https://github.com/krishna2803 created
https://github.com/llvm/llvm-project/pull/153993
This PR adds the following basic math functions for BFloat16 type along with
the tests:
- nextafterbf16
- nextdownbf16
- nexttowardbf16
- nextupbf16
>From 4a80312010e3adaff8873a40831e74d393a1d71c Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81...@gmail.com>
Date: Sun, 17 Aug 2025 05:59:39 +0530
Subject: [PATCH 1/4] feat: implement next{after,down,toward,up}bf16 math
functions
Signed-off-by: Krishna Pandey <kpandey81...@gmail.com>
---
libc/src/math/CMakeLists.txt | 4 ++
libc/src/math/generic/CMakeLists.txt | 56 ++++++++++++++++++++++++
libc/src/math/generic/nextafterbf16.cpp | 21 +++++++++
libc/src/math/generic/nextdownbf16.cpp | 21 +++++++++
libc/src/math/generic/nexttowardbf16.cpp | 22 ++++++++++
libc/src/math/generic/nextupbf16.cpp | 21 +++++++++
libc/src/math/nextafterbf16.h | 21 +++++++++
libc/src/math/nextdownbf16.h | 21 +++++++++
libc/src/math/nexttowardbf16.h | 21 +++++++++
libc/src/math/nextupbf16.h | 21 +++++++++
10 files changed, 229 insertions(+)
create mode 100644 libc/src/math/generic/nextafterbf16.cpp
create mode 100644 libc/src/math/generic/nextdownbf16.cpp
create mode 100644 libc/src/math/generic/nexttowardbf16.cpp
create mode 100644 libc/src/math/generic/nextupbf16.cpp
create mode 100644 libc/src/math/nextafterbf16.h
create mode 100644 libc/src/math/nextdownbf16.h
create mode 100644 libc/src/math/nexttowardbf16.h
create mode 100644 libc/src/math/nextupbf16.h
diff --git a/libc/src/math/CMakeLists.txt b/libc/src/math/CMakeLists.txt
index f94120272ce66..3843247c4fa5b 100644
--- a/libc/src/math/CMakeLists.txt
+++ b/libc/src/math/CMakeLists.txt
@@ -431,23 +431,27 @@ add_math_entrypoint_object(nextafterf)
add_math_entrypoint_object(nextafterl)
add_math_entrypoint_object(nextafterf16)
add_math_entrypoint_object(nextafterf128)
+add_math_entrypoint_object(nextafterbf16)
add_math_entrypoint_object(nexttoward)
add_math_entrypoint_object(nexttowardf)
add_math_entrypoint_object(nexttowardl)
add_math_entrypoint_object(nexttowardf16)
+add_math_entrypoint_object(nexttowardbf16)
add_math_entrypoint_object(nextdown)
add_math_entrypoint_object(nextdownf)
add_math_entrypoint_object(nextdownl)
add_math_entrypoint_object(nextdownf16)
add_math_entrypoint_object(nextdownf128)
+add_math_entrypoint_object(nextdownbf16)
add_math_entrypoint_object(nextup)
add_math_entrypoint_object(nextupf)
add_math_entrypoint_object(nextupl)
add_math_entrypoint_object(nextupf16)
add_math_entrypoint_object(nextupf128)
+add_math_entrypoint_object(nextupbf16)
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 1608bed87cb6b..822da74d7597e 100644
--- a/libc/src/math/generic/CMakeLists.txt
+++ b/libc/src/math/generic/CMakeLists.txt
@@ -3496,6 +3496,20 @@ add_entrypoint_object(
libc.src.__support.FPUtil.manipulation_functions
)
+add_entrypoint_object(
+ nextafterbf16
+ SRCS
+ nextafterbf16.cpp
+ HDRS
+ ../nextafterbf16.h
+ DEPENDS
+ libc.src.__support.common
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.macros.config
+ libc.src.__support.macros.properties.types
+)
+
add_entrypoint_object(
nexttoward
SRCS
@@ -3537,6 +3551,20 @@ add_entrypoint_object(
libc.src.__support.FPUtil.manipulation_functions
)
+add_entrypoint_object(
+ nexttowardbf16
+ SRCS
+ nexttowardbf16.cpp
+ HDRS
+ ../nexttowardbf16.h
+ DEPENDS
+ libc.src.__support.common
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.macros.config
