[libc-commits] [libc] [libc][math][c23] Add nextup{, f, f128} and nextdown{, f, f128} functions (PR #85431)
via libc-commits
libc-commits at lists.llvm.org
Fri Mar 15 10:01:01 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: OverMighty (overmighty)
<details>
<summary>Changes</summary>
See https://github.com/llvm/llvm-project/issues/85283.
I had a test for `nextdownl` that was failing and I thought I should add `nextupl` and `nextdownl` later and first make a PR for the other functions.
cc @<!-- -->lntue
---
Patch is 26.12 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/85431.diff
26 Files Affected:
- (modified) libc/config/linux/x86_64/entrypoints.txt (+6)
- (modified) libc/spec/stdc.td (+8)
- (modified) libc/src/__support/FPUtil/ManipulationFunctions.h (+21)
- (modified) libc/src/math/CMakeLists.txt (+8)
- (modified) libc/src/math/generic/CMakeLists.txt (+74)
- (added) libc/src/math/generic/nextdown.cpp (+19)
- (added) libc/src/math/generic/nextdownf.cpp (+19)
- (added) libc/src/math/generic/nextdownf128.cpp (+19)
- (added) libc/src/math/generic/nextup.cpp (+19)
- (added) libc/src/math/generic/nextupf.cpp (+19)
- (added) libc/src/math/generic/nextupf128.cpp (+19)
- (added) libc/src/math/nextdown.h (+18)
- (added) libc/src/math/nextdownf.h (+18)
- (added) libc/src/math/nextdownf128.h (+20)
- (added) libc/src/math/nextup.h (+18)
- (added) libc/src/math/nextupf.h (+18)
- (added) libc/src/math/nextupf128.h (+20)
- (modified) libc/test/src/math/smoke/CMakeLists.txt (+84)
- (added) libc/test/src/math/smoke/NextDownTest.h (+55)
- (added) libc/test/src/math/smoke/NextUpTest.h (+55)
- (added) libc/test/src/math/smoke/nextdown_test.cpp (+13)
- (added) libc/test/src/math/smoke/nextdownf128_test.cpp (+13)
- (added) libc/test/src/math/smoke/nextdownf_test.cpp (+13)
- (added) libc/test/src/math/smoke/nextup_test.cpp (+13)
- (added) libc/test/src/math/smoke/nextupf128_test.cpp (+13)
- (added) libc/test/src/math/smoke/nextupf_test.cpp (+13)
``````````diff
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 4fb31c593b9dc7..f484ebf1d4df94 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -429,6 +429,10 @@ set(TARGET_LIBM_ENTRYPOINTS
libc.src.math.nexttoward
libc.src.math.nexttowardf
libc.src.math.nexttowardl
+ libc.src.math.nextdown
+ libc.src.math.nextdownf
+ libc.src.math.nextup
+ libc.src.math.nextupf
libc.src.math.powf
libc.src.math.remainderf
libc.src.math.remainder
@@ -482,6 +486,8 @@ if(LIBC_TYPES_HAS_FLOAT128)
libc.src.math.lroundf128
libc.src.math.modff128
libc.src.math.nextafterf128
+ libc.src.math.nextdownf128
+ libc.src.math.nextupf128
libc.src.math.rintf128
libc.src.math.roundf128
libc.src.math.sqrtf128
diff --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index afe01b1bb68566..118f9527e7264e 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -536,6 +536,14 @@ def StdC : StandardSpec<"stdc"> {
FunctionSpec<"nexttoward", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<LongDoubleType>]>,
FunctionSpec<"nexttowardl", RetValSpec<LongDoubleType>, [ArgSpec<LongDoubleType>, ArgSpec<LongDoubleType>]>,
+ FunctionSpec<"nextdown", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
+ FunctionSpec<"nextdownf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
+ GuardedFunctionSpec<"nextdownf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
+
+ FunctionSpec<"nextup", RetValSpec<DoubleType>, [ArgSpec<DoubleType>]>,
+ FunctionSpec<"nextupf", RetValSpec<FloatType>, [ArgSpec<FloatType>]>,
+ GuardedFunctionSpec<"nextupf128", RetValSpec<Float128Type>, [ArgSpec<Float128Type>], "LIBC_TYPES_HAS_FLOAT128">,
+
FunctionSpec<"powf", RetValSpec<FloatType>, [ArgSpec<FloatType>, ArgSpec<FloatType>]>,
FunctionSpec<"pow", RetValSpec<DoubleType>, [ArgSpec<DoubleType>, ArgSpec<DoubleType>]>,
diff --git a/libc/src/__support/FPUtil/ManipulationFunctions.h b/libc/src/__support/FPUtil/ManipulationFunctions.h
index f148d984f5f35c..c01cb4a5f823fb 100644
--- a/libc/src/__support/FPUtil/ManipulationFunctions.h
+++ b/libc/src/__support/FPUtil/ManipulationFunctions.h
@@ -230,6 +230,27 @@ LIBC_INLINE T nextafter(T from, U to) {
return from_bits.get_val();
}
+template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
+LIBC_INLINE T nextupdown(T x, Sign sign) {
+ FPBits<T> xbits(x);
+ if (xbits.is_nan() || xbits == FPBits<T>::max_normal(sign) ||
+ xbits == FPBits<T>::inf(sign))
+ return x;
+
+ using StorageType = typename FPBits<T>::StorageType;
+ if (x != T(0)) {
+ if (xbits.sign() == sign) {
+ xbits = FPBits<T>(StorageType(xbits.uintval() + 1));
+ } else {
+ xbits = FPBits<T>(StorageType(xbits.uintval() - 1));
+ }
+ } else {
+ xbits = FPBits<T>::min_subnormal(sign);
+ }
+
+ return xbits.get_val();
+}
+
} // namespace fputil
} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index 750fd5f0e3a9ba..d5607585024735 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -204,6 +204,14 @@ add_math_entrypoint_object(nexttoward)
