[libc-commits] [libc] [libc][stdbit] implement stdc_trailing_ones (C23) (PR #80459)
Nick Desaulniers via libc-commits
libc-commits at lists.llvm.org
Tue Feb 6 06:52:32 PST 2024
https://github.com/nickdesaulniers updated https://github.com/llvm/llvm-project/pull/80459
>From 0e30138877ecf4920ba97240d8d23e7e86e6ad6f Mon Sep 17 00:00:00 2001
From: Nick Desaulniers <ndesaulniers at google.com>
Date: Thu, 1 Feb 2024 16:00:24 -0800
Subject: [PATCH] [libc][stdbit] implement stdc_trailing_ones (C23)
---
libc/config/linux/x86_64/entrypoints.txt | 5 +++++
libc/include/llvm-libc-macros/stdbit-macros.h | 22 +++++++++++++++++++
libc/spec/stdc.td | 7 +++++-
libc/src/stdbit/CMakeLists.txt | 1 +
libc/src/stdbit/stdc_trailing_ones_uc.cpp | 20 +++++++++++++++++
libc/src/stdbit/stdc_trailing_ones_uc.h | 18 +++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ui.cpp | 20 +++++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ui.h | 18 +++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ul.cpp | 20 +++++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ul.h | 18 +++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ull.cpp | 21 ++++++++++++++++++
libc/src/stdbit/stdc_trailing_ones_ull.h | 18 +++++++++++++++
libc/src/stdbit/stdc_trailing_ones_us.cpp | 20 +++++++++++++++++
libc/src/stdbit/stdc_trailing_ones_us.h | 18 +++++++++++++++
libc/test/include/stdbit_test.cpp | 13 +++++++++++
libc/test/src/stdbit/CMakeLists.txt | 1 +
.../src/stdbit/stdc_trailing_ones_uc_test.cpp | 21 ++++++++++++++++++
.../src/stdbit/stdc_trailing_ones_ui_test.cpp | 21 ++++++++++++++++++
.../src/stdbit/stdc_trailing_ones_ul_test.cpp | 21 ++++++++++++++++++
.../stdbit/stdc_trailing_ones_ull_test.cpp | 21 ++++++++++++++++++
.../src/stdbit/stdc_trailing_ones_us_test.cpp | 21 ++++++++++++++++++
21 files changed, 344 insertions(+), 1 deletion(-)
create mode 100644 libc/src/stdbit/stdc_trailing_ones_uc.cpp
create mode 100644 libc/src/stdbit/stdc_trailing_ones_uc.h
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ui.cpp
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ui.h
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ul.cpp
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ul.h
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ull.cpp
create mode 100644 libc/src/stdbit/stdc_trailing_ones_ull.h
create mode 100644 libc/src/stdbit/stdc_trailing_ones_us.cpp
create mode 100644 libc/src/stdbit/stdc_trailing_ones_us.h
create mode 100644 libc/test/src/stdbit/stdc_trailing_ones_uc_test.cpp
create mode 100644 libc/test/src/stdbit/stdc_trailing_ones_ui_test.cpp
create mode 100644 libc/test/src/stdbit/stdc_trailing_ones_ul_test.cpp
create mode 100644 libc/test/src/stdbit/stdc_trailing_ones_ull_test.cpp
create mode 100644 libc/test/src/stdbit/stdc_trailing_ones_us_test.cpp
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 2ac9a7444a1ecd..b35fc9fc6866b4 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -107,6 +107,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdbit.stdc_trailing_zeros_ui
libc.src.stdbit.stdc_trailing_zeros_ul
libc.src.stdbit.stdc_trailing_zeros_ull
+ libc.src.stdbit.stdc_trailing_ones_uc
+ libc.src.stdbit.stdc_trailing_ones_us
+ libc.src.stdbit.stdc_trailing_ones_ui
+ libc.src.stdbit.stdc_trailing_ones_ul
+ libc.src.stdbit.stdc_trailing_ones_ull
# stdlib.h entrypoints
libc.src.stdlib.abs
diff --git a/libc/include/llvm-libc-macros/stdbit-macros.h b/libc/include/llvm-libc-macros/stdbit-macros.h
index 15e391288357e5..d58ab7127cbdbf 100644
--- a/libc/include/llvm-libc-macros/stdbit-macros.h
+++ b/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -55,6 +55,21 @@ inline unsigned stdc_trailing_zeros(unsigned long x) {
inline unsigned stdc_trailing_zeros(unsigned long long x) {
return stdc_trailing_zeros_ull(x);
}
+inline unsigned stdc_trailing_ones(unsigned char x) {
+ return stdc_trailing_ones_uc(x);
+}
+inline unsigned stdc_trailing_ones(unsigned short x) {
+ return stdc_trailing_ones_us(x);
+}
+inline unsigned stdc_trailing_ones(unsigned x) {
+ return stdc_trailing_ones_ui(x);
+}
+inline unsigned stdc_trailing_ones(unsigned long x) {
+ return stdc_trailing_ones_ul(x);
+}
+inline unsigned stdc_trailing_ones(unsigned long long x) {
+ return stdc_trailing_ones_ull(x);
+}
#else
#define stdc_leading_zeros(x) \
_Generic((x), \
@@ -77,6 +92,13 @@ inline unsigned stdc_trailing_zeros(unsigned long long x) {
unsigned: stdc_trailing_zeros_ui, \
unsigned long: stdc_trailing_zeros_ul, \
unsigned long long: stdc_trailing_zeros_ull)(x)
+#define stdc_trailing_ones(x) \
