[libc-commits] [libc] [libc] Updated exp fuzz tests (PR #148912)

[via libc-commits]

https://github.com/sribee8 created https://github.com/llvm/llvm-project/pull/148912

Fuzz tests were previously in the wrong format, updated them to correct format.

>From 198b6bd917af160ac94a594c84c5f01679824b66 Mon Sep 17 00:00:00 2001
From: Sriya Pratipati <sriyap at google.com>
Date: Tue, 15 Jul 2025 17:52:55 +0000
Subject: [PATCH] [libc] Updated exp fuzz tests

Fuzz tests were previously in the wrong format, updated them to correct format.
---
 libc/fuzzing/math/exp10_fuzz.cpp | 38 +++++++++++++++++++------------
 libc/fuzzing/math/exp2_fuzz.cpp  | 39 ++++++++++++++++++++------------
 libc/fuzzing/math/exp_fuzz.cpp   | 39 ++++++++++++++++++++------------
 libc/fuzzing/math/expm1_fuzz.cpp | 39 ++++++++++++++++++++------------
 4 files changed, 99 insertions(+), 56 deletions(-)

diff --git a/libc/fuzzing/math/exp10_fuzz.cpp b/libc/fuzzing/math/exp10_fuzz.cpp
index 2baef03a264a4..3dba9b129521f 100644
--- a/libc/fuzzing/math/exp10_fuzz.cpp
+++ b/libc/fuzzing/math/exp10_fuzz.cpp
@@ -12,27 +12,37 @@
 
 #include "src/math/exp10.h"
 #include "utils/MPFRWrapper/mpfr_inc.h"
+#include <cstdint>
+#include <cstring>
+#include <iostream>
 #include <math.h>
 
-extern "C" int LLVMFuzzerTestOneInput(double x) {
-  // remove NaN and inf
-  if (isnan(x) || isinf(x))
-    return 0;
-  // signed zeros already tested in unit tests
-  if (signbit(x) && x == 0.0)
-    return 0;
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   mpfr_t input;
   mpfr_init2(input, 53);
-  mpfr_set_d(input, x, MPFR_RNDN);
-  int output = mpfr_exp10(input, input, MPFR_RNDN);
-  mpfr_subnormalize(input, output, MPFR_RNDN);
-  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+  for (size_t i = 0; i < size / sizeof(double); ++i) {
+    double x;
+    std::memcpy(&x, data, sizeof(double)); // remove NaN and inf
+    if (isnan(x) || isinf(x))
+      return 0;
+    // signed zeros already tested in unit tests
+    if (signbit(x) && x == 0.0)
+      return 0;
 
-  double result = LIBC_NAMESPACE::exp10(x);
+    mpfr_set_d(input, x, MPFR_RNDN);
+    int output = mpfr_exp10(input, input, MPFR_RNDN);
+    mpfr_subnormalize(input, output, MPFR_RNDN);
+    double to_compare = mpfr_get_d(input, MPFR_RNDN);
 
-  if (result != to_compare)
-    __builtin_trap();
+    double result = LIBC_NAMESPACE::exp10(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;
 }
diff --git a/libc/fuzzing/math/exp2_fuzz.cpp b/libc/fuzzing/math/exp2_fuzz.cpp
index 8a2959047a6ca..3c2f58915fa50 100644
--- a/libc/fuzzing/math/exp2_fuzz.cpp
+++ b/libc/fuzzing/math/exp2_fuzz.cpp
@@ -12,27 +12,38 @@
 
 #include "src/math/exp2.h"
 #include "utils/MPFRWrapper/mpfr_inc.h"
+#include <cstdint>
+#include <cstring>
+#include <iostream>
 #include <math.h>
 
-extern "C" int LLVMFuzzerTestOneInput(double x) {
-  // remove NaN and inf
-  if (isnan(x) || isinf(x))
-    return 0;
-  // signed zeros already tested in unit tests
-  if (signbit(x) && x == 0.0)
-    return 0;
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   mpfr_t input;
   mpfr_init2(input, 53);
-  mpfr_set_d(input, x, MPFR_RNDN);
-  int output = mpfr_exp2(input, input, MPFR_RNDN);
-  mpfr_subnormalize(input, output, MPFR_RNDN);
-  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+  for (size_t i = 0; i < size / sizeof(double); ++i) {
+    double x;
+    std::memcpy(&x, data, sizeof(double));
+    // remove NaN and inf
+    if (isnan(x) || isinf(x))
+      return 0;
+    // signed zeros already tested in unit tests
+    if (signbit(x) && x == 0.0)
+      return 0;
 
