[libc-commits] [libc] d8406d4 - [libc][stdbit] implement stdc_count_ones (C23) (#82444)
via libc-commits
libc-commits at lists.llvm.org
Mon Feb 26 09:25:28 PST 2024
Author: Nick Desaulniers
Date: 2024-02-26T09:25:24-08:00
New Revision: d8406d48a8c94f88613e5613a7e0d6526a520428
URL: https://github.com/llvm/llvm-project/commit/d8406d48a8c94f88613e5613a7e0d6526a520428
DIFF: https://github.com/llvm/llvm-project/commit/d8406d48a8c94f88613e5613a7e0d6526a520428.diff
LOG: [libc][stdbit] implement stdc_count_ones (C23) (#82444)
Added:
libc/src/stdbit/stdc_count_ones_uc.cpp
libc/src/stdbit/stdc_count_ones_uc.h
libc/src/stdbit/stdc_count_ones_ui.cpp
libc/src/stdbit/stdc_count_ones_ui.h
libc/src/stdbit/stdc_count_ones_ul.cpp
libc/src/stdbit/stdc_count_ones_ul.h
libc/src/stdbit/stdc_count_ones_ull.cpp
libc/src/stdbit/stdc_count_ones_ull.h
libc/src/stdbit/stdc_count_ones_us.cpp
libc/src/stdbit/stdc_count_ones_us.h
libc/test/src/stdbit/stdc_count_ones_uc_test.cpp
libc/test/src/stdbit/stdc_count_ones_ui_test.cpp
libc/test/src/stdbit/stdc_count_ones_ul_test.cpp
libc/test/src/stdbit/stdc_count_ones_ull_test.cpp
libc/test/src/stdbit/stdc_count_ones_us_test.cpp
Modified:
libc/config/linux/x86_64/entrypoints.txt
libc/docs/stdbit.rst
libc/include/llvm-libc-macros/stdbit-macros.h
libc/spec/stdc.td
libc/src/stdbit/CMakeLists.txt
libc/test/include/stdbit_test.cpp
libc/test/src/stdbit/CMakeLists.txt
Removed:
################################################################################
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 91e1bd73ec73fb..f2a224d45bbae7 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -137,6 +137,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdbit.stdc_count_zeros_ui
libc.src.stdbit.stdc_count_zeros_ul
libc.src.stdbit.stdc_count_zeros_ull
+ libc.src.stdbit.stdc_count_ones_uc
+ libc.src.stdbit.stdc_count_ones_us
+ libc.src.stdbit.stdc_count_ones_ui
+ libc.src.stdbit.stdc_count_ones_ul
+ libc.src.stdbit.stdc_count_ones_ull
# stdlib.h entrypoints
libc.src.stdlib.abs
diff --git a/libc/docs/stdbit.rst b/libc/docs/stdbit.rst
index 3597cdc3432fd7..0308caeb929321 100644
--- a/libc/docs/stdbit.rst
+++ b/libc/docs/stdbit.rst
@@ -76,11 +76,11 @@ stdc_count_zeros_us |check|
stdc_count_zeros_ui |check|
stdc_count_zeros_ul |check|
stdc_count_zeros_ull |check|
-stdc_count_ones_uc
-stdc_count_ones_us
-stdc_count_ones_ui
-stdc_count_ones_ul
-stdc_count_ones_ull
+stdc_count_ones_uc |check|
+stdc_count_ones_us |check|
+stdc_count_ones_ui |check|
+stdc_count_ones_ul |check|
+stdc_count_ones_ull |check|
stdc_has_single_bit_uc
stdc_has_single_bit_us
stdc_has_single_bit_ui
@@ -123,7 +123,7 @@ stdc_first_leading_one |check|
stdc_first_trailing_zero |check|
stdc_first_trailing_one |check|
stdc_count_zeros |check|
-stdc_count_ones
+stdc_count_ones |check|
stdc_has_single_bit
stdc_bit_width
stdc_bit_floor
diff --git a/libc/include/llvm-libc-macros/stdbit-macros.h b/libc/include/llvm-libc-macros/stdbit-macros.h
index 3b2aa9b932b833..5ee152e105f772 100644
--- a/libc/include/llvm-libc-macros/stdbit-macros.h
+++ b/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -144,6 +144,19 @@ inline unsigned stdc_count_zeros(unsigned long x) {
inline unsigned stdc_count_zeros(unsigned long long x) {
return stdc_count_zeros_ull(x);
}
+inline unsigned stdc_count_ones(unsigned char x) {
+ return stdc_count_ones_uc(x);
+}
+inline unsigned stdc_count_ones(unsigned short x) {
+ return stdc_count_ones_us(x);
+}
+inline unsigned stdc_count_ones(unsigned x) { return stdc_count_ones_ui(x); }
+inline unsigned stdc_count_ones(unsigned long x) {
+ return stdc_count_ones_ul(x);
+}
+inline unsigned stdc_count_ones(unsigned long long x) {
+ return stdc_count_ones_ull(x);
+}
#else
#define stdc_leading_zeros(x) \
_Generic((x), \
@@ -208,6 +221,13 @@ inline unsigned stdc_count_zeros(unsigned long long x) {
unsigned: stdc_count_zeros_ui, \
unsigned long: stdc_count_zeros_ul, \
unsigned long long: stdc_count_zeros_ull)(x)
+#define stdc_count_ones(x) \
+ _Generic((x), \
+ unsigned char: stdc_count_ones_uc, \