+ libc.src.__support.macros.properties.types
+)
+
add_entrypoint_object(
nextdown
SRCS
@@ -3589,6 +3617,20 @@ add_entrypoint_object(
libc.src.__support.FPUtil.manipulation_functions
)
+add_entrypoint_object(
+ nextdownbf16
+ SRCS
+ nextdownbf16.cpp
+ HDRS
+ ../nextdownbf16.h
+ DEPENDS
+ libc.src.__support.common
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.macros.config
+ libc.src.__support.macros.properties.types
+)
+
add_entrypoint_object(
nextup
SRCS
@@ -3641,6 +3683,20 @@ add_entrypoint_object(
libc.src.__support.FPUtil.manipulation_functions
)
+add_entrypoint_object(
+ nextupbf16
+ SRCS
+ nextupbf16.cpp
+ HDRS
+ ../nextupbf16.h
+ DEPENDS
+ libc.src.__support.common
+ libc.src.__support.FPUtil.bfloat16
+ libc.src.__support.FPUtil.manipulation_functions
+ libc.src.__support.macros.config
+ libc.src.__support.macros.properties.types
+)
+
add_entrypoint_object(
fmod
SRCS
diff --git a/libc/src/math/generic/nextafterbf16.cpp
b/libc/src/math/generic/nextafterbf16.cpp
new file mode 100644
index 0000000000000..e21a2dcb3d664
--- /dev/null
+++ b/libc/src/math/generic/nextafterbf16.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of nextafterbf16 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/nextafterbf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, nextafterbf16, (bfloat16 x, bfloat16 y)) {
+ return fputil::nextafter(x, y);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/generic/nextdownbf16.cpp
b/libc/src/math/generic/nextdownbf16.cpp
new file mode 100644
index 0000000000000..2115df95ff072
--- /dev/null
+++ b/libc/src/math/generic/nextdownbf16.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of nextdownbf16 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/nextdownbf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, nextdownbf16, (bfloat16 x)) {
+ return fputil::nextupdown</*IsDown=*/true>(x);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/generic/nexttowardbf16.cpp
b/libc/src/math/generic/nexttowardbf16.cpp
new file mode 100644
index 0000000000000..3deab87575939
--- /dev/null
+++ b/libc/src/math/generic/nexttowardbf16.cpp
@@ -0,0 +1,22 @@
+//===-- Implementation of nexttowardbf16 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/nexttowardbf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, nexttowardbf16, (bfloat16 x, long double y)) {
+ // nextafter<T, U> where T != U is nexttoward
+ return fputil::nextafter(x, y);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/generic/nextupbf16.cpp
b/libc/src/math/generic/nextupbf16.cpp
new file mode 100644
index 0000000000000..147ce37477d9f
--- /dev/null
+++ b/libc/src/math/generic/nextupbf16.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of nextupbf16 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/nextupbf16.h"
+#include "src/__support/FPUtil/ManipulationFunctions.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(bfloat16, nextupbf16, (bfloat16 x)) {
+ return fputil::nextupdown</*IsDown=*/false>(x);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/math/nextafterbf16.h b/libc/src/math/nextafterbf16.h
new file mode 100644
index 0000000000000..f962c7c51e5cd
--- /dev/null
+++ b/libc/src/math/nextafterbf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for nextafterbf16 -----------------*- 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_NEXTAFTERBF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTAFTERBF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 nextafterbf16(bfloat16 x, bfloat16 y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTAFTERBF16_H