+ _Generic((x), \
+ unsigned char: stdc_trailing_ones_uc, \
+ unsigned short: stdc_trailing_ones_us, \
+ unsigned: stdc_trailing_ones_ui, \
+ unsigned long: stdc_trailing_ones_ul, \
+ unsigned long long: stdc_trailing_ones_ull)(x)
#endif // __cplusplus
#endif // __LLVM_LIBC_MACROS_STDBIT_MACROS_H
diff --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index 3a162b0bc76f4e..ac7b7bcbeae476 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -796,7 +796,12 @@ def StdC : StandardSpec<"stdc"> {
FunctionSpec<"stdc_trailing_zeros_us", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedShortType>]>,
FunctionSpec<"stdc_trailing_zeros_ui", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedIntType>]>,
FunctionSpec<"stdc_trailing_zeros_ul", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongType>]>,
- FunctionSpec<"stdc_trailing_zeros_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>
+ FunctionSpec<"stdc_trailing_zeros_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>,
+ FunctionSpec<"stdc_trailing_ones_uc", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedCharType>]>,
+ FunctionSpec<"stdc_trailing_ones_us", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedShortType>]>,
+ FunctionSpec<"stdc_trailing_ones_ui", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedIntType>]>,
+ FunctionSpec<"stdc_trailing_ones_ul", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongType>]>,
+ FunctionSpec<"stdc_trailing_ones_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>
] // Functions
>;
diff --git a/libc/src/stdbit/CMakeLists.txt b/libc/src/stdbit/CMakeLists.txt
index 35df7f9c41ecbc..129621f1392894 100644
--- a/libc/src/stdbit/CMakeLists.txt
+++ b/libc/src/stdbit/CMakeLists.txt
@@ -2,6 +2,7 @@ set(prefixes
leading_zeros
leading_ones
trailing_zeros
+ trailing_ones
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/src/stdbit/stdc_trailing_ones_uc.cpp b/libc/src/stdbit/stdc_trailing_ones_uc.cpp
new file mode 100644
index 00000000000000..eabb21367e2858
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_uc.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_trailing_ones_uc ---------------------------===//
+//
+// 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/stdbit/stdc_trailing_ones_uc.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_trailing_ones_uc, (unsigned char value)) {
+ return static_cast<unsigned>(cpp::countr_one(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_trailing_ones_uc.h b/libc/src/stdbit/stdc_trailing_ones_uc.h
new file mode 100644
index 00000000000000..9736e21e1f280a
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_uc.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_trailing_ones_uc --------*- 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_STDBIT_STDC_TRAILING_ONES_UC_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UC_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_trailing_ones_uc(unsigned char value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UC_H
diff --git a/libc/src/stdbit/stdc_trailing_ones_ui.cpp b/libc/src/stdbit/stdc_trailing_ones_ui.cpp
new file mode 100644
index 00000000000000..87eb54fe5f026b
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ui.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_trailing_ones_ui ---------------------------===//
+//
+// 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/stdbit/stdc_trailing_ones_ui.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_trailing_ones_ui, (unsigned value)) {
+ return static_cast<unsigned>(cpp::countr_one(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_trailing_ones_ui.h b/libc/src/stdbit/stdc_trailing_ones_ui.h
new file mode 100644
index 00000000000000..aad7fcf0daf557
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ui.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_trailing_ones_ui --------*- 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_STDBIT_STDC_TRAILING_ONES_UI_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UI_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_trailing_ones_ui(unsigned value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UI_H
diff --git a/libc/src/stdbit/stdc_trailing_ones_ul.cpp b/libc/src/stdbit/stdc_trailing_ones_ul.cpp
new file mode 100644
index 00000000000000..6d358a21ac3371
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ul.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_trailing_ones_ul ---------------------------===//
+//