+ unsigned short: stdc_count_ones_us, \
+ unsigned: stdc_count_ones_ui, \
+ unsigned long: stdc_count_ones_ul, \
+ unsigned long long: stdc_count_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 523a08c6a8c3cc..6b292588b6c7ae 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -791,7 +791,8 @@ def StdC : StandardSpec<"stdc"> {
Macro<"stdc_first_leading_one">,
Macro<"stdc_first_trailing_zero">,
Macro<"stdc_first_trailing_one">,
- Macro<"stdc_count_zeros">
+ Macro<"stdc_count_zeros">,
+ Macro<"stdc_count_ones">
], // Macros
[], // Types
[], // Enumerations
@@ -835,7 +836,12 @@ def StdC : StandardSpec<"stdc"> {
FunctionSpec<"stdc_count_zeros_us", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedShortType>]>,
FunctionSpec<"stdc_count_zeros_ui", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedIntType>]>,
FunctionSpec<"stdc_count_zeros_ul", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongType>]>,
- FunctionSpec<"stdc_count_zeros_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>
+ FunctionSpec<"stdc_count_zeros_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>,
+ FunctionSpec<"stdc_count_ones_uc", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedCharType>]>,
+ FunctionSpec<"stdc_count_ones_us", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedShortType>]>,
+ FunctionSpec<"stdc_count_ones_ui", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedIntType>]>,
+ FunctionSpec<"stdc_count_ones_ul", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongType>]>,
+ FunctionSpec<"stdc_count_ones_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>
] // Functions
>;
diff --git a/libc/src/stdbit/CMakeLists.txt b/libc/src/stdbit/CMakeLists.txt
index a51ab5c21585ff..5fb77d21e57a13 100644
--- a/libc/src/stdbit/CMakeLists.txt
+++ b/libc/src/stdbit/CMakeLists.txt
@@ -8,6 +8,7 @@ set(prefixes
first_trailing_zero
first_trailing_one
count_zeros
+ count_ones
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/src/stdbit/stdc_count_ones_uc.cpp b/libc/src/stdbit/stdc_count_ones_uc.cpp
new file mode 100644
index 00000000000000..5a7314caa3baa0
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_uc.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_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_count_ones_uc.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_ones_uc, (unsigned char value)) {
+ return static_cast<unsigned>(cpp::count_ones(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_ones_uc.h b/libc/src/stdbit/stdc_count_ones_uc.h
new file mode 100644
index 00000000000000..eed3ee5f181b66
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_uc.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_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_COUNT_ONES_UC_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UC_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_ones_uc(unsigned char value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UC_H
diff --git a/libc/src/stdbit/stdc_count_ones_ui.cpp b/libc/src/stdbit/stdc_count_ones_ui.cpp
new file mode 100644
index 00000000000000..289f4bac31f7b8
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ui.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_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_count_ones_ui.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_ones_ui, (unsigned value)) {
+ return static_cast<unsigned>(cpp::count_ones(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_ones_ui.h b/libc/src/stdbit/stdc_count_ones_ui.h
new file mode 100644
index 00000000000000..1f7ccb9c502f64
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ui.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_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_COUNT_ONES_UI_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UI_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_ones_ui(unsigned value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UI_H
diff --git a/libc/src/stdbit/stdc_count_ones_ul.cpp b/libc/src/stdbit/stdc_count_ones_ul.cpp
