1 files changed, 64 insertions, 0 deletions
diff --git a/libc/fuzzing/math/hypot_fuzz.cpp b/libc/fuzzing/math/hypot_fuzz.cpp
new file mode 100644
index 0000000..6129e41
--- /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;
+}