diff --git a/libc/src/math/nextdownbf16.h b/libc/src/math/nextdownbf16.h
new file mode 100644
index 0000000000000..36b0cd7cb9626
--- /dev/null
+++ b/libc/src/math/nextdownbf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for nextdownbf16 ------------------*- 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_NEXTDOWNBF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTDOWNBF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 nextdownbf16(bfloat16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTDOWNBF16_H
diff --git a/libc/src/math/nexttowardbf16.h b/libc/src/math/nexttowardbf16.h
new file mode 100644
index 0000000000000..930abf858ef51
--- /dev/null
+++ b/libc/src/math/nexttowardbf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for nexttowardbf16 ----------------*- 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_NEXTTOWARDBF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTTOWARDBF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 nexttowardbf16(bfloat16 x, long double y);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTTOWARDBF16_H
diff --git a/libc/src/math/nextupbf16.h b/libc/src/math/nextupbf16.h
new file mode 100644
index 0000000000000..872de84338d95
--- /dev/null
+++ b/libc/src/math/nextupbf16.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for nextupbf16 --------------------*- 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_NEXTUPBF16_H
+#define LLVM_LIBC_SRC_MATH_NEXTUPBF16_H
+
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/properties/types.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+bfloat16 nextupbf16(bfloat16 x);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_MATH_NEXTUPBF16_H
>From 446e63718e21f90dbfea74dcbc699c1f4c08334c Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81...@gmail.com>
Date: Sun, 17 Aug 2025 06:00:01 +0530
Subject: [PATCH 2/4] chore: add smoke tests for next{after,down,toward,up}bf16
math functions
Signed-off-by: Krishna Pandey <kpandey81...@gmail.com>
---
libc/test/src/math/smoke/CMakeLists.txt | 52 +++++++++++++++++++
libc/test/src/math/smoke/NextAfterTest.h | 43 ++++++++-------
libc/test/src/math/smoke/NextTowardTest.h | 4 +-
.../src/math/smoke/nextafterbf16_test.cpp | 14 +++++
.../test/src/math/smoke/nextdownbf16_test.cpp | 14 +++++
.../src/math/smoke/nexttowardbf16_test.cpp | 14 +++++
libc/test/src/math/smoke/nextupbf16_test.cpp | 14 +++++
7 files changed, 133 insertions(+), 22 deletions(-)
create mode 100644 libc/test/src/math/smoke/nextafterbf16_test.cpp
create mode 100644 libc/test/src/math/smoke/nextdownbf16_test.cpp
create mode 100644 libc/test/src/math/smoke/nexttowardbf16_test.cpp
create mode 100644 libc/test/src/math/smoke/nextupbf16_test.cpp
diff --git a/libc/test/src/math/smoke/CMakeLists.txt
b/libc/test/src/math/smoke/CMakeLists.txt
index 694467e19d47c..40481a711bade 100644
--- a/libc/test/src/math/smoke/CMakeLists.txt
+++ b/libc/test/src/math/smoke/CMakeLists.txt
@@ -3660,6 +3660,19 @@ add_fp_unittest(
libc.src.__support.FPUtil.fp_bits
)
+add_fp_unittest(
+ nextafterbf16_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextafterbf16_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.src.math.nextafterbf16
+ libc.src.__support.FPUtil.bfloat16
+)