new file mode 100644
index 00000000000000..83f3279d791937
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ul.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_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_count_ones_ul.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_ones_ul, (unsigned long value)) {
+ return static_cast<unsigned>(cpp::count_ones(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_ones_ul.h b/libc/src/stdbit/stdc_count_ones_ul.h
new file mode 100644
index 00000000000000..bde349a2fb94f2
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ul.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_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_COUNT_ONES_UL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_ones_ul(unsigned long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_UL_H
diff --git a/libc/src/stdbit/stdc_count_ones_ull.cpp b/libc/src/stdbit/stdc_count_ones_ull.cpp
new file mode 100644
index 00000000000000..104788aaf21265
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ull.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_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_count_ones_ull.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_ones_ull, (unsigned long long value)) {
+ return static_cast<unsigned>(cpp::count_ones(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_ones_ull.h b/libc/src/stdbit/stdc_count_ones_ull.h
new file mode 100644
index 00000000000000..830239f8874b08
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_ull.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_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_COUNT_ONES_ULL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_ULL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_ones_ull(unsigned long long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_ULL_H
diff --git a/libc/src/stdbit/stdc_count_ones_us.cpp b/libc/src/stdbit/stdc_count_ones_us.cpp
new file mode 100644
index 00000000000000..4b6ff0b94b626a
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_us.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_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_count_ones_us.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_ones_us, (unsigned short value)) {
+ return static_cast<unsigned>(cpp::count_ones(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_ones_us.h b/libc/src/stdbit/stdc_count_ones_us.h
new file mode 100644
index 00000000000000..08fd4e76eaae69
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_ones_us.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_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_COUNT_ONES_US_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_US_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_ones_us(unsigned short value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ONES_US_H
diff --git a/libc/test/include/stdbit_test.cpp b/libc/test/include/stdbit_test.cpp
index 44e4577d65e502..46019075a7c109 100644
--- a/libc/test/include/stdbit_test.cpp
+++ b/libc/test/include/stdbit_test.cpp
@@ -76,6 +76,11 @@ unsigned stdc_count_zeros_us(unsigned short) noexcept { return 0x2BU; }
unsigned stdc_count_zeros_ui(unsigned) noexcept { return 0x2CU; }
unsigned stdc_count_zeros_ul(unsigned long) noexcept { return 0x2DU; }
unsigned stdc_count_zeros_ull(unsigned long long) noexcept { return 0x2FU; }
+unsigned stdc_count_ones_uc(unsigned char) noexcept { return 0x3AU; }
+unsigned stdc_count_ones_us(unsigned short) noexcept { return 0x3BU; }
+unsigned stdc_count_ones_ui(unsigned) noexcept { return 0x3CU; }
+unsigned stdc_count_ones_ul(unsigned long) noexcept { return 0x3DU; }
+unsigned stdc_count_ones_ull(unsigned long long) noexcept { return 0x3FU; }
}
#include "include/llvm-libc-macros/stdbit-macros.h"
@@ -151,3 +156,11 @@ TEST(LlvmLibcStdbitTest, TypeGenericMacroCountZeros) {
EXPECT_EQ(stdc_count_zeros(0UL), 0x2DU);
EXPECT_EQ(stdc_count_zeros(0ULL), 0x2FU);
}
+
+TEST(LlvmLibcStdbitTest, TypeGenericMacroCountOnes) {
