[libc] Fuzz tests for fsqrt, f16sqrt, and hypot #150489
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added 2 commits
July 24, 2025 17:06
Added fuzz tests for f16sqrt, fsqrt, and hypot
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@llvm/pr-subscribers-libc Author: None (sribee8) ChangesAdded fuzz tests for f16sqrt, fsqrt, and hypot Full diff: https://github.com/llvm/llvm-project/pull/150489.diff 4 Files Affected:
diff --git a/libc/fuzzing/math/CMakeLists.txt b/libc/fuzzing/math/CMakeLists.txt
index be63fe4b65aea..19416fc5fdcf6 100644
--- a/libc/fuzzing/math/CMakeLists.txt
+++ b/libc/fuzzing/math/CMakeLists.txt
@@ -205,3 +205,30 @@ add_libc_fuzzer(
DEPENDS
libc.src.math.cbrt
)
+
+add_libc_fuzzer(
+ fsqrt_fuzz
+ NEED_MPFR
+ SRCS
+ fsqrt_fuzz.cpp
+ DEPENDS
+ libc.src.math.fsqrt
+)
+
+add_libc_fuzzer(
+ f16sqrt_fuzz
+ NEED_MPFR
+ SRCS
+ f16sqrt_fuzz.cpp
+ DEPENDS
+ libc.src.math.f16sqrt
+)
+
+add_libc_fuzzer(
+ hypot_fuzz
+ NEED_MPFR
+ SRCS
+ hypot_fuzz.cpp
+ DEPENDS
+ libc.src.math.hypot
+)
diff --git a/libc/fuzzing/math/f16sqrt_fuzz.cpp b/libc/fuzzing/math/f16sqrt_fuzz.cpp
new file mode 100644
index 0000000000000..5da079d72e8c0
--- /dev/null
+++ b/libc/fuzzing/math/f16sqrt_fuzz.cpp
@@ -0,0 +1,57 @@
+//===-- f16sqrt_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 f16sqrt implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/f16sqrt.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_t out;
+ mpfr_init2(input, 53);
+ mpfr_init2(out, 128);
+ for (size_t i = 0; i < size / sizeof(double); ++i) {
+ double x;
+ std::memcpy(&x, data, sizeof(double));
+ data += sizeof(double);
+
+ // remove NaN, inf, and values outside the accepted range
+ if (isnan(x) || isinf(x) || x < 0)
+ continue;
+ // signed zeros already tested in unit tests
+ if (signbit(x) && x == 0.0)
+ continue;
+
+ mpfr_set_d(input, x, MPFR_RNDN);
+ mpfr_sqrt(out, input, MPFR_RNDN);
+ float16 to_compare = mpfr_get_d(out, MPFR_RNDN);
+
+ float16 result = LIBC_NAMESPACE::f16sqrt(x);
+
+ if (result != to_compare) {
+ std::cout << std::hexfloat << "Failing input: " << x << std::endl;
+ std::cout << std::hexfloat
+ << "Failing output: " << static_cast<float>(result)
+ << std::endl;
+ std::cout << std::hexfloat
+ << "Expected: " << static_cast<float>(to_compare) << std::endl;
+ __builtin_trap();
+ }
+ }
+ mpfr_clear(input);
+ mpfr_clear(out);
+ return 0;
+}
diff --git a/libc/fuzzing/math/fsqrt_fuzz.cpp b/libc/fuzzing/math/fsqrt_fuzz.cpp
new file mode 100644
index 0000000000000..2525792ecc896
--- /dev/null
+++ b/libc/fuzzing/math/fsqrt_fuzz.cpp
@@ -0,0 +1,53 @@
+//===-- fsqrt_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 fsqrt implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/fsqrt.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_t out;
+ mpfr_init2(input, 53);
+ mpfr_init2(out, 128);
+ for (size_t i = 0; i < size / sizeof(double); ++i) {
+ double x;
+ std::memcpy(&x, data, sizeof(double));
+ data += sizeof(double);
+
+ // remove NaN, inf, and values outside the accepted range
+ if (isnan(x) || isinf(x) || x < 0)
+ continue;
+ // signed zeros already tested in unit tests
+ if (signbit(x) && x == 0.0)
+ continue;
+
+ mpfr_set_d(input, x, MPFR_RNDN);
+ mpfr_sqrt(out, input, MPFR_RNDN);
+ float to_compare = mpfr_get_flt(out, MPFR_RNDN);
+
+ float result = LIBC_NAMESPACE::fsqrt(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);
+ mpfr_clear(out);
+ return 0;
+}
\ No newline at end of file
diff --git a/libc/fuzzing/math/hypot_fuzz.cpp b/libc/fuzzing/math/hypot_fuzz.cpp
new file mode 100644
index 0000000000000..f3c3ea3361b69
--- /dev/null
+++ b/libc/fuzzing/math/hypot_fuzz.cpp
@@ -0,0 +1,64 @@
+//===-- hypot_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 hypot implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/hypot.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 in_x;
+ mpfr_t in_y;
+ mpfr_t out;
+ mpfr_init2(in_x, 53);
+ mpfr_init2(in_y, 53);
+ mpfr_init2(out, 128);
+
+ for (size_t i = 0; i < size / (2 * sizeof(double)); ++i) {
+ double x;
+ double y;
+
+ std::memcpy(&x, data, sizeof(double));
+ data += sizeof(double);
+ std::memcpy(&y, data, sizeof(double));
+ data += sizeof(double);
+
+ // remove NaN, inf, and signed zeros
+ if (isnan(x) || isinf(x) || (signbit(x) && x == 0.0))
+ return 0;
+ if (isnan(y) || isinf(y) || (signbit(y) && y == 0.0))
+ return 0;
+
+ mpfr_set_d(in_x, x, MPFR_RNDN);
+ mpfr_set_d(in_y, y, MPFR_RNDN);
+
+ int output = mpfr_hypot(out, in_x, in_y, MPFR_RNDN);
+ mpfr_subnormalize(out, output, MPFR_RNDN);
+ double to_compare = mpfr_get_d(out, MPFR_RNDN);
+
+ double result = LIBC_NAMESPACE::hypot(x, y);
+
+ if (result != to_compare) {
+ std::cout << std::hexfloat << "Failing x: " << x << std::endl;
+ std::cout << std::hexfloat << "Failing y: " << y << std::endl;
+ std::cout << std::hexfloat << "Failing output: " << result << std::endl;
+ std::cout << std::hexfloat << "Expected: " << to_compare << std::endl;
+ __builtin_trap();
+ }
+ }
+ mpfr_clear(in_x);
+ mpfr_clear(in_y);
+ mpfr_clear(out);
+ return 0;
+}
\ No newline at end of file
|
lntue
reviewed
Jul 24, 2025
lntue
reviewed
Jul 24, 2025
lntue
approved these changes
Jul 25, 2025
Collaborator
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/11/builds/20380 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
Added fuzz tests for f16sqrt, fsqrt, and hypot --------- Co-authored-by: Sriya Pratipati <[email protected]>
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Added fuzz tests for f16sqrt, fsqrt, and hypot