[libc-commits] [libc] f70d5c0 - [libc][stdbit] implement stdc_count_zeros (C23) (#82437)
via libc-commits
libc-commits at lists.llvm.org
Mon Feb 26 09:23:20 PST 2024
Author: Nick Desaulniers
Date: 2024-02-26T09:23:15-08:00
New Revision: f70d5c0bc822f8932e8aadfbed7fe9c6cd8c3758
URL: https://github.com/llvm/llvm-project/commit/f70d5c0bc822f8932e8aadfbed7fe9c6cd8c3758
DIFF: https://github.com/llvm/llvm-project/commit/f70d5c0bc822f8932e8aadfbed7fe9c6cd8c3758.diff
LOG: [libc][stdbit] implement stdc_count_zeros (C23) (#82437)
Added:
libc/src/stdbit/stdc_count_zeros_uc.cpp
libc/src/stdbit/stdc_count_zeros_uc.h
libc/src/stdbit/stdc_count_zeros_ui.cpp
libc/src/stdbit/stdc_count_zeros_ui.h
libc/src/stdbit/stdc_count_zeros_ul.cpp
libc/src/stdbit/stdc_count_zeros_ul.h
libc/src/stdbit/stdc_count_zeros_ull.cpp
libc/src/stdbit/stdc_count_zeros_ull.h
libc/src/stdbit/stdc_count_zeros_us.cpp
libc/src/stdbit/stdc_count_zeros_us.h
libc/test/src/stdbit/stdc_count_zeros_uc_test.cpp
libc/test/src/stdbit/stdc_count_zeros_ui_test.cpp
libc/test/src/stdbit/stdc_count_zeros_ul_test.cpp
libc/test/src/stdbit/stdc_count_zeros_ull_test.cpp
libc/test/src/stdbit/stdc_count_zeros_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 beb7a5ed448ded..91e1bd73ec73fb 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -132,6 +132,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.stdbit.stdc_first_trailing_one_ui
libc.src.stdbit.stdc_first_trailing_one_ul
libc.src.stdbit.stdc_first_trailing_one_ull
+ libc.src.stdbit.stdc_count_zeros_uc
+ libc.src.stdbit.stdc_count_zeros_us
+ libc.src.stdbit.stdc_count_zeros_ui
+ libc.src.stdbit.stdc_count_zeros_ul
+ libc.src.stdbit.stdc_count_zeros_ull
# stdlib.h entrypoints
libc.src.stdlib.abs
diff --git a/libc/docs/stdbit.rst b/libc/docs/stdbit.rst
index 3bd83ff70c8924..3597cdc3432fd7 100644
--- a/libc/docs/stdbit.rst
+++ b/libc/docs/stdbit.rst
@@ -71,11 +71,11 @@ stdc_first_trailing_one_us |check|
stdc_first_trailing_one_ui |check|
stdc_first_trailing_one_ul |check|
stdc_first_trailing_one_ull |check|
-stdc_count_zeros_uc
-stdc_count_zeros_us
-stdc_count_zeros_ui
-stdc_count_zeros_ul
-stdc_count_zeros_ull
+stdc_count_zeros_uc |check|
+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
@@ -122,7 +122,7 @@ stdc_first_leading_zero |check|
stdc_first_leading_one |check|
stdc_first_trailing_zero |check|
stdc_first_trailing_one |check|
-stdc_count_zeros
+stdc_count_zeros |check|
stdc_count_ones
stdc_has_single_bit
stdc_bit_width
diff --git a/libc/include/llvm-libc-macros/stdbit-macros.h b/libc/include/llvm-libc-macros/stdbit-macros.h
index 0c97da96ebba29..3b2aa9b932b833 100644
--- a/libc/include/llvm-libc-macros/stdbit-macros.h
+++ b/libc/include/llvm-libc-macros/stdbit-macros.h
@@ -131,6 +131,19 @@ inline unsigned stdc_first_trailing_one(unsigned long x) {
inline unsigned stdc_first_trailing_one(unsigned long long x) {
return stdc_first_trailing_one_ull(x);
}
+inline unsigned stdc_count_zeros(unsigned char x) {
+ return stdc_count_zeros_uc(x);
+}
+inline unsigned stdc_count_zeros(unsigned short x) {
+ return stdc_count_zeros_us(x);
+}
+inline unsigned stdc_count_zeros(unsigned x) { return stdc_count_zeros_ui(x); }
+inline unsigned stdc_count_zeros(unsigned long x) {
+ return stdc_count_zeros_ul(x);
+}
+inline unsigned stdc_count_zeros(unsigned long long x) {
+ return stdc_count_zeros_ull(x);
+}
#else
#define stdc_leading_zeros(x) \
_Generic((x), \
@@ -188,6 +201,13 @@ inline unsigned stdc_first_trailing_one(unsigned long long x) {
unsigned: stdc_first_trailing_one_ui, \
unsigned long: stdc_first_trailing_one_ul, \
unsigned long long: stdc_first_trailing_one_ull)(x)
+#define stdc_count_zeros(x) \
+ _Generic((x), \
+ unsigned char: stdc_count_zeros_uc, \
+ unsigned short: stdc_count_zeros_us, \
+ unsigned: stdc_count_zeros_ui, \
+ unsigned long: stdc_count_zeros_ul, \
+ unsigned long long: stdc_count_zeros_ull)(x)
#endif // __cplusplus