add_math_entrypoint_object(nexttowardf)
add_math_entrypoint_object(nexttowardl)
+add_math_entrypoint_object(nextdown)
+add_math_entrypoint_object(nextdownf)
+add_math_entrypoint_object(nextdownf128)
+
+add_math_entrypoint_object(nextup)
+add_math_entrypoint_object(nextupf)
+add_math_entrypoint_object(nextupf128)
+
add_math_entrypoint_object(pow)
add_math_entrypoint_object(powf)
diff --git a/libc/src/math/generic/CMakeLists.txt b/libc/src/math/generic/CMakeLists.txt
index 667381d615d1e0..fd3e846b9f7f41 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -1865,6 +1865,80 @@ add_entrypoint_object(
-O3
)
+add_entrypoint_object(
+ nextdown
+ SRCS
+ nextdown.cpp
+ HDRS
+ ../nextdown.h
+ DEPENDS
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
+add_entrypoint_object(
+ nextdownf
+ SRCS
+ nextdownf.cpp
+ HDRS
+ ../nextdownf.h
+ DEPENDS
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
+add_entrypoint_object(
+ nextdownf128
+ SRCS
+ nextdownf128.cpp
+ HDRS
+ ../nextdownf128.h
+ DEPENDS
+ libc.src.__support.macros.properties.types
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
+add_entrypoint_object(
+ nextup
+ SRCS
+ nextup.cpp
+ HDRS
+ ../nextup.h
+ DEPENDS
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
+add_entrypoint_object(
+ nextupf
+ SRCS
+ nextupf.cpp
+ HDRS
+ ../nextupf.h
+ DEPENDS
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
+add_entrypoint_object(
+ nextupf128
+ SRCS
+ nextupf128.cpp
+ HDRS
+ ../nextupf128.h
+ DEPENDS
+ libc.src.__support.macros.properties.types
+ libc.src.__support.FPUtil.manipulation_functions
+ COMPILE_OPTIONS
+ -O3
+)
+
add_entrypoint_object(
fmod
SRCS
diff --git a/libc/src/math/generic/nextdown.cpp b/libc/src/math/generic/nextdown.cpp
new file mode 100644
index 00000000000000..664b5b1f585551
--- /dev/null
+++ b/libc/src/math/generic/nextdown.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextdown function -------------------------------===//
+//
+// 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 "src/math/nextdown.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(double, nextdown, (double x)) {
+ return fputil::nextupdown(x, fputil::Sign::NEG);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/generic/nextdownf.cpp b/libc/src/math/generic/nextdownf.cpp
new file mode 100644
index 00000000000000..21c4f4f4a7a084
--- /dev/null
+++ b/libc/src/math/generic/nextdownf.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextdownf function ------------------------------===//
+//
+// 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 "src/math/nextdownf.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float, nextdownf, (float x)) {
+ return fputil::nextupdown(x, fputil::Sign::NEG);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/generic/nextdownf128.cpp b/libc/src/math/generic/nextdownf128.cpp
new file mode 100644
index 00000000000000..487ea52cabd55a
--- /dev/null
+++ b/libc/src/math/generic/nextdownf128.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextdownf128 function ---------------------------===//
+//
+// 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 "src/math/nextdownf128.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float128, nextdownf128, (float128 x)) {
+ return fputil::nextupdown(x, fputil::Sign::NEG);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/generic/nextup.cpp b/libc/src/math/generic/nextup.cpp
new file mode 100644
index 00000000000000..bf58533e793b82
--- /dev/null
+++ b/libc/src/math/generic/nextup.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextup function ---------------------------------===//
+//
+// 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 "src/math/nextup.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(double, nextup, (double x)) {
+ return fputil::nextupdown(x, fputil::Sign::POS);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/generic/nextupf.cpp b/libc/src/math/generic/nextupf.cpp
new file mode 100644
index 00000000000000..2daebe7a5ff645
--- /dev/null
+++ b/libc/src/math/generic/nextupf.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextupf function --------------------------------===//
+//
+// 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 "src/math/nextupf.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float, nextupf, (float x)) {
+ return fputil::nextupdown(x, fputil::Sign::POS);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/generic/nextupf128.cpp b/libc/src/math/generic/nextupf128.cpp
new file mode 100644
index 00000000000000..09097a42480bf4
--- /dev/null
+++ b/libc/src/math/generic/nextupf128.cpp
@@ -0,0 +1,19 @@
+//===-- Implementation of nextupf128 function -----------------------------===//
+//
