diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
@@ -2188,6 +2188,58 @@ add_fp_unittest(
   UNIT_TEST_ONLY
 )
 
+add_fp_unittest(
+  nearbyint_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    nearbyint_test.cpp
+  HDRS
+    NearbyIntTest.h
+  DEPENDS
+    libc.hdr.fenv_macros
+    libc.src.math.nearbyint
+)
+
+add_fp_unittest(
+  nearbyintf_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    nearbyintf_test.cpp
+  HDRS
+    NearbyIntTest.h
+  DEPENDS
+    libc.hdr.fenv_macros
+    libc.src.math.nearbyintf
+)
+
+add_fp_unittest(
+  nearbyintl_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    nearbyintl_test.cpp
+  HDRS
+    NearbyIntTest.h
+  DEPENDS
+    libc.hdr.fenv_macros
+    libc.src.math.nearbyintl
+)
+
+add_fp_unittest(
+  nearbyintf128_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    nearbyintf128_test.cpp
+  HDRS
+    NearbyIntTest.h
+  DEPENDS
+    libc.hdr.fenv_macros
+    libc.src.math.nearbyintf128
+)
+
 add_fp_unittest(
   nextafter_test
   SUITE
@@ -2739,7 +2791,6 @@ add_fp_unittest(
   DEPENDS
     libc.src.math.scalbn
     libc.src.__support.FPUtil.fp_bits
-    libc.src.__support.FPUtil.normal_float
 )
 
 add_fp_unittest(
@@ -2753,7 +2804,6 @@ add_fp_unittest(
   DEPENDS
     libc.src.math.scalbnf
     libc.src.__support.FPUtil.fp_bits
-    libc.src.__support.FPUtil.normal_float
 )
 
 add_fp_unittest(
@@ -2767,7 +2817,19 @@ add_fp_unittest(
   DEPENDS
     libc.src.math.scalbnl
     libc.src.__support.FPUtil.fp_bits
-    libc.src.__support.FPUtil.normal_float
+)
+
+add_fp_unittest(
+  scalbnf128_test
+  SUITE
+    libc-math-smoke-tests
+  SRCS
+    scalbnf128_test.cpp
+  HDRS
+    ScalbnTest.h
+  DEPENDS
+    libc.src.math.scalbnf128
+    libc.src.__support.FPUtil.fp_bits
 )
 