+
# FIXME: These tests are currently spurious for the GPU.
if(NOT LIBC_TARGET_OS_IS_GPU)
add_fp_unittest(
@@ -3727,6 +3740,19 @@ add_fp_unittest(
libc.src.__support.FPUtil.fp_bits
)
+add_fp_unittest(
+ nexttowardbf16_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nexttowardbf16_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.src.math.nexttowardbf16
+ libc.src.__support.FPUtil.bfloat16
+)
+
add_fp_unittest(
nextdown_test
SUITE
@@ -3787,6 +3813,19 @@ add_fp_unittest(
libc.src.math.nextdownf128
)
+add_fp_unittest(
+ nextdownbf16_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextdownbf16_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.src.math.nextdownbf16
+ libc.src.__support.FPUtil.bfloat16
+)
+
add_fp_unittest(
nextup_test
SUITE
@@ -3847,6 +3886,19 @@ add_fp_unittest(
libc.src.math.nextupf128
)
+add_fp_unittest(
+ nextupbf16_test
+ SUITE
+ libc-math-smoke-tests
+ SRCS
+ nextupbf16_test.cpp
+ HDRS
+ NextUpTest.h
+ DEPENDS
+ libc.src.math.nextupbf16
+ libc.src.__support.FPUtil.bfloat16
+)
+
# 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/NextAfterTest.h
b/libc/test/src/math/smoke/NextAfterTest.h
index be27c9f188a72..b7e59f7cd8cfd 100644
--- a/libc/test/src/math/smoke/NextAfterTest.h
+++ b/libc/test/src/math/smoke/NextAfterTest.h
@@ -12,6 +12,7 @@
#include "src/__support/CPP/bit.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/FPUtil/FPBits.h"
+#include "src/__support/sign.h"
#include "test/UnitTest/FEnvSafeTest.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
@@ -42,6 +43,8 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
const T neg_inf = FPBits::inf(Sign::NEG).get_val();
const T zero = FPBits::zero(Sign::POS).get_val();
const T neg_zero = FPBits::zero(Sign::NEG).get_val();
+ const T one = FPBits::one(Sign::POS).get_val();
+ const T neg_one = FPBits::one(Sign::NEG).get_val();
const T nan = FPBits::quiet_nan().get_val();
static constexpr StorageType min_subnormal =
@@ -55,8 +58,8 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
typedef T (*NextAfterFunc)(T, T);
void testNaN(NextAfterFunc func) {
- ASSERT_FP_EQ(func(nan, 0), nan);
- ASSERT_FP_EQ(func(0, nan), nan);
+ ASSERT_FP_EQ(func(nan, zero), nan);
+ ASSERT_FP_EQ(func(zero, nan), nan);
}
void testBoundaries(NextAfterFunc func) {
@@ -65,68 +68,68 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
// 'from' is zero|neg_zero.
T x = zero;
- T result = func(x, T(1));
+ T result = func(x, one);
StorageType expected_bits = 1;
T expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
- result = func(x, T(-1));
+ result = func(x, neg_one);
expected_bits = FPBits::SIGN_MASK + 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
x = neg_zero;
- result = func(x, 1);
+ result = func(x, one);
expected_bits = 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
- result = func(x, -1);
+ result = func(x, neg_one);
expected_bits = FPBits::SIGN_MASK + 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
// 'from' is max subnormal value.
x = LIBC_NAMESPACE::cpp::bit_cast<T>(max_subnormal);
- result = func(x, 1);
+ result = func(x, one);
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(min_normal);
ASSERT_FP_EQ(result, expected);
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = max_subnormal - 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
x = -x;
- result = func(x, -1);
+ result = func(x, neg_one);
expected_bits = FPBits::SIGN_MASK + min_normal;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ(result, expected);
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = FPBits::SIGN_MASK + max_subnormal - 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
// 'from' is min subnormal value.
x = LIBC_NAMESPACE::cpp::bit_cast<T>(min_subnormal);
- result = func(x, 1);
+ result = func(x, one);
expected_bits = min_subnormal + 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
- ASSERT_FP_EQ_WITH_UNDERFLOW(func(x, 0), zero);
+ ASSERT_FP_EQ_WITH_UNDERFLOW(func(x, zero), zero);
x = -x;
- result = func(x, -1);
+ result = func(x, neg_one);
expected_bits = FPBits::SIGN_MASK + min_subnormal + 1;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
- ASSERT_FP_EQ_WITH_UNDERFLOW(func(x, 0), T(-0.0));
+ ASSERT_FP_EQ_WITH_UNDERFLOW(func(x, zero), neg_zero);
// 'from' is min normal.