+// 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 "src/math/nextupf128.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(float128, nextupf128, (float128 x)) {
+ return fputil::nextupdown(x, fputil::Sign::POS);
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/math/nextdown.h b/libc/src/math/nextdown.h
new file mode 100644
index 00000000000000..8049b170ee7211
--- /dev/null
+++ b/libc/src/math/nextdown.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for nextdown ----------------------*- 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_SRC_MATH_NEXTDOWN_H
+#define LLVM_LIBC_SRC_MATH_NEXTDOWN_H
+
+namespace LIBC_NAMESPACE {
+
+double nextdown(double x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTDOWN_H
diff --git a/libc/src/math/nextdownf.h b/libc/src/math/nextdownf.h
new file mode 100644
index 00000000000000..0a2f23480574dc
--- /dev/null
+++ b/libc/src/math/nextdownf.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for nextdownf ---------------------*- 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_SRC_MATH_NEXTDOWNF_H
+#define LLVM_LIBC_SRC_MATH_NEXTDOWNF_H
+
+namespace LIBC_NAMESPACE {
+
+float nextdownf(float x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTDOWNF_H
diff --git a/libc/src/math/nextdownf128.h b/libc/src/math/nextdownf128.h
new file mode 100644
index 00000000000000..0a3043bb431d82
--- /dev/null
+++ b/libc/src/math/nextdownf128.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for nextdownf128 ------------------*- 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_SRC_MATH_NEXTDOWNF128_H
+#define LLVM_LIBC_SRC_MATH_NEXTDOWNF128_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float128 nextdownf128(float128 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTDOWNF128_H
diff --git a/libc/src/math/nextup.h b/libc/src/math/nextup.h
new file mode 100644
index 00000000000000..97ae82270b06e4
--- /dev/null
+++ b/libc/src/math/nextup.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for nextup ------------------------*- 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_SRC_MATH_NEXTUP_H
+#define LLVM_LIBC_SRC_MATH_NEXTUP_H
+
+namespace LIBC_NAMESPACE {
+
+double nextup(double x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTUP_H
diff --git a/libc/src/math/nextupf.h b/libc/src/math/nextupf.h
new file mode 100644
index 00000000000000..ffc0fa168a1086
--- /dev/null
+++ b/libc/src/math/nextupf.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for nextupf -----------------------*- 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_SRC_MATH_NEXTUPF_H
+#define LLVM_LIBC_SRC_MATH_NEXTUPF_H
+
+namespace LIBC_NAMESPACE {
+
+float nextupf(float x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTUPF_H
diff --git a/libc/src/math/nextupf128.h b/libc/src/math/nextupf128.h
new file mode 100644
index 00000000000000..b4429922e4beb7
--- /dev/null
+++ b/libc/src/math/nextupf128.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for nextupf128 --------------------*- 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_SRC_MATH_NEXTUPF128_H
+#define LLVM_LIBC_SRC_MATH_NEXTUPF128_H
+
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE {
+
+float128 nextupf128(float128 x);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTUPF128_H
diff --git a/libc/test/src/math/smoke/CMakeLists.txt b/libc/test/src/math/smoke/CMakeLists.txt
index 293e65abd44f5a..13857d28c0e4d3 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -1614,6 +1614,90 @@ add_fp_unittest(
libc.src.__support.FPUtil.fp_bits
)
+add_fp_unittest(
+ nextdown_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextdown_test.cpp
+ HDRS
+ NextDownTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextdown
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
+add_fp_unittest(
+ nextdownf_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextdownf_test.cpp
+ HDRS
+ NextDownTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextdownf
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
+add_fp_unittest(
+ nextdownf128_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextdownf128_test.cpp
+ HDRS
+ NextDownTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextdownf128
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
+add_fp_unittest(
+ nextup_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextup_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextup
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
+add_fp_unittest(
+ nextupf_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextupf_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextupf
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
+add_fp_unittest(
+ nextupf128_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextupf128_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.include.math
+ libc.src.math.nextupf128
+ libc.src.__support.FPUtil.manipulation_functions
+)