+// 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/stdbit/stdc_trailing_ones_ul.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_trailing_ones_ul, (unsigned long value)) {
+ return static_cast<unsigned>(cpp::countr_one(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_trailing_ones_ul.h b/libc/src/stdbit/stdc_trailing_ones_ul.h
new file mode 100644
index 00000000000000..80589501b1ed23
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ul.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_trailing_ones_ul --------*- 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_STDBIT_STDC_TRAILING_ONES_UL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_trailing_ones_ul(unsigned long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_UL_H
diff --git a/libc/src/stdbit/stdc_trailing_ones_ull.cpp b/libc/src/stdbit/stdc_trailing_ones_ull.cpp
new file mode 100644
index 00000000000000..fb5fffe07817d0
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ull.cpp
@@ -0,0 +1,21 @@
+//===-- Implementation of stdc_trailing_ones_ull --------------------------===//
+//
+// 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/stdbit/stdc_trailing_ones_ull.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_trailing_ones_ull,
+ (unsigned long long value)) {
+ return static_cast<unsigned>(cpp::countr_one(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_trailing_ones_ull.h b/libc/src/stdbit/stdc_trailing_ones_ull.h
new file mode 100644
index 00000000000000..3d3f0b306789ac
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_ull.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_trailing_ones_ull --------*- 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_STDBIT_STDC_TRAILING_ONES_ULL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_ULL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_trailing_ones_ull(unsigned long long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_ULL_H
diff --git a/libc/src/stdbit/stdc_trailing_ones_us.cpp b/libc/src/stdbit/stdc_trailing_ones_us.cpp
new file mode 100644
index 00000000000000..ee7ff4f78d489c
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_us.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_trailing_ones_us ---------------------------===//
+//
+// 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/stdbit/stdc_trailing_ones_us.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_trailing_ones_us, (unsigned short value)) {
+ return static_cast<unsigned>(cpp::countr_one(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_trailing_ones_us.h b/libc/src/stdbit/stdc_trailing_ones_us.h
new file mode 100644
index 00000000000000..b783cd22ad2deb
--- /dev/null
+++ b/libc/src/stdbit/stdc_trailing_ones_us.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_trailing_ones_us --------*- 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_STDBIT_STDC_TRAILING_ONES_US_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_US_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_trailing_ones_us(unsigned short value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_TRAILING_ONES_US_H
diff --git a/libc/test/include/stdbit_test.cpp b/libc/test/include/stdbit_test.cpp
index 858dc08bfd70c2..8d5d4c162938ec 100644
--- a/libc/test/include/stdbit_test.cpp
+++ b/libc/test/include/stdbit_test.cpp
@@ -38,6 +38,11 @@ unsigned stdc_trailing_zeros_us(unsigned short) noexcept { return 0xCBU; }
unsigned stdc_trailing_zeros_ui(unsigned) noexcept { return 0xCCU; }
unsigned stdc_trailing_zeros_ul(unsigned long) noexcept { return 0xCDU; }
unsigned stdc_trailing_zeros_ull(unsigned long long) noexcept { return 0xCFU; }
+unsigned stdc_trailing_ones_uc(unsigned char) noexcept { return 0xDAU; }
+unsigned stdc_trailing_ones_us(unsigned short) noexcept { return 0xDBU; }
+unsigned stdc_trailing_ones_ui(unsigned) noexcept { return 0xDCU; }
+unsigned stdc_trailing_ones_ul(unsigned long) noexcept { return 0xDDU; }
+unsigned stdc_trailing_ones_ull(unsigned long long) noexcept { return 0xDFU; }
}
#include "include/llvm-libc-macros/stdbit-macros.h"
@@ -65,3 +70,11 @@ TEST(LlvmLibcStdbitTest, TypeGenericMacroTrailingZeros) {
EXPECT_EQ(stdc_trailing_zeros(0UL), 0xCDU);
EXPECT_EQ(stdc_trailing_zeros(0ULL), 0xCFU);
}
+
+TEST(LlvmLibcStdbitTest, TypeGenericMacroTrailingOnes) {
+ EXPECT_EQ(stdc_trailing_ones(static_cast<unsigned char>(0U)), 0xDAU);
+ EXPECT_EQ(stdc_trailing_ones(static_cast<unsigned short>(0U)), 0xDBU);
+ EXPECT_EQ(stdc_trailing_ones(0U), 0xDCU);
+ EXPECT_EQ(stdc_trailing_ones(0UL), 0xDDU);
+ EXPECT_EQ(stdc_trailing_ones(0ULL), 0xDFU);
+}
diff --git a/libc/test/src/stdbit/CMakeLists.txt b/libc/test/src/stdbit/CMakeLists.txt