 add_fp_unittest(

diff --git a/libc/test/src/math/smoke/NearbyIntTest.h b/libc/test/src/math/smoke/NearbyIntTest.h
@@ -0,0 +1,100 @@
+//===-- Utility class to test different flavors of nearbyint ----*- 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_NEARBYINTTEST_H
+#define LLVM_LIBC_TEST_SRC_MATH_NEARBYINTTEST_H
+
+#include "hdr/fenv_macros.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
+#include "src/__support/FPUtil/FPBits.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+static constexpr int ROUNDING_MODES[4] = {FE_UPWARD, FE_DOWNWARD, FE_TOWARDZERO,
+                                          FE_TONEAREST};
+
+template <typename T>
+class NearbyIntTestTemplate : public LIBC_NAMESPACE::testing::Test {
+
+  DECLARE_SPECIAL_CONSTANTS(T)
+
+public:
+  typedef T (*NearbyIntFunc)(T);
+
+  void testNaN(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ALL_ROUNDING(func(aNaN), aNaN);
+  }
+
+  void testInfinities(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ALL_ROUNDING(func(inf), inf);
+    EXPECT_FP_EQ_ALL_ROUNDING(func(neg_inf), neg_inf);
+  }
+
+  void testZeroes(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ALL_ROUNDING(func(zero), zero);
+    EXPECT_FP_EQ_ALL_ROUNDING(func(neg_zero), neg_zero);
+  }
+
+  void testIntegers(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(1.0)), T(1.0));
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(-1.0)), T(-1.0));
+
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(1234.0)), T(1234.0));
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(-1234.0)), T(-1234.0));
+
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(10.0)), T(10.0));
+    EXPECT_FP_EQ_ALL_ROUNDING(func(T(-10.0)), T(-10.0));
+
+    FPBits ints_start(T(0));
+    ints_start.set_biased_exponent(FPBits::SIG_LEN + FPBits::EXP_BIAS);
+    T expected = ints_start.get_val();
+    EXPECT_FP_EQ_ALL_ROUNDING(func(expected), expected);
+  }
+
+  void testSubnormalToNearest(NearbyIntFunc func) {
+    ASSERT_FP_EQ(func(min_denormal), zero);
+    ASSERT_FP_EQ(func(-min_denormal), neg_zero);
+  }
+
+  void testSubnormalTowardZero(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ROUNDING_TOWARD_ZERO(func(min_denormal), zero);
+    EXPECT_FP_EQ_ROUNDING_TOWARD_ZERO(func(-min_denormal), neg_zero);
+  }
+
+  void testSubnormalToPosInf(NearbyIntFunc func) {
+    EXPECT_FP_EQ_ROUNDING_UPWARD(func(min_denormal), FPBits::one().get_val());
+    EXPECT_FP_EQ_ROUNDING_UPWARD(func(-min_denormal), neg_zero);
+  }
+
+  void testSubnormalToNegInf(NearbyIntFunc func) {
+    T negative_one = FPBits::one(Sign::NEG).get_val();
+    EXPECT_FP_EQ_ROUNDING_DOWNWARD(func(min_denormal), zero);
+    EXPECT_FP_EQ_ROUNDING_DOWNWARD(func(-min_denormal), negative_one);
+  }
+};
+
+#define LIST_NEARBYINT_TESTS(T, func)                                          \
+  using LlvmLibcNearbyIntTest = NearbyIntTestTemplate<T>;                      \
+  TEST_F(LlvmLibcNearbyIntTest, TestNaN) { testNaN(&func); }                   \
+  TEST_F(LlvmLibcNearbyIntTest, TestInfinities) { testInfinities(&func); }     \
+  TEST_F(LlvmLibcNearbyIntTest, TestZeroes) { testZeroes(&func); }             \
+  TEST_F(LlvmLibcNearbyIntTest, TestIntegers) { testIntegers(&func); }         \
+  TEST_F(LlvmLibcNearbyIntTest, TestSubnormalToNearest) {                      \
+    testSubnormalToNearest(&func);                                             \
+  }                                                                            \
+  TEST_F(LlvmLibcNearbyIntTest, TestSubnormalTowardZero) {                     \
+    testSubnormalTowardZero(&func);                                            \
+  }                                                                            \
+  TEST_F(LlvmLibcNearbyIntTest, TestSubnormalToPosInf) {                       \
+    testSubnormalToPosInf(&func);                                              \
+  }                                                                            \
+  TEST_F(LlvmLibcNearbyIntTest, TestSubnormalToNegInf) {                       \
+    testSubnormalToNegInf(&func);                                              \
+  }
+
+#endif // LLVM_LIBC_TEST_SRC_MATH_NEARBYINTTEST_H
diff --git a/libc/test/src/math/smoke/nearbyint_test.cpp b/libc/test/src/math/smoke/nearbyint_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for nearbyint -------------------------------------------===//
+//
+// 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 "NearbyIntTest.h"
+
+#include "src/math/nearbyint.h"
+
+LIST_NEARBYINT_TESTS(double, LIBC_NAMESPACE::nearbyint)
diff --git a/libc/test/src/math/smoke/nearbyintf128_test.cpp b/libc/test/src/math/smoke/nearbyintf128_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for nearbyintf128 ---------------------------------------===//
+//
+// 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 "NearbyIntTest.h"
+
+#include "src/math/nearbyintf128.h"
+
+LIST_NEARBYINT_TESTS(float128, LIBC_NAMESPACE::nearbyintf128)
diff --git a/libc/test/src/math/smoke/nearbyintf_test.cpp b/libc/test/src/math/smoke/nearbyintf_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for nearbyintf ------------------------------------------===//
+//
+// 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 "NearbyIntTest.h"
+
+#include "src/math/nearbyintf.h"
+
+LIST_NEARBYINT_TESTS(float, LIBC_NAMESPACE::nearbyintf)
diff --git a/libc/test/src/math/smoke/nearbyintl_test.cpp b/libc/test/src/math/smoke/nearbyintl_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for nearbyintl ------------------------------------------===//
+//
+// 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 "NearbyIntTest.h"
+
+#include "src/math/nearbyintl.h"
+
+LIST_NEARBYINT_TESTS(long double, LIBC_NAMESPACE::nearbyintl)
diff --git a/libc/test/src/math/smoke/scalbnf128_test.cpp b/libc/test/src/math/smoke/scalbnf128_test.cpp
@@ -0,0 +1,13 @@
+//===-- Unittests for scalbnf128 ------------------------------------------===//
+//
+// 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 "ScalbnTest.h"
+
+#include "src/math/scalbnf128.h"
+
+LIST_SCALBN_TESTS(float128, LIBC_NAMESPACE::scalbnf128)