x = LIBC_NAMESPACE::cpp::bit_cast<T>(min_normal);
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = max_subnormal;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
@@ -137,7 +140,7 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
ASSERT_FP_EQ(result, expected);
x = -x;
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = FPBits::SIGN_MASK + max_subnormal;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ_WITH_UNDERFLOW(result, expected);
@@ -157,14 +160,14 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
// 'from' is infinity.
x = inf;
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = max_normal;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ(result, expected);
ASSERT_FP_EQ(func(x, inf), inf);
x = neg_inf;
- result = func(x, 0);
+ result = func(x, zero);
expected_bits = FPBits::SIGN_MASK + max_normal;
expected = LIBC_NAMESPACE::cpp::bit_cast<T>(expected_bits);
ASSERT_FP_EQ(result, expected);
@@ -172,7 +175,7 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
// 'from' is a power of 2.
x = T(32.0);
- result = func(x, 0);
+ result = func(x, zero);
FPBits x_bits = FPBits(x);
FPBits result_bits = FPBits(result);
ASSERT_EQ(result_bits.get_biased_exponent(),
@@ -187,7 +190,7 @@ class NextAfterTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
x = -x;
- result = func(x, 0);
+ result = func(x, zero);
result_bits = FPBits(result);
ASSERT_EQ(result_bits.get_biased_exponent(),
uint16_t(x_bits.get_biased_exponent() - 1));
diff --git a/libc/test/src/math/smoke/NextTowardTest.h
b/libc/test/src/math/smoke/NextTowardTest.h
index d2f352cdcbdf7..43e71c6a2d8f6 100644
--- a/libc/test/src/math/smoke/NextTowardTest.h
+++ b/libc/test/src/math/smoke/NextTowardTest.h
@@ -62,8 +62,8 @@ class NextTowardTestTemplate : public
LIBC_NAMESPACE::testing::FEnvSafeTest {
typedef T (*NextTowardFunc)(T, long double);
void testNaN(NextTowardFunc func) {
- ASSERT_FP_EQ(func(nan, 0), nan);
- ASSERT_FP_EQ(func(0, to_nan), nan);
+ ASSERT_FP_EQ(func(nan, to_zero), nan);
+ ASSERT_FP_EQ(func(zero, to_nan), nan);
}
void testBoundaries(NextTowardFunc func) {
diff --git a/libc/test/src/math/smoke/nextafterbf16_test.cpp
b/libc/test/src/math/smoke/nextafterbf16_test.cpp
new file mode 100644
index 0000000000000..b73a3cbef0b74
--- /dev/null
+++ b/libc/test/src/math/smoke/nextafterbf16_test.cpp
@@ -0,0 +1,14 @@
+//===-- Unittests for nextafterbf16
---------------------------------------===//
+//
+// 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 "NextAfterTest.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/nextafterbf16.h"
+
+LIST_NEXTAFTER_TESTS(bfloat16, LIBC_NAMESPACE::nextafterbf16)
diff --git a/libc/test/src/math/smoke/nextdownbf16_test.cpp
b/libc/test/src/math/smoke/nextdownbf16_test.cpp
new file mode 100644
index 0000000000000..300206461e2de
--- /dev/null
+++ b/libc/test/src/math/smoke/nextdownbf16_test.cpp
@@ -0,0 +1,14 @@
+//===-- Unittests for nextdownbf16
----------------------------------------===//
+//
+// 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 "NextDownTest.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/nextdownbf16.h"
+
+LIST_NEXTDOWN_TESTS(bfloat16, LIBC_NAMESPACE::nextdownbf16)
diff --git a/libc/test/src/math/smoke/nexttowardbf16_test.cpp
b/libc/test/src/math/smoke/nexttowardbf16_test.cpp
new file mode 100644
index 0000000000000..c1f35fcb96ef6
--- /dev/null
+++ b/libc/test/src/math/smoke/nexttowardbf16_test.cpp
@@ -0,0 +1,14 @@
+//===-- Unittests for nexttowardbf16
