[libc-commits] [libc] [libc] sqrt and log functions fuzz tests (PR #148006)

[via libc-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: None (sribee8)

<details>
<summary>Changes</summary>

added fuzz tests for sqrt and log functions

---
Full diff: https://github.com/llvm/llvm-project/pull/148006.diff


7 Files Affected:

- (modified) libc/fuzzing/math/CMakeLists.txt (+45) 
- (added) libc/fuzzing/math/log10_fuzz.cpp (+38) 
- (added) libc/fuzzing/math/log1p_fuzz.cpp (+38) 
- (added) libc/fuzzing/math/log2_fuzz.cpp (+38) 
- (added) libc/fuzzing/math/log_fuzz.cpp (+38) 
- (modified) libc/fuzzing/math/sincos_fuzz.cpp (+1-1) 
- (added) libc/fuzzing/math/sqrt_fuzz.cpp (+38) 


``````````diff
diff --git a/libc/fuzzing/math/CMakeLists.txt b/libc/fuzzing/math/CMakeLists.txt
index e3c29651917fc..06f8f024762b9 100644
--- a/libc/fuzzing/math/CMakeLists.txt
+++ b/libc/fuzzing/math/CMakeLists.txt
@@ -124,3 +124,48 @@ add_libc_fuzzer(
   DEPENDS
     libc.src.math.sincos
 )
+
+add_libc_fuzzer(
+  log_fuzz
+  NEED_MPFR
+  SRCS
+    log_fuzz.cpp
+  DEPENDS
+    libc.src.math.log
+)
+
+add_libc_fuzzer(
+  log10_fuzz
+  NEED_MPFR
+  SRCS
+    log10_fuzz.cpp
+  DEPENDS
+    libc.src.math.log10
+)
+
+add_libc_fuzzer(
+  log1p_fuzz
+  NEED_MPFR
+  SRCS
+    log1p_fuzz.cpp
+  DEPENDS
+    libc.src.math.log1p
+)
+
+add_libc_fuzzer(
+  log2_fuzz
+  NEED_MPFR
+  SRCS
+    log2_fuzz.cpp
+  DEPENDS
+    libc.src.math.log2
+)
+
+add_libc_fuzzer(
+  sqrt_fuzz
+  NEED_MPFR
+  SRCS
+    sqrt_fuzz.cpp
+  DEPENDS
+    libc.src.math.sqrt
+)
diff --git a/libc/fuzzing/math/log10_fuzz.cpp b/libc/fuzzing/math/log10_fuzz.cpp
new file mode 100644
index 0000000000000..b5233588e83f8
--- /dev/null
+++ b/libc/fuzzing/math/log10_fuzz.cpp
@@ -0,0 +1,38 @@
+//===-- log10_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 log10 implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/log10.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 < 0)
+    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_log10(input, input, MPFR_RNDN);
+  mpfr_subnormalize(input, output, MPFR_RNDN);
+  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+  double result = LIBC_NAMESPACE::log10(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}
diff --git a/libc/fuzzing/math/log1p_fuzz.cpp b/libc/fuzzing/math/log1p_fuzz.cpp
new file mode 100644
index 0000000000000..c40aad018794f
--- /dev/null
+++ b/libc/fuzzing/math/log1p_fuzz.cpp
@@ -0,0 +1,38 @@
+//===-- log1p_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 log1p implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/log1p.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 < 0)
+    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_log1p(input, input, MPFR_RNDN);
+  mpfr_subnormalize(input, output, MPFR_RNDN);
+  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+  double result = LIBC_NAMESPACE::log1p(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}
diff --git a/libc/fuzzing/math/log2_fuzz.cpp b/libc/fuzzing/math/log2_fuzz.cpp
new file mode 100644
index 0000000000000..3a7d9956b4bea
--- /dev/null
+++ b/libc/fuzzing/math/log2_fuzz.cpp
@@ -0,0 +1,38 @@
+//===-- log2_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 log2 implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/log2.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 < 0)
+    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_log2(input, input, MPFR_RNDN);
+  mpfr_subnormalize(input, output, MPFR_RNDN);
+  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+  double result = LIBC_NAMESPACE::log2(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}
diff --git a/libc/fuzzing/math/log_fuzz.cpp b/libc/fuzzing/math/log_fuzz.cpp
new file mode 100644
index 0000000000000..1271fb73fd1a0
--- /dev/null
+++ b/libc/fuzzing/math/log_fuzz.cpp
@@ -0,0 +1,38 @@
+//===-- log_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 log implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/log.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 < 0)
+    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_log(input, input, MPFR_RNDN);
+  mpfr_subnormalize(input, output, MPFR_RNDN);
+  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+  double result = LIBC_NAMESPACE::log(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}
diff --git a/libc/fuzzing/math/sincos_fuzz.cpp b/libc/fuzzing/math/sincos_fuzz.cpp
index 8cc6f7291a3df..fd3dfae23168c 100644
--- a/libc/fuzzing/math/sincos_fuzz.cpp
+++ b/libc/fuzzing/math/sincos_fuzz.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 ///
-/// Fuzzing test for llvm-libc cos implementation.
+/// Fuzzing test for llvm-libc sincos implementation.
 ///
 //===----------------------------------------------------------------------===//
 
diff --git a/libc/fuzzing/math/sqrt_fuzz.cpp b/libc/fuzzing/math/sqrt_fuzz.cpp
new file mode 100644
index 0000000000000..48e17f481a256
--- /dev/null
+++ b/libc/fuzzing/math/sqrt_fuzz.cpp
@@ -0,0 +1,38 @@
+//===-- sqrt_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 sqrt implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/math/sqrt.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 < 0)
+    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_sqrt(input, input, MPFR_RNDN);
+  mpfr_subnormalize(input, output, MPFR_RNDN);
+  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+
+  double result = LIBC_NAMESPACE::sqrt(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/148006