.cpp | 1 - libc/fuzzing/math/atan_fuzz.cpp | 1 - 2 files changed, 2 deletions(-) diff --git a/libc/fuzzing/math/acos_fuzz.cpp b/libc/fuzzing/math/acos_fuzz.cpp index 4846b656e8223..d2b5456026839 100644 --- a/libc/fuzzing/math/acos_fuzz.cpp +++ b/libc/fuzzing/math/acos_fuzz.cpp @@ -36,4 +36,3 @@ extern "C" int LLVMFuzzerTestOneInput(double x) { mpfr_clear(input); return 0; } - diff --git a/libc/fuzzing/math/atan_fuzz.cpp b/libc/fuzzing/math/atan_fuzz.cpp index c6863fbccfd0d..3b485786e3a63 100644 --- a/libc/fuzzing/math/atan_fuzz.cpp +++ b/libc/fuzzing/math/atan_fuzz.cpp @@ -36,4 +36,3 @@ extern "C" int LLVMFuzzerTestOneInput(double x) { mpfr_clear(input); return 0; } -