--------------------------------------===//
+//
+// 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 "NextTowardTest.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/nexttowardbf16.h"
+
+LIST_NEXTTOWARD_TESTS(bfloat16, LIBC_NAMESPACE::nexttowardbf16)
diff --git a/libc/test/src/math/smoke/nextupbf16_test.cpp
b/libc/test/src/math/smoke/nextupbf16_test.cpp
new file mode 100644
index 0000000000000..49ad2f70b12a8
--- /dev/null
+++ b/libc/test/src/math/smoke/nextupbf16_test.cpp
@@ -0,0 +1,14 @@
+//===-- Unittests for nextupbf16
------------------------------------------===//
+//
+// 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 "NextUpTest.h"
+
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/nextupbf16.h"
+
+LIST_NEXTUP_TESTS(bfloat16, LIBC_NAMESPACE::nextupbf16)
>From a98b9281d87906165b1b7ade5591335dcba0efc5 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81...@gmail.com>
Date: Sun, 17 Aug 2025 06:00:15 +0530
Subject: [PATCH 3/4] chore: update entrypoints
Signed-off-by: Krishna Pandey <kpandey81...@gmail.com>
---
libc/config/baremetal/aarch64/entrypoints.txt | 4 ++++
libc/config/baremetal/arm/entrypoints.txt | 4 ++++
libc/config/baremetal/riscv/entrypoints.txt | 4 ++++
libc/config/darwin/aarch64/entrypoints.txt | 4 ++++
libc/config/darwin/x86_64/entrypoints.txt | 4 ++++
libc/config/gpu/amdgpu/entrypoints.txt | 4 ++++
libc/config/gpu/nvptx/entrypoints.txt | 4 ++++
libc/config/linux/aarch64/entrypoints.txt | 4 ++++
libc/config/linux/arm/entrypoints.txt | 4 ++++
libc/config/linux/riscv/entrypoints.txt | 4 ++++
libc/config/linux/x86_64/entrypoints.txt | 4 ++++
libc/config/windows/entrypoints.txt | 4 ++++
12 files changed, 48 insertions(+)
diff --git a/libc/config/baremetal/aarch64/entrypoints.txt
b/libc/config/baremetal/aarch64/entrypoints.txt
index c2710429b3cfd..26ee82d99192f 100644
--- a/libc/config/baremetal/aarch64/entrypoints.txt
+++ b/libc/config/baremetal/aarch64/entrypoints.txt
@@ -787,6 +787,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/baremetal/arm/entrypoints.txt
b/libc/config/baremetal/arm/entrypoints.txt
index 6e5389d542f80..00025d324fc2c 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -790,6 +790,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/baremetal/riscv/entrypoints.txt
b/libc/config/baremetal/riscv/entrypoints.txt
index 76da24d2cc876..c0ab0cf903c41 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -790,6 +790,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/darwin/aarch64/entrypoints.txt
b/libc/config/darwin/aarch64/entrypoints.txt
index 5bfd6c863fabb..cd81756770ed4 100644
--- a/libc/config/darwin/aarch64/entrypoints.txt
+++ b/libc/config/darwin/aarch64/entrypoints.txt
@@ -620,6 +620,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/darwin/x86_64/entrypoints.txt
b/libc/config/darwin/x86_64/entrypoints.txt
index 27d214d06cd0b..3aa54e027a42d 100644
--- a/libc/config/darwin/x86_64/entrypoints.txt
+++ b/libc/config/darwin/x86_64/entrypoints.txt
@@ -263,6 +263,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/gpu/amdgpu/entrypoints.txt
b/libc/config/gpu/amdgpu/entrypoints.txt
index bc75956738e5a..3b42c0fd71547 100644
--- a/libc/config/gpu/amdgpu/entrypoints.txt
+++ b/libc/config/gpu/amdgpu/entrypoints.txt
@@ -646,6 +646,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/gpu/nvptx/entrypoints.txt
b/libc/config/gpu/nvptx/entrypoints.txt
index c9688284df16c..b569327409849 100644
--- a/libc/config/gpu/nvptx/entrypoints.txt