index 64d66037d0f6ca..fab5f67bbd9be4 100644
--- a/libc/test/src/stdbit/CMakeLists.txt
+++ b/libc/test/src/stdbit/CMakeLists.txt
@@ -4,6 +4,7 @@ set(prefixes
leading_zeros
leading_ones
trailing_zeros
+ trailing_ones
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/test/src/stdbit/stdc_trailing_ones_uc_test.cpp b/libc/test/src/stdbit/stdc_trailing_ones_uc_test.cpp
new file mode 100644
index 00000000000000..79d4e5b8b8032d
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_trailing_ones_uc_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_trailing_ones_uc -------------------------------===//
+//
+// 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/__support/CPP/limits.h"
+#include "src/stdbit/stdc_trailing_ones_uc.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcTrailingOnesUcTest, ALL) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_uc(UCHAR_MAX),
+ static_cast<unsigned>(UCHAR_WIDTH));
+}
+
+TEST(LlvmLibcStdcTrailingOnesUcTest, ZeroHot) {
+ for (unsigned i = 0U; i != UCHAR_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_uc(~(1U << i)), i);
+}
diff --git a/libc/test/src/stdbit/stdc_trailing_ones_ui_test.cpp b/libc/test/src/stdbit/stdc_trailing_ones_ui_test.cpp
new file mode 100644
index 00000000000000..51e49f1e9e5fef
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_trailing_ones_ui_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_trailing_ones_ui -------------------------------===//
+//
+// 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/__support/CPP/limits.h"
+#include "src/stdbit/stdc_trailing_ones_ui.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcTrailingOnesUiTest, ALL) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ui(UINT_MAX),
+ static_cast<unsigned>(UINT_WIDTH));
+}
+
+TEST(LlvmLibcStdcTrailingOnesUiTest, ZeroHot) {
+ for (unsigned i = 0U; i != UINT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ui(~(1U << i)), i);
+}
diff --git a/libc/test/src/stdbit/stdc_trailing_ones_ul_test.cpp b/libc/test/src/stdbit/stdc_trailing_ones_ul_test.cpp
new file mode 100644
index 00000000000000..2aebe2e814ca9f
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_trailing_ones_ul_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_trailing_ones_ul -------------------------------===//
+//
+// 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/__support/CPP/limits.h"
+#include "src/stdbit/stdc_trailing_ones_ul.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcTrailingOnesUlTest, ALL) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ul(ULONG_MAX),
+ static_cast<unsigned>(ULONG_WIDTH));
+}
+
+TEST(LlvmLibcStdcTrailingOnesUlTest, ZeroHot) {
+ for (unsigned i = 0U; i != ULONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ul(~(1UL << i)), i);
+}
diff --git a/libc/test/src/stdbit/stdc_trailing_ones_ull_test.cpp b/libc/test/src/stdbit/stdc_trailing_ones_ull_test.cpp
new file mode 100644
index 00000000000000..38c5100efc06e5
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_trailing_ones_ull_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_trailing_ones_ull ------------------------------===//
+//
+// 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/__support/CPP/limits.h"
+#include "src/stdbit/stdc_trailing_ones_ull.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcTrailingOnesUllTest, ALL) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ull(ULLONG_MAX),
+ static_cast<unsigned>(ULLONG_WIDTH));
+}
+
+TEST(LlvmLibcStdcTrailingOnesUllTest, ZeroHot) {
+ for (unsigned i = 0U; i != ULLONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_ull(~(1ULL << i)), i);
+}
diff --git a/libc/test/src/stdbit/stdc_trailing_ones_us_test.cpp b/libc/test/src/stdbit/stdc_trailing_ones_us_test.cpp
new file mode 100644
index 00000000000000..7ab15743ed1e04
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_trailing_ones_us_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_trailing_ones_us -------------------------------===//
+//
+// 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/__support/CPP/limits.h"
+#include "src/stdbit/stdc_trailing_ones_us.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcTrailingOnesUsTest, ALL) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_us(USHRT_MAX),
+ static_cast<unsigned>(USHRT_WIDTH));
+}
+
+TEST(LlvmLibcStdcTrailingOnesUsTest, ZeroHot) {
+ for (unsigned i = 0U; i != USHRT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_trailing_ones_us(~(1U << i)), i);
+}
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