[libc] sqrt and log functions fuzz tests

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.__support.FPUtil.generic.sqrt
+)

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;
+}

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;
+}

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;
+}

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;
+}

libc/fuzzing/math/sincos_fuzz.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 ///
-/// Fuzzing test for llvm-libc cos implementation.
+/// Fuzzing test for llvm-libc sincos implementation.
 ///
 //===----------------------------------------------------------------------===//
 

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/__support/FPUtil/generic/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::fputil::sqrt<double>(x);
+
+  if (result != to_compare)
+    __builtin_trap();
+
+  mpfr_clear(input);
+  return 0;
+}