[libc] cbrt fuzz test #150063
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[libc] cbrt fuzz test #150063
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Implemented fuzz test for cbrt
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@llvm/pr-subscribers-libc Author: None (sribee8) ChangesImplemented fuzz test for cbrt Full diff: https://github.com/llvm/llvm-project/pull/150063.diff 2 Files Affected:
diff --git a/libc/fuzzing/math/CMakeLists.txt b/libc/fuzzing/math/CMakeLists.txt
index c1a93058764b3..be63fe4b65aea 100644
--- a/libc/fuzzing/math/CMakeLists.txt
+++ b/libc/fuzzing/math/CMakeLists.txt
@@ -196,3 +196,12 @@ add_libc_fuzzer(
DEPENDS
libc.src.__support.FPUtil.generic.sqrt
)
+
+add_libc_fuzzer(
+ cbrt_fuzz
+ NEED_MPFR
+ SRCS
+ cbrt_fuzz.cpp
+ DEPENDS
+ libc.src.math.cbrt
+)
diff --git a/libc/fuzzing/math/cbrt_fuzz.cpp b/libc/fuzzing/math/cbrt_fuzz.cpp
new file mode 100644
index 0000000000000..95f1df1695e56
--- /dev/null
+++ b/libc/fuzzing/math/cbrt_fuzz.cpp
@@ -0,0 +1,50 @@
+//===-- cbrt_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 cbrt implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/cbrt.h"
+#include "utils/MPFRWrapper/mpfr_inc.h"
+#include <cstdint>
+#include <cstring>
+#include <iostream>
+#include <math.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ mpfr_t input;
+ mpfr_init2(input, 53);
+ for (size_t i = 0; i < size / sizeof(double); ++i) {
+ double x;
+ std::memcpy(&x, data, sizeof(double));
+ data += sizeof(double);
+ // remove NaN and inf
+ if (isnan(x) || isinf(x))
+ continue;
+ // signed zeros already tested in unit tests
+ if (signbit(x) && x == 0.0)
+ continue;
+
+ mpfr_set_d(input, x, MPFR_RNDN);
+ int output = mpfr_cbrt(input, input, MPFR_RNDN);
+ mpfr_subnormalize(input, output, MPFR_RNDN);
+ double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+ double result = LIBC_NAMESPACE::cbrt(x);
+
+ if (result != to_compare) {
+ std::cout << std::hexfloat << "Failing input: " << x << std::endl;
+ std::cout << std::hexfloat << "Failing output: " << result << std::endl;
+ std::cout << std::hexfloat << "Expected: " << to_compare << std::endl;
+ __builtin_trap();
+ }
+ }
+ mpfr_clear(input);
+ return 0;
+}
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lntue
approved these changes
Jul 22, 2025
|
LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/38990 Here is the relevant piece of the build log for the reference |
mahesh-attarde
pushed a commit
to mahesh-attarde/llvm-project
that referenced
this pull request
Jul 28, 2025
Implemented fuzz test for cbrt Co-authored-by: Sriya Pratipati <[email protected]>
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Implemented fuzz test for cbrt