diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
@@ -1597,6 +1597,66 @@ add_fp_unittest(
     libc.src.__support.FPUtil.manipulation_functions
 )
 
+add_fp_unittest(
+  issignaling_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    issignaling_test.cpp
+  HDRS
+    IsSignalingTest.h
+  DEPENDS
+    libc.src.math.issignaling
+)
+
+add_fp_unittest(
+  issignalingf_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    issignalingf_test.cpp
+  HDRS
+    IsSignalingTest.h
+  DEPENDS
+    libc.src.math.issignalingf
+)
+
+add_fp_unittest(
+  issignalingl_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    issignalingl_test.cpp
+  HDRS
+    IsSignalingTest.h
+  DEPENDS
+    libc.src.math.issignalingl
+)
+
+add_fp_unittest(
+  issignalingf16_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    issignalingf16_test.cpp
+  HDRS
+    IsSignalingTest.h
+  DEPENDS
+    libc.src.math.issignalingf16
+)
+
+add_fp_unittest(
+  issignalingf128_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    issignalingf128_test.cpp
+  HDRS
+    IsSignalingTest.h
+  DEPENDS
+    libc.src.math.issignalingf128
+)
+
 add_fp_unittest(
   llogb_test
   SUITE

diff --git a/libc/test/src/math/smoke/IsSignalingTest.h b/libc/test/src/math/smoke/IsSignalingTest.h
@@ -0,0 +1,60 @@
+//===-- Utility class to test different flavors of issignaling --*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TEST_SRC_MATH_SMOKE_ISSIGNALINGTEST_H
+#define LLVM_LIBC_TEST_SRC_MATH_SMOKE_ISSIGNALINGTEST_H
+
+#include "test/UnitTest/FEnvSafeTest.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+#include "hdr/math_macros.h"
+
+template <typename T>
+class IsSignalingTest : public LIBC_NAMESPACE::testing::FEnvSafeTest {
+
+  DECLARE_SPECIAL_CONSTANTS(T)
+
+public:
+  typedef int (*IsSignalingFunc)(T);
+
+  void testSpecialNumbers(IsSignalingFunc func) {
+    EXPECT_EQ(func(aNaN), 0);
+    EXPECT_EQ(func(neg_aNaN), 0);
+    EXPECT_EQ(func(sNaN), 1);
+    EXPECT_EQ(func(neg_sNaN), 1);
+    EXPECT_EQ(func(inf), 0);
+    EXPECT_EQ(func(neg_inf), 0);
+    EXPECT_EQ(func(min_normal), 0);
+    EXPECT_EQ(func(max_normal), 0);
+    EXPECT_EQ(func(neg_max_normal), 0);
+    EXPECT_EQ(func(min_denormal), 0);
+    EXPECT_EQ(func(neg_min_denormal), 0);
+    EXPECT_EQ(func(max_denormal), 0);
+    EXPECT_EQ(func(zero), 0);
+    EXPECT_EQ(func(neg_zero), 0);
+  }
+
+  void testRoundedNumbers(IsSignalingFunc func) {
+    EXPECT_EQ(func(T(1.0)), 0);
+    EXPECT_EQ(func(T(-1.0)), 0);
+    EXPECT_EQ(func(T(10.0)), 0);
+    EXPECT_EQ(func(T(-10.0)), 0);
+    EXPECT_EQ(func(T(1234.0)), 0);
+    EXPECT_EQ(func(T(-1234.0)), 0);
+  }
+};
+
+#define LIST_ISSIGNALING_TESTS(T, func)                                        \
+  using LlvmLibcIsSignalingTest = IsSignalingTest<T>;                          \
+  TEST_F(LlvmLibcIsSignalingTest, SpecialNumbers) {                            \
+    testSpecialNumbers(&func);                                                 \
+  }                                                                            \
+  TEST_F(LlvmLibcIsSignalingTest, RoundedNubmers) { testRoundedNumbers(&func); }
+
+#endif // LLVM_LIBC_TEST_SRC_MATH_SMOKE_ISSIGNALINGTEST_H
diff --git a/libc/test/src/math/smoke/issignaling_test.cpp b/libc/test/src/math/smoke/issignaling_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for issignaling -----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsSignalingTest.h"
+
+#include "src/math/issignaling.h"
+
+LIST_ISSIGNALING_TESTS(double, LIBC_NAMESPACE::issignaling)
diff --git a/libc/test/src/math/smoke/issignalingf128_test.cpp b/libc/test/src/math/smoke/issignalingf128_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for issignalingf128 -------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsSignalingTest.h"
+
+#include "src/math/issignalingf128.h"
+
+LIST_ISSIGNALING_TESTS(float128, LIBC_NAMESPACE::issignalingf128)
diff --git a/libc/test/src/math/smoke/issignalingf16_test.cpp b/libc/test/src/math/smoke/issignalingf16_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for issignalingf16 --------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsSignalingTest.h"
+
+#include "src/math/issignalingf16.h"
+
+LIST_ISSIGNALING_TESTS(float16, LIBC_NAMESPACE::issignalingf16)
diff --git a/libc/test/src/math/smoke/issignalingf_test.cpp b/libc/test/src/math/smoke/issignalingf_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for issignalingf ----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsSignalingTest.h"
+
+#include "src/math/issignalingf.h"
+
+LIST_ISSIGNALING_TESTS(float, LIBC_NAMESPACE::issignalingf)
diff --git a/libc/test/src/math/smoke/issignalingl_test.cpp b/libc/test/src/math/smoke/issignalingl_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for issignalingl ----------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "IsSignalingTest.h"
+
+#include "src/math/issignalingl.h"
+
+LIST_ISSIGNALING_TESTS(long double, LIBC_NAMESPACE::issignalingl)