#endif // __LLVM_LIBC_MACROS_STDBIT_MACROS_H
diff --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index 3fe19fae4c2e51..523a08c6a8c3cc 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -790,7 +790,8 @@ def StdC : StandardSpec<"stdc"> {
Macro<"stdc_first_leading_zero">,
Macro<"stdc_first_leading_one">,
Macro<"stdc_first_trailing_zero">,
- Macro<"stdc_first_trailing_one">
+ Macro<"stdc_first_trailing_one">,
+ Macro<"stdc_count_zeros">
], // Macros
[], // Types
[], // Enumerations
@@ -829,7 +830,12 @@ def StdC : StandardSpec<"stdc"> {
FunctionSpec<"stdc_first_trailing_one_us", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedShortType>]>,
FunctionSpec<"stdc_first_trailing_one_ui", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedIntType>]>,
FunctionSpec<"stdc_first_trailing_one_ul", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongType>]>,
- FunctionSpec<"stdc_first_trailing_one_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>
+ FunctionSpec<"stdc_first_trailing_one_ull", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedLongLongType>]>,
+ FunctionSpec<"stdc_count_zeros_uc", RetValSpec<UnsignedIntType>, [ArgSpec<UnsignedCharType>]>,
+ 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>]>
] // Functions
>;
diff --git a/libc/src/stdbit/CMakeLists.txt b/libc/src/stdbit/CMakeLists.txt
index 14cc26e206e0d3..a51ab5c21585ff 100644
--- a/libc/src/stdbit/CMakeLists.txt
+++ b/libc/src/stdbit/CMakeLists.txt
@@ -7,6 +7,7 @@ set(prefixes
first_leading_one
first_trailing_zero
first_trailing_one
+ count_zeros
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/src/stdbit/stdc_count_zeros_uc.cpp b/libc/src/stdbit/stdc_count_zeros_uc.cpp
new file mode 100644
index 00000000000000..22c57bd60c3846
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_uc.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_zeros_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_zeros_uc.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_zeros_uc, (unsigned char value)) {
+ return static_cast<unsigned>(cpp::count_zeros(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_zeros_uc.h b/libc/src/stdbit/stdc_count_zeros_uc.h
new file mode 100644
index 00000000000000..34b4636ee3f9e5
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_uc.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_zeros_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_ZEROS_UC_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UC_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_zeros_uc(unsigned char value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UC_H
diff --git a/libc/src/stdbit/stdc_count_zeros_ui.cpp b/libc/src/stdbit/stdc_count_zeros_ui.cpp
new file mode 100644
index 00000000000000..6a1defd9d555b2
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ui.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_zeros_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_zeros_ui.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_zeros_ui, (unsigned value)) {
+ return static_cast<unsigned>(cpp::count_zeros(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_zeros_ui.h b/libc/src/stdbit/stdc_count_zeros_ui.h
new file mode 100644
index 00000000000000..48e8630f6f0971
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ui.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_zeros_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_ZEROS_UI_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UI_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_zeros_ui(unsigned value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UI_H
diff --git a/libc/src/stdbit/stdc_count_zeros_ul.cpp b/libc/src/stdbit/stdc_count_zeros_ul.cpp
new file mode 100644
index 00000000000000..ceab32ef9ac36d
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ul.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_zeros_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_zeros_ul.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_zeros_ul, (unsigned long value)) {