+++ b/libc/config/gpu/nvptx/entrypoints.txt
@@ -647,6 +647,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/linux/aarch64/entrypoints.txt
b/libc/config/linux/aarch64/entrypoints.txt
index e42bbb14ec119..4058e7155f34a 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -874,6 +874,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/linux/arm/entrypoints.txt
b/libc/config/linux/arm/entrypoints.txt
index 60fc953c2b9f4..9002bd12d6733 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -490,6 +490,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/linux/riscv/entrypoints.txt
b/libc/config/linux/riscv/entrypoints.txt
index 1a03683d72e61..77d5bae188a3c 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -893,6 +893,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/linux/x86_64/entrypoints.txt
b/libc/config/linux/x86_64/entrypoints.txt
index 9b4946b883626..b811fe79c174d 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -925,6 +925,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
diff --git a/libc/config/windows/entrypoints.txt
b/libc/config/windows/entrypoints.txt
index b97e893567038..ec2fde253e898 100644
--- a/libc/config/windows/entrypoints.txt
+++ b/libc/config/windows/entrypoints.txt
@@ -336,6 +336,10 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_numbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
+ libc.src.math.nextafterbf16
+ libc.src.math.nextdownbf16
+ libc.src.math.nexttowardbf16
+ libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.truncbf16
>From 12f1923f5e1e3681a203f546aeefaaa38ea3fe58 Mon Sep 17 00:00:00 2001
From: Krishna Pandey <kpandey81...@gmail.com>
Date: Sun, 17 Aug 2025 06:00:38 +0530
Subject: [PATCH 4/4] docs: add next{after,down,toward,up}bf16 math functions
Signed-off-by: Krishna Pandey <kpandey81...@gmail.com>
---
libc/docs/headers/math/index.rst | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libc/docs/headers/math/index.rst b/libc/docs/headers/math/index.rst
index 754c1a55cf449..591295659c3d4 100644
--- a/libc/docs/headers/math/index.rst
+++ b/libc/docs/headers/math/index.rst
@@ -215,13 +215,13 @@ Basic Operations
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| nearbyint | |check| | |check| | |check|
| |check| | |check| | |
7.12.9.3 | F.10.6.3 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| nextafter | |check| | |check| | |check|
| |check| | |check| | |
7.12.11.3 | F.10.8.3 |
+| nextafter | |check| | |check| | |check|
| |check| | |check| | |check| |
7.12.11.3 | F.10.8.3 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| nextdown | |check| | |check| | |check|
| |check| | |check| | |
7.12.11.6 | F.10.8.6 |
+| nextdown | |check| | |check| | |check|
| |check| | |check| | |check| |
7.12.11.6 | F.10.8.6 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| nexttoward | |check| | |check| | |check|
| |check| | N/A | |
7.12.11.4 | F.10.8.4 |
+| nexttoward | |check| | |check| | |check|
| |check| | N/A | |check| |
7.12.11.4 | F.10.8.4 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| nextup | |check| | |check| | |check|
| |check| | |check| | |
7.12.11.5 | F.10.8.5 |
+| nextup | |check| | |check| | |check|
| |check| | |check| | |check| |
7.12.11.5 | F.10.8.5 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| remainder | |check| | |check| | |check|
| |check| | |check| | |
7.12.10.2 | F.10.7.2 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
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