-  double result = LIBC_NAMESPACE::exp2(x);
+    mpfr_set_d(input, x, MPFR_RNDN);
+    int output = mpfr_exp2(input, input, MPFR_RNDN);
+    mpfr_subnormalize(input, output, MPFR_RNDN);
+    double to_compare = mpfr_get_d(input, MPFR_RNDN);
 
-  if (result != to_compare)
-    __builtin_trap();
+    double result = LIBC_NAMESPACE::exp2(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;
 }
diff --git a/libc/fuzzing/math/exp_fuzz.cpp b/libc/fuzzing/math/exp_fuzz.cpp
index 97bc12dfa64c9..13a81623d5c02 100644
--- a/libc/fuzzing/math/exp_fuzz.cpp
+++ b/libc/fuzzing/math/exp_fuzz.cpp
@@ -12,27 +12,38 @@
 
 #include "src/math/exp.h"
 #include "utils/MPFRWrapper/mpfr_inc.h"
+#include <cstdint>
+#include <cstring>
+#include <iostream>
 #include <math.h>
 
-extern "C" int LLVMFuzzerTestOneInput(double x) {
-  // remove NaN and inf
-  if (isnan(x) || isinf(x))
-    return 0;
-  // signed zeros already tested in unit tests
-  if (signbit(x) && x == 0.0)
-    return 0;
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   mpfr_t input;
   mpfr_init2(input, 53);
-  mpfr_set_d(input, x, MPFR_RNDN);
-  int output = mpfr_exp(input, input, MPFR_RNDN);
-  mpfr_subnormalize(input, output, MPFR_RNDN);
-  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+  for (size_t i = 0; i < size / sizeof(double); ++i) {
+    double x;
+    std::memcpy(&x, data, sizeof(double));
+    // remove NaN and inf
+    if (isnan(x) || isinf(x))
+      return 0;
+    // signed zeros already tested in unit tests
+    if (signbit(x) && x == 0.0)
+      return 0;
 
-  double result = LIBC_NAMESPACE::exp(x);
+    mpfr_set_d(input, x, MPFR_RNDN);
+    int output = mpfr_exp(input, input, MPFR_RNDN);
+    mpfr_subnormalize(input, output, MPFR_RNDN);
+    double to_compare = mpfr_get_d(input, MPFR_RNDN);
 
-  if (result != to_compare)
-    __builtin_trap();
+    double result = LIBC_NAMESPACE::exp(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;
 }
diff --git a/libc/fuzzing/math/expm1_fuzz.cpp b/libc/fuzzing/math/expm1_fuzz.cpp
index db507bb02b1d7..464d799565747 100644
--- a/libc/fuzzing/math/expm1_fuzz.cpp
+++ b/libc/fuzzing/math/expm1_fuzz.cpp
@@ -12,27 +12,38 @@
 
 #include "src/math/expm1.h"
 #include "utils/MPFRWrapper/mpfr_inc.h"
+#include <cstdint>
+#include <cstring>
+#include <iostream>
 #include <math.h>
 
-extern "C" int LLVMFuzzerTestOneInput(double x) {
-  // remove NaN and inf
-  if (isnan(x) || isinf(x))
-    return 0;
-  // signed zeros already tested in unit tests
-  if (signbit(x) && x == 0.0)
-    return 0;
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   mpfr_t input;
   mpfr_init2(input, 53);
-  mpfr_set_d(input, x, MPFR_RNDN);
-  int output = mpfr_expm1(input, input, MPFR_RNDN);
-  mpfr_subnormalize(input, output, MPFR_RNDN);
-  double to_compare = mpfr_get_d(input, MPFR_RNDN);
+  for (size_t i = 0; i < size / sizeof(double); ++i) {
+    double x;
+    std::memcpy(&x, data, sizeof(double));
+    // remove NaN and inf
+    if (isnan(x) || isinf(x))
+      return 0;
+    // signed zeros already tested in unit tests
+    if (signbit(x) && x == 0.0)
+      return 0;
 
-  double result = LIBC_NAMESPACE::expm1(x);
+    mpfr_set_d(input, x, MPFR_RNDN);
+    int output = mpfr_expm1(input, input, MPFR_RNDN);
+    mpfr_subnormalize(input, output, MPFR_RNDN);
+    double to_compare = mpfr_get_d(input, MPFR_RNDN);
 
-  if (result != to_compare)
-    __builtin_trap();
+    double result = LIBC_NAMESPACE::expm1(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;
 }