+ EXPECT_EQ(stdc_count_ones(static_cast<unsigned char>(0U)), 0x3AU);
+ EXPECT_EQ(stdc_count_ones(static_cast<unsigned short>(0U)), 0x3BU);
+ EXPECT_EQ(stdc_count_ones(0U), 0x3CU);
+ EXPECT_EQ(stdc_count_ones(0UL), 0x3DU);
+ EXPECT_EQ(stdc_count_ones(0ULL), 0x3FU);
+}
diff --git a/libc/test/src/stdbit/CMakeLists.txt b/libc/test/src/stdbit/CMakeLists.txt
index fafc26cae73444..659e575fedea27 100644
--- a/libc/test/src/stdbit/CMakeLists.txt
+++ b/libc/test/src/stdbit/CMakeLists.txt
@@ -10,6 +10,7 @@ set(prefixes
first_trailing_zero
first_trailing_one
count_zeros
+ count_ones
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/test/src/stdbit/stdc_count_ones_uc_test.cpp b/libc/test/src/stdbit/stdc_count_ones_uc_test.cpp
new file mode 100644
index 00000000000000..791288154bae79
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_ones_uc_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_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_count_ones_uc.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountOnesUcTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_uc(0U), 0U);
+}
+
+TEST(LlvmLibcStdcCountOnesUcTest, Ones) {
+ for (unsigned i = 0U; i != UCHAR_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_uc(UCHAR_MAX >> i),
+ UCHAR_WIDTH - i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_ones_ui_test.cpp b/libc/test/src/stdbit/stdc_count_ones_ui_test.cpp
new file mode 100644
index 00000000000000..198e3665842179
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_ones_ui_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_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_count_ones_ui.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountOnesUiTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ui(0), 0U);
+}
+
+TEST(LlvmLibcStdcCountOnesUiTest, Ones) {
+ for (unsigned i = 0U; i != UINT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ui(UINT_MAX >> i),
+ UINT_WIDTH - i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_ones_ul_test.cpp b/libc/test/src/stdbit/stdc_count_ones_ul_test.cpp
new file mode 100644
index 00000000000000..ce9d6eb081d41e
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_ones_ul_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_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_count_ones_ul.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountOnesUlTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ul(0UL), 0U);
+}
+
+TEST(LlvmLibcStdcCountOnesUlTest, Ones) {
+ for (unsigned i = 0U; i != ULONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ul(ULONG_MAX >> i),
+ ULONG_WIDTH - i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_ones_ull_test.cpp b/libc/test/src/stdbit/stdc_count_ones_ull_test.cpp
new file mode 100644
index 00000000000000..a0e69459c5a888
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_ones_ull_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_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_count_ones_ull.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountOnesUllTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ull(0ULL), 0U);
+}
+
+TEST(LlvmLibcStdcCountOnesUllTest, Ones) {
+ for (unsigned i = 0U; i != ULLONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_ull(ULLONG_MAX >> i),
+ ULLONG_WIDTH - i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_ones_us_test.cpp b/libc/test/src/stdbit/stdc_count_ones_us_test.cpp
new file mode 100644
index 00000000000000..19d3426062851d
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_ones_us_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_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_count_ones_us.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountOnesUiTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_us(0), 0U);
+}
+
+TEST(LlvmLibcStdcCountOnesUsTest, Ones) {
+ for (unsigned i = 0U; i != USHRT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_ones_us(USHRT_MAX >> i),
+ USHRT_WIDTH - i);
+}
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