+
# TODO(lntue): The current implementation of fputil::general::fma<float> is only
# correctly rounded for the default rounding mode round-to-nearest tie-to-even.
add_fp_unittest(
diff --git a/libc/test/src/math/smoke/NextDownTest.h b/libc/test/src/math/smoke/NextDownTest.h
new file mode 100644
index 00000000000000..101c3926bf42ed
--- /dev/null
+++ b/libc/test/src/math/smoke/NextDownTest.h
@@ -0,0 +1,55 @@
+//===-- Utility class to test different flavors of nextdown -----*- 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_NEXTDOWNTEST_H
+#define LLVM_LIBC_TEST_SRC_MATH_NEXTDOWNTEST_H
+
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+template <typename T>
+class NextDownTestTemplate : public LIBC_NAMESPACE::testing::Test {
+ using FPBits = typename LIBC_NAMESPACE::fputil::FPBits<T>;
+ using Sign = typename LIBC_NAMESPACE::fputil::Sign;
+
+ static constexpr T inf = FPBits::inf().get_val();
+ static constexpr T neg_inf = FPBits::inf(Sign::NEG).get_val();
+ static constexpr T zero = FPBits::zero().get_val();
+ static constexpr T neg_zero = FPBits::zero(Sign::NEG).get_val();
+ static constexpr T nan = FPBits::quiet_nan().get_val();
+
+ static constexpr T min_subnormal = FPBits::min_subnormal().get_val();
+ static constexpr T neg_min_subnormal =
+ FPBits::min_subnormal(Sign::NEG).get_val();
+ static constexpr T max_normal = FPBits::max_normal().get_val();
+ static constexpr T neg_max_normal = FPBits::max_normal(Sign::NEG).get_val();
+
+public:
+ typedef T (*NextDownFunc)(T);
+
+ void testNaN(NextDownFunc func) { ASSERT_FP_EQ(func(nan), nan); }
+
+ void testBoundaries(NextDownFunc func) {
+ ASSERT_FP_EQ(zero, func(min_subnormal));
+
+ ASSERT_FP_EQ(neg_min_subnormal, func(zero));
+ ASSERT_FP_EQ(neg_min_subnormal, func(neg_zero));
+
+ ASSERT_FP_EQ(neg_max_normal, func(neg_max_normal));
+ ASSERT_FP_EQ(neg_inf, func(neg_inf));
+
+ ASSERT_FP_EQ(max_normal, func(inf));
+ }
+};
+
+#define LIST_NEXTDOWN_TESTS(T, func) \
+ using LlvmLibcNextDownTest = NextDownTestTemplate<T>; \
+ TEST_F(LlvmLibcNextDownTest, TestNaN) { testNaN(&func); } \
+ TEST_F(LlvmLibcNextDownTest, TestBoundaries) { testBoundaries(&func); }
+
+#endif // LLVM_LIBC_TEST_SRC_MATH_NEXTDOWNTEST_H
diff --git a/libc/test/src/math/smoke/NextUpTest.h b/libc/test/src/math/smoke/NextUpTest.h
new file mode 100644
index 00000000000000..1db8f91cea4b4f
--- /dev/null
+++ b/libc/test/src/math/smoke/NextUpTest.h
@@ -0,0 +1,55 @@
+//===-- Utility class to test different flavors of nextup -------*- 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
+//
+//===------------------------------------------------...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/85431
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