+ return static_cast<unsigned>(cpp::count_zeros(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_zeros_ul.h b/libc/src/stdbit/stdc_count_zeros_ul.h
new file mode 100644
index 00000000000000..b88387741adefa
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ul.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_zeros_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_ZEROS_UL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_zeros_ul(unsigned long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_UL_H
diff --git a/libc/src/stdbit/stdc_count_zeros_ull.cpp b/libc/src/stdbit/stdc_count_zeros_ull.cpp
new file mode 100644
index 00000000000000..2f57f727a6919c
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ull.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_zeros_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_zeros_ull.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_zeros_ull, (unsigned long long value)) {
+ return static_cast<unsigned>(cpp::count_zeros(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_zeros_ull.h b/libc/src/stdbit/stdc_count_zeros_ull.h
new file mode 100644
index 00000000000000..e15b33011ab7f6
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_ull.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_zeros_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_ZEROS_ULL_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_ULL_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_zeros_ull(unsigned long long value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_ULL_H
diff --git a/libc/src/stdbit/stdc_count_zeros_us.cpp b/libc/src/stdbit/stdc_count_zeros_us.cpp
new file mode 100644
index 00000000000000..fc06836ee292a9
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_us.cpp
@@ -0,0 +1,20 @@
+//===-- Implementation of stdc_count_zeros_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_zeros_us.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(unsigned, stdc_count_zeros_us, (unsigned short value)) {
+ return static_cast<unsigned>(cpp::count_zeros(value));
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/stdbit/stdc_count_zeros_us.h b/libc/src/stdbit/stdc_count_zeros_us.h
new file mode 100644
index 00000000000000..d422377f076bc3
--- /dev/null
+++ b/libc/src/stdbit/stdc_count_zeros_us.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for stdc_count_zeros_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_ZEROS_US_H
+#define LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_US_H
+
+namespace LIBC_NAMESPACE {
+
+unsigned stdc_count_zeros_us(unsigned short value);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_STDBIT_STDC_COUNT_ZEROS_US_H
diff --git a/libc/test/include/stdbit_test.cpp b/libc/test/include/stdbit_test.cpp
index 22d5533df1e854..44e4577d65e502 100644
--- a/libc/test/include/stdbit_test.cpp
+++ b/libc/test/include/stdbit_test.cpp
@@ -71,6 +71,11 @@ unsigned stdc_first_trailing_one_ul(unsigned long) noexcept { return 0x1DU; }
unsigned stdc_first_trailing_one_ull(unsigned long long) noexcept {
return 0x1FU;
}
+unsigned stdc_count_zeros_uc(unsigned char) noexcept { return 0x2AU; }
+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; }
}
#include "include/llvm-libc-macros/stdbit-macros.h"
@@ -138,3 +143,11 @@ TEST(LlvmLibcStdbitTest, TypeGenericMacroFirstTrailingOne) {
EXPECT_EQ(stdc_first_trailing_one(0UL), 0x1DU);
EXPECT_EQ(stdc_first_trailing_one(0ULL), 0x1FU);
}
+
+TEST(LlvmLibcStdbitTest, TypeGenericMacroCountZeros) {
+ EXPECT_EQ(stdc_count_zeros(static_cast<unsigned char>(0U)), 0x2AU);
+ EXPECT_EQ(stdc_count_zeros(static_cast<unsigned short>(0U)), 0x2BU);
+ EXPECT_EQ(stdc_count_zeros(0U), 0x2CU);
+ EXPECT_EQ(stdc_count_zeros(0UL), 0x2DU);
+ EXPECT_EQ(stdc_count_zeros(0ULL), 0x2FU);
+}
diff --git a/libc/test/src/stdbit/CMakeLists.txt b/libc/test/src/stdbit/CMakeLists.txt
index 203f48bda99a44..fafc26cae73444 100644
--- a/libc/test/src/stdbit/CMakeLists.txt
+++ b/libc/test/src/stdbit/CMakeLists.txt
@@ -9,6 +9,7 @@ set(prefixes
first_leading_one
first_trailing_zero
first_trailing_one
+ count_zeros
)
set(suffixes c s i l ll)
foreach(prefix IN LISTS prefixes)
diff --git a/libc/test/src/stdbit/stdc_count_zeros_uc_test.cpp b/libc/test/src/stdbit/stdc_count_zeros_uc_test.cpp
new file mode 100644
index 00000000000000..3acf61aed637f2
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_zeros_uc_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_zeros_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_zeros_uc.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountZerosUcTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_uc(0U),
+ static_cast<unsigned>(UCHAR_WIDTH));
+}
+
+TEST(LlvmLibcStdcCountZerosUcTest, Ones) {
+ for (unsigned i = 0U; i != UCHAR_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_uc(UCHAR_MAX >> i), i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_zeros_ui_test.cpp b/libc/test/src/stdbit/stdc_count_zeros_ui_test.cpp
new file mode 100644
index 00000000000000..53ce1c86b40f67
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_zeros_ui_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_zeros_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_zeros_ui.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountZerosUiTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ui(0U),
+ static_cast<unsigned>(UINT_WIDTH));
+}
+
+TEST(LlvmLibcStdcCountZerosUiTest, Ones) {
+ for (unsigned i = 0U; i != UINT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ui(UINT_MAX >> i), i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_zeros_ul_test.cpp b/libc/test/src/stdbit/stdc_count_zeros_ul_test.cpp
new file mode 100644
index 00000000000000..60f01f3166573d
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_zeros_ul_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_zeros_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_zeros_ul.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountZerosUlTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ul(0U),
+ static_cast<unsigned>(ULONG_WIDTH));
+}
+
+TEST(LlvmLibcStdcCountZerosUlTest, Ones) {
+ for (unsigned i = 0U; i != ULONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ul(ULONG_MAX >> i), i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_zeros_ull_test.cpp b/libc/test/src/stdbit/stdc_count_zeros_ull_test.cpp
new file mode 100644
index 00000000000000..7da2493c0e8f75
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_zeros_ull_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_zeros_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_zeros_ull.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountZerosUllTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ull(0U),
+ static_cast<unsigned>(ULLONG_WIDTH));
+}
+
+TEST(LlvmLibcStdcCountZerosUllTest, Ones) {
+ for (unsigned i = 0U; i != ULLONG_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_ull(ULLONG_MAX >> i), i);
+}
diff --git a/libc/test/src/stdbit/stdc_count_zeros_us_test.cpp b/libc/test/src/stdbit/stdc_count_zeros_us_test.cpp
new file mode 100644
index 00000000000000..e8690cb989e3b5
--- /dev/null
+++ b/libc/test/src/stdbit/stdc_count_zeros_us_test.cpp
@@ -0,0 +1,21 @@
+//===-- Unittests for stdc_count_zeros_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_zeros_us.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcStdcCountZerosUsTest, Zero) {
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_us(0U),
+ static_cast<unsigned>(USHRT_WIDTH));
+}
+
+TEST(LlvmLibcStdcCountZerosUsTest, Ones) {
+ for (unsigned i = 0U; i != USHRT_WIDTH; ++i)
+ EXPECT_EQ(LIBC_NAMESPACE::stdc_count_zeros_us(USHRT_MAX >> i